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Sample records for program boydstown dam

  1. McNary Dam, Ice Harbor Dam, and Lower Monumental Dam Smolt Monitoring Program; 1996 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Hillson, Todd; Lind, Sharon; Price, William (Washington Department of Fish and Wildlife, Olympia, WA)

    1997-07-01

    The Washington Department of Fish & Wildlife (WDFW) assumed responsibility for the Smolt Monitoring Program at McNary Dam on the Columbia River in 1990 and at the new juvenile collection facility at Lower Monumental Dam on the Snake River in 1993. In 1996, Smolt Monitoring Program activities also began at the new juvenile collection facility located at Ice Harbor Dam. This report summarizes the 1996 Smolt Monitoring work at all three sites. The work at Ice Harbor consisted of Gas Bubble Trauma (GBT) monitoring only. In general, the 1996 passage season at both the McNary and Lower Monumental sites can be characterized by reduced passage of juveniles through the collection systems due to elevated river flows and spill, and low (<1%) overall facility mortality rates most likely resulting from cooler water temperatures. In accordance with the National Marine Fisheries Service recommendations (NMFS, 1995) all spring migrants were bypassed at McNary Dam in 1996. Mechanical problems within the McNary collection system resulted in collection and sampling activities being delayed until April 18 at this site, while sampling and collection began on the scheduled starting date of April 1 at Lower Monumental Dam. Monitoring operations were conducted through December 14 at McNary Dam and through October 28 at Lower Monumental Dam. An ongoing transportation evaluation summer migrant marking program was conducted at McNary Dam in 1996 by the NMFS. This necessitated the sampling of 394,211 additional fish beyond the recommended sampling guidelines. All total, 509,237 and 31,219 juvenile salmonids were anesthetized and individually counted, examined for scale loss, injuries, and brands by WDFW Smolt Monitoring personnel in 1996 at McNary Dam and Lower Monumental Dam, respectively.

  2. Dams

    Data.gov (United States)

    Vermont Center for Geographic Information — This dataset �is generated from from the Vermont Dam Inventory (VDI). The VDI is managed by the VT DEC's Dam Safety and Hydrology Section and contains information...

  3. National Program of Inspection of Non-Federal Dams.

    Science.gov (United States)

    1982-05-01

    inhabitants were informed by the media or local officials, the inspection program had little impact. When downstream residents were made fully aware of the... edad of A inet’ca ipt Coe~re aseiN , That the te rme ibts grs f ton. adagn" u used in thia Act means any artificial barrier, iiicludire *po is perit...performance, etc., for defining a comprehensive national dam safety program. (g) Responding to Congressional, media , scientific and engineering

  4. Surprise and opportunity for learning in Grand Canyon: the Glen Canyon Dam Adaptive Management Program

    Science.gov (United States)

    Melis, Theodore S.; Walters, Carl; Korman, Josh

    2015-01-01

    With a focus on resources of the Colorado River ecosystem below Glen Canyon Dam, the Glen Canyon Dam Adaptive Management Program has included a variety of experimental policy tests, ranging from manipulation of water releases from the dam to removal of non-native fish within Grand Canyon National Park. None of these field-scale experiments has yet produced unambiguous results in terms of management prescriptions. But there has been adaptive learning, mostly from unanticipated or surprising resource responses relative to predictions from ecosystem modeling. Surprise learning opportunities may often be viewed with dismay by some stakeholders who might not be clear about the purpose of science and modeling in adaptive management. However, the experimental results from the Glen Canyon Dam program actually represent scientific successes in terms of revealing new opportunities for developing better river management policies. A new long-term experimental management planning process for Glen Canyon Dam operations, started in 2011 by the U.S. Department of the Interior, provides an opportunity to refocus management objectives, identify and evaluate key uncertainties about the influence of dam releases, and refine monitoring for learning over the next several decades. Adaptive learning since 1995 is critical input to this long-term planning effort. Embracing uncertainty and surprise outcomes revealed by monitoring and ecosystem modeling will likely continue the advancement of resource objectives below the dam, and may also promote efficient learning in other complex programs.

  5. Surprise and Opportunity for Learning in Grand Canyon: the Glen Canyon Dam Adaptive Management Program

    Directory of Open Access Journals (Sweden)

    Theodore S. Melis

    2015-09-01

    Full Text Available With a focus on resources of the Colorado River ecosystem below Glen Canyon Dam, the Glen Canyon Dam Adaptive Management Program has included a variety of experimental policy tests, ranging from manipulation of water releases from the dam to removal of non-native fish within Grand Canyon National Park. None of these field-scale experiments has yet produced unambiguous results in terms of management prescriptions. But there has been adaptive learning, mostly from unanticipated or surprising resource responses relative to predictions from ecosystem modeling. Surprise learning opportunities may often be viewed with dismay by some stakeholders who might not be clear about the purpose of science and modeling in adaptive management. However, the experimental results from the Glen Canyon Dam program actually represent scientific successes in terms of revealing new opportunities for developing better river management policies. A new long-term experimental management planning process for Glen Canyon Dam operations, started in 2011 by the U.S. Department of the Interior, provides an opportunity to refocus management objectives, identify and evaluate key uncertainties about the influence of dam releases, and refine monitoring for learning over the next several decades. Adaptive learning since 1995 is critical input to this long-term planning effort. Embracing uncertainty and surprise outcomes revealed by monitoring and ecosystem modeling will likely continue the advancement of resource objectives below the dam, and may also promote efficient learning in other complex programs.

  6. Geotechnical advances in BC Hydro's Dam Safety Program

    Energy Technology Data Exchange (ETDEWEB)

    Lum, K.Y.; Garner, S.J. [BC Hydro, Burnaby, BC (Canada)

    2006-07-01

    BC Hydro operates 74 dams at 41 sites throughout British Columbia, providing hydroelectric power, domestic and irrigation water, recreational use and flood control to the province. Dam safety challenges in the fields of liquefaction, piping and risk assessment, have provided BC Hydro with the opportunity to participate and contribute to the development of geotechnical engineering practices in the local, national and international arenas. This paper discussed BC Hydro's contributions to the advancement of geotechnical engineering through its Dam Safety Program including the development of the Becker Penetration Test; liquefaction analyses; the remediation of earthfill dams; the understanding of piping and internal instability; the field of risk and uncertainty in dam safety; and, monitoring and assessing the performances of earthfill dams. Future challenges were also presented and discussed, with reference to the need to better understand and manage the potential ramifications of the recent trends in escalating earthquake criteria and continued improvements in managing internal erosion risks for dam safety. 43 refs., 8 figs.

  7. National Program for Inspection of Non-Federal Dams. Weston Reservoir Dam (MA 00798), Charles River Basin, Weston, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1980-02-01

    MASSACHUSETTS In’ In I- WESTON RESERVOIR DAM MA 00798 PHASE I INSPECTION REPORT NATIONAL DAM INSPECTION PROGRAM Copy avcailabl, to DTIC does nol Punk MIT...Vegetation on Slopes Heavy growth on d/s slope U/s slope mowed Sloughing or Erosion of Slopes or Abutments Slight undulations @d/s toe Rock Slope Protection...CONDITIONS OUTLET WORKS - SPILLWAY WEIR, APPROACH AND DISCHARGE CHANNELS a. Approach Channel Not Applicable General Condition Not Applicable Loose Rock

  8. Application of genetic programming in shape optimization of concrete gravity dams by metaheuristics

    Directory of Open Access Journals (Sweden)

    Abdolhossein Baghlani

    2014-12-01

    Full Text Available A gravity dam maintains its stability against the external loads by its massive size. Hence, minimization of the weight of the dam can remarkably reduce the construction costs. In this paper, a procedure for finding optimal shape of concrete gravity dams with a computationally efficient approach is introduced. Genetic programming (GP in conjunction with metaheuristics is used for this purpose. As a case study, shape optimization of the Bluestone dam is presented. Pseudo-dynamic analysis is carried out on a total number of 322 models in order to establish a database of the results. This database is then used to find appropriate relations based on GP for design criteria of the dam. This procedure eliminates the necessity of the time-consuming process of structural analyses in evolutionary optimization methods. The method is hybridized with three different metaheuristics, including particle swarm optimization, firefly algorithm (FA, and teaching–learning-based optimization, and a comparison is made. The results show that although all algorithms are very suitable, FA is slightly superior to other two algorithms in finding a lighter structure in less number of iterations. The proposed method reduces the weight of dam up to 14.6% with very low computational effort.

  9. 76 FR 584 - Glen Canyon Dam Adaptive Management Program Work Group (AMWG)

    Science.gov (United States)

    2011-01-05

    ... Bureau of Reclamation Glen Canyon Dam Adaptive Management Program Work Group (AMWG) AGENCY: Bureau of... Management Work Group (AMWG), a technical work group (TWG), a Grand Canyon Monitoring and Research Center.... Glen Knowles, Chief, Adaptive Management Work Group, Environmental Resources Division, Upper Colorado...

  10. National Dam Safety Program. Fairview Lake Dam (MO 10976), Missouri - Kansas City Basin. Boone County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1978-08-01

    Mr. Carl Hulen , the original owner, indicated that the dam was constructed during 1947-1948 by the Bill Goodson Construction Co. h. Normal Operating...available. 2.2 CONSTRUCTION The dam was constructed in 1947 and 1948 by the Bill Goods6n Construction Company. The original owner (Mr. Carl Hulen ) reported

  11. National Dam Inspection Program. Converse Lake Dam (CT 00044). Connecticut Coastal Basin, Greenwich, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1980-02-01

    Rosenstiel Estate. S-: f. Operator - Mr. Fredrick Jansen (Estate Superintendent) (203)661-9168 -’ .g. Purpose of Dam - Recreational - The dam was originally...cut from the downstream slope of the dam by Mr. Jansen , the estate superintendent. N 4.3 MAINTENANCE OF OPERATING FACILITIES ft There is no known...a bre in the blooi’pn.Ts cn o esosn ,71 ncut drainn theo lake or e;: v.atng7 oac C" t J C n o -2 alor A’J 1 Ian toWld that a considerable flow

  12. National Dam Safety Program. Hall Dam (MO 11038), Missouri - Nemaha - Nodaway Basin, Atchison County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1980-06-01

    entries for cataloging, conforming to standard terminology. The DoD "Thesaurus of Engineering and Scientific Terms" ( TEST ), AD-672 000, can be helpful...downstream from the dam through the center of Rockport to Rock Creek. 4ithin the damage zone are five dwell- ings, two commercial buildings and State...physical data are given in paragraph 1.3 below. b. Location. The dam is located in the west central portion of Atchison County just west of Rockport

  13. Phase I Inspection Report. National Dam Safety Program, Boonton Dam and Parsippany Dike, Morris County, New Jersey.

    Science.gov (United States)

    1978-05-01

    inspection for Boonton Dam, Parsippany Dike and reservoir, was conducted on April 14, 1978. The air temperature was about 50 F with partly cloudy skies...operating procedures, the gates are raised in the spring and lowered in the fall. e. Seismic Stability - The dam is located in the Triassic Highlands...physiographic subprovince of northern New Jersey and is founded on fine to medium grained, red sandstone and shale of the Triassic Newark Group

  14. National Dam Safety Program. Moore Dam, (Inventory Number VA 14323), Roanoke River Basin, Pittsylvania County, Virginia. Phase I Inspection Report.

    Science.gov (United States)

    1981-02-01

    and clear, with a temperature of 500F. Ground conditions were moist. The reservoir elevation was at 100 feet TBM. The principal spillway consists of a...8217 . SECTION 6 DAM STABILITY 6.1 Foundation and Abutments: The Moore Dam is located in an area underlain by sedimentary rocks of Triassic Age...within the "* Piedmont physiographic province. These Triassic sedimentary rocks include shales, sandstones, and conglomerates of continental origin. No

  15. National Dam Safety Program. Edmondson Dam (Inventory Number VA 19103), Tennessee River Basin, Washington County, Virginia, Phase I Inspection Report.

    Science.gov (United States)

    1980-07-01

    to the construction methods used for the dam. Large filler stone appears to 3-1 have been placed in the concrete . It is unknown whether this stone was... concrete structure and rock b. Rate of soluability of the limestone and dolomite. c. Rate of sinkhole development 7-1 d. Mapping of jointing and bedding...Stream: Middle Fork Holston River Date of Inspection: 5 June 1980 Edmondson Dam is a concrete gravity structure approximately 378 feet long and 47 feet

  16. The Glen Canyon Dam adaptive management program: progress and immediate challenges

    Science.gov (United States)

    Hamill, John F.; Melis, Theodore S.; Boon, Philip J.; Raven, Paul J.

    2012-01-01

    Adaptive management emerged as an important resource management strategy for major river systems in the United States (US) in the early 1990s. The Glen Canyon Dam Adaptive Management Program (‘the Program’) was formally established in 1997 to fulfill a statutory requirement in the 1992 Grand Canyon Protection Act (GCPA). The GCPA aimed to improve natural resource conditions in the Colorado River corridor in the Glen Canyon National Recreation Area and Grand Canyon National Park, Arizona that were affected by the Glen Canyon dam. The Program achieves this by using science and a variety of stakeholder perspectives to inform decisions about dam operations. Since the Program started the ecosystem is now much better understood and several biological and physical improvements have been achieved. These improvements include: (i) an estimated 50% increase in the adult population of endangered humpback chub (Gila cypha) between 2001 and 2008, following previous decline; (ii) a 90% decrease in non-native rainbow trout (Oncorhynchus mykiss), which are known to compete with and prey on native fish, as a result of removal experiments; and (iii) the widespread reappearance of sandbars in response to an experimental high-flow release of dam water in March 2008.Although substantial progress has been made, the Program faces several immediate challenges. These include: (i) defining specific, measurable objectives and desired future conditions for important natural, cultural and recreational attributes to inform science and management decisions; (ii) implementing structural and operational changes to improve collaboration among stakeholders; (iii) establishing a long-term experimental programme and management plan; and (iv) securing long-term funding for monitoring programmes to assess ecosystem and other responses to management actions. Addressing these challenges and building on recent progress will require strong and consistent leadership from the US Department of the Interior

  17. Rubber dam use: a survey of pediatric dentistry training programs and private practitioners.

    Science.gov (United States)

    Slawinski, David; Wilson, Stephen

    2010-01-01

    The benefits of the rubber dam (RD) are well known, but little data on utilization is available. This study's purpose was to evaluate the use of the rubber dam comparing survey responses of postgraduate pediatric dental residency program directors to privately practicing pediatric dentists. This prospective, Institutional Review Board-approved, survey-based study was sent to 75 current directors of pediatric dentistry postgraduate programs and a random sample of 200 practicing pediatric dentists identified through a computer-generated process. A 22-item survey was developed, pilot tested, and attached to an e-mail sent to the study sample. Surveys were posted and managed at: "www.surveymonkey.com". One hundred fifteen respondents completed the survey. Fifty-six (75%) were program directors, and 59 (30%) were private practitioners. Most respondents felt that the use of RD is considered a standard of care and was emphasized during training. More than 80% stated that they use the RD either always or frequently during daily practice. The most common factors for and against the use of RD were maintaining a dry field and patient anxieties and potential for painful stimulus, respectively. This study's results suggest that the use of rubber dams: (1) is considered a standard of care in pediatric dentistry; and (2) may be modified, depending on procedural and/or patient factors.

  18. Lower Granite Dam Smolt Monitoring Program, 1998 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Verhey, Peter; Ross, Doug; Morrill, Charles (Washington Department of Fish and Wildlife, Olympia, WA)

    1998-12-01

    The 1998 fish collection season at Lower Granite was characterized by relatively moderate spring flows and spill, moderate levels of debris, cool spring, warm summer and fall water temperatures, and increased chinook numbers, particularly wild subyearling chinook collected and transported. The Fish Passage Center's Smolt Monitoring Program is designed to provide a consistent, real-time database on fish passage and document the migrational characteristics of the many stocks of salmon and steelhead in the Columbia Basin.

  19. Lower Granite Dam Smolt Monitoring Program; 1997 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Verhey, Peter; Witalis, Shirley; Morrill, Charles (Washington Department of Fish and Wildlife, Olympia, WA)

    1998-01-01

    The 1997 fish collection season at Lower Granite was characterized by high spring flows, extensive spill, cool spring and early summer water temperatures and comparatively low numbers of fish, particularly yearling chinook. The Fish Passage Center's Smolt Monitoring Program is designed to provide a consistent, real-time database of fish passage and document the migrational characteristics of the many stocks of salmon and steelhead in the Columbia Basin.

  20. Human and organizational factors in implementing a security program for dams and powerhouses

    Energy Technology Data Exchange (ETDEWEB)

    Cattanach, D.; Stanley, P. [BC Hydro, Burnaby, BC (Canada)

    2009-07-01

    This paper discussed issues related to the implementation of a security program for dams and powerhouses owned by BC Hydro. The program was developed as a result of increased threats and acts of theft and vandalism involving the utility's assets. A system-wide security risk assessment was conducted before the development of a multi-year program designed to reduce security risk. The security program included policy and guideline development, implementation, monitoring, and response components. A security perimeter was defined for dam facilities in order to control access, detect, and assess unauthorized entries. Emergency response plans were also reviewed. The study demonstrated that organizational, human, and technical factors play a significant role in security breaches at generation sites. The program included a homes for gnomes program, in which a garden gnome was left at a critical asset as an indicator that the site had been successfully penetrated by personnel unknown to the site. The program is intended to ensure that generation facilities will benefit from safer and more secure working environments. 6 figs.

  1. National Dam Safety Program. Siegmund Lake Dam (MO-30520), Missouri - Kansas City Basin. Warren County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1981-06-01

    study as indicated in Section 5. Seepage and stability analyses comparable to the requirements of "Recommended Guidelines for Safety Inspection of Dams...lake outflow resulting from a storm of probable maximum flood magnitude, the recommended spillway design flood for this dam. In either case , the...ISTAQ ICOI’P IECON ITAPE JPT JPRTI IW( ISTAGE IAUTO INFLOW 0 0 0 0 0 1 0 0 HYDROGIdAP DATA IIYDG ILi4G TREA SA TRSDA TRSPC RATIO I S" ISAME LOCX. 1 2

  2. Surprise and Opportunity for Learning in Grand Canyon: the Glen Canyon Dam Adaptive Management Program

    Science.gov (United States)

    Melis, T. S.; Walters, C. J.; Korman, J.

    2013-12-01

    With a focus on resources of the Colorado River ecosystem downstream of Glen Canyon Dam in Glen Canyon National Recreation Area (GCNRA) and Grand Canyon National Park (GCNP) of northern Arizona, the Glen Canyon Dam Adaptive Management Program has evaluated experimental flow and nonflow policy tests since 1990. Flow experiments have consisted of a variety of water releases from the dam within pre-existing annual downstream delivery agreements. The daily experimental dam operation, termed the Modified Low Fluctuating Flow (MLFF), implemented in 1996 to increase daily low flows and decrease daily peaks were intended to limit daily flow range to conserve tributary sand inputs and improve navigation among other objectives, including hydropower energy. Other flow tests have included controlled floods with some larger releases bypassing the dam's hydropower plant to rebuild and maintain eroded sandbars in GCNP. Experimental daily hydropeaking tests beyond MLFF have also been evaluated for managing the exotic recreational rainbow trout fishery in the dam's GCNRA tailwater. Experimental nonflow policies, such as physical removal of exotic fish below the tailwater, and experimental translocation of endangered native humpback chub from spawning habitats in the Little Colorado River (the largest natal origin site for chub in the basin) to other tributaries within GCNP have also been monitored. None of these large-scale field experiments has yet produced unambiguous results in terms of management prescriptions, owing to inadequate monitoring programs and confounding of treatment effects with effects of ongoing natural changes; most notably, a persistent warming of the river resulting from reduced storage in the dam's reservoir after 2003. But there have been several surprising results relative to predictions from models developed to identify monitoring needs and evaluate experimental design options at the start of the adaptive ecosystem assessment and management program in 1997

  3. National Dam Safety Program. Lake Winnebago Dam (MO 20312), Missouri - Kansas City Basin, Cass County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1979-05-01

    of maximum pool - 12.000 feet * (2) Length of normal pool - 10,100 feet + 3 e Storage (Acre- teet ) ti) Top of dam - 7,150 1) LiEergency spillway crest...stream banks are covered with brush and trees. 3.2 EVALUATION The riprap should be maintained on the upstream slope in order to remain adequate. Cutting...of the grass and brush on the embankment should be continued. The seepage does not appear likely to become a problem. The erosion may be a problem in

  4. DAM Safety and Deformation Monitoring in Dams

    Science.gov (United States)

    Kalkan, Y.; Bilgi, S.; Potts, L.; Miiama, J.; Mahgoub, M.; Rahman, S.

    2013-12-01

    Water is the life and necessity to water is increasing day by day with respect to the World population, rising of living standards and destruction of nature. Thus, the importance of water and water structures have been increasing gradually. Dams are among the most important engineering structures used for water supplies, flood controls, agricultural purposes as well as drinking and hydroelectric power. There are about 150.000 large size dams in the World. Especially after the Second World War, higher and larger capacity dams have been constructed. Dams create certain risks like the other manmade structures. No one knows precisely how many dam failures have occurred in the World, whereas hundreds of dam failures have occurred throughout the U.S. history. Some basic physical data are very important for assessing the safety and performance of dams. These are movement, water pressure, seepage, reservoir and tail-water elevations, local seismic activities, total pressure, stress and strain, internal concrete temperature, ambient temperature and precipitation. These physical data are measured and monitored by the instruments and equipment. Dams and their surroundings have to be monitored by using essential methods at periodic time intervals in order to determine the possible changes that may occur over the time. Monitoring programs typically consist of; surveillance or visual observation. These programs on dams provide information for evaluating the dam's performance related to the design intent and expected changes that could affect the safety performance of the dam. Additionally, these programs are used for investigating and evaluating the abnormal or degrading performance where any remedial action is necessary. Geodetic and non-geodetic methods are used for monitoring. Monitoring the performance of the dams is critical for producing and maintaining the safe dams. This study provides some information, safety and the techniques about the deformation monitoring of the

  5. Libby Mitigation Program, 2007 Annual Progress Report: Mitigation for the Construction and Operation of Libby Dam.

    Energy Technology Data Exchange (ETDEWEB)

    Dunnigan, James; DeShazer, J.; Garrow, L.

    2009-05-26

    Libby Reservoir was created under an International Columbia River Treaty between the United States and Canada for cooperative water development of the Columbia River Basin (Columbia River Treaty 1964). Libby Reservoir inundated 109 stream miles of the mainstem Kootenai River in the United States and Canada, and 40 miles of tributary streams in the U.S. that provided habitat for spawning, juvenile rearing, and migratory passage (Figure 1). The authorized purpose of the dam is to provide power (91.5%), flood control (8.3%), and navigation and other benefits (0.2%; Storm et al. 1982). The Pacific Northwest Power Act of 1980 recognized possible conflicts stemming from hydroelectric projects in the northwest and directed Bonneville Power Administration to 'protect, mitigate, and enhance fish and wildlife to the extent affected by the development and operation of any hydroelectric project of the Columbia River and its tributaries' (4(h)(10)(A)). Under the Act, the Northwest Power Planning Council was created and recommendations for a comprehensive fish and wildlife program were solicited from the region's federal, state, and tribal fish and wildlife agencies. Among Montana's recommendations was the proposal that research be initiated to quantify acceptable seasonal minimum pool elevations to maintain or enhance the existing fisheries (Graham et al. 1982). Research to determine how operations of Libby Dam affect the reservoir and river fishery and to suggest ways to lessen these effects began in May 1983. The framework for the Libby Reservoir Model (LRMOD) was completed in 1989. Development of Integrated Rule Curves (IRCs) for Libby Dam operation was completed in 1996 (Marotz et al. 1996). The Libby Reservoir Model and the IRCs continue to be refined (Marotz et al 1999). Initiation of mitigation projects such as lake rehabilitation and stream restoration began in 1996. The primary focus of the Libby Mitigation project now is to restore the fisheries

  6. National Dam Safety Program. Perdido Dam (MO 31042), White River Basin, Reynolds County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1979-01-01

    The riprap on the upstream embankment slope is providing excellent protection for the embankment material. No degradation due to weathering of the...10 .00 .L \\ >S,*. It E toz I~~~~o 1 @~N0 OPV LOCATEO MAP IPERDIDO DAM REYNOLDS COUNTY, MISSOURI -J U L0 0 u z 0 0 0 Ki > (n t -j uI-- wL- kLu wi...Rf S/O;A’ea~- /it6RF_- uv F4k1.rhnw P-OR /40 Y4f.R F4vvoO F-ee /R19, 5, Kj - - ~//-77 ~ ./6t,. Y~O S7 cF5 ........ V . I

  7. National Program of Inspection of Dams. Volume 5. Appendix F. Inventory of Dams in the United States. Section IV. Index

    Science.gov (United States)

    1975-05-01

    Hampshire, New Jersey, New Mexico , New York, North Carolina, North Dakota and Ohio IV Appendix F, Inventory of Dams in the United States Section III...c*e e e .. A * * ec e c .cA4 AA 4cAA g 44 . .c-9W 4A 9 9 .1 W 4ce ftAec44ZW q 1 4 4 wA K 1/1 ececs .., cc.* zc Segeececc cc e zgeee zg* CCO *ec...e...mo ecec =e e . .2. Ic mmm ;A -4.g.A ;gee - tm.. = Yee -m.. *tj c * X e W. Lw .. 0em Zmeme ýý Zccc.C..; .-le .ýj -1 Weg,~~~~~~~ mem w it cm Xee we . el

  8. National Dam Safety Program. West Millpond Dam (NY 01060), Mohawk River Basin, City of Gloversville, Fulton County, New York. Phase I Inspection Report,

    Science.gov (United States)

    1981-09-02

    left of the spillway (a portion of this building ex- tends over the downstream channel about 50 feet from the dam); several tannery buildings located...stream about 800 feet from the dam. Further downstream from the dam the stream flows through residential and industrial areas of the City of Gloversville

  9. National Program for Inspection of Non-Federal Dams. Bethlehem Dam (NH 00279), Connecticut River Basin, Bethlehem, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1979-04-01

    changing internal and external conditions, and is evolutionary in nature. It would be incorrect to assume that the present condition of the dam will...the dam. 4. The construction of a new wastegate on the right end of the dam. 5. The setting of all iron work, gate frames, anchor bolts, etc...Length ........................................ Turbines Number ....................... : Makers . . .- ..................... Rating HP. per

  10. Dams designed to fail

    Energy Technology Data Exchange (ETDEWEB)

    Penman, A. [Geotechnical Engineering Consultants, Harpenden (United Kingdom)

    2004-09-01

    New developments in geotechnical engineering have led to methods for designing and constructing safe embankment dams. Failed dams can be categorized as those designed to fail, and those that have failed unexpectedly. This presentation outlined 3 dam failures: the 61 m high Malpasset Dam in France in 1959 which killed 421; the 71 m high Baldwin Hills Dam in the United States in 1963 which killed 5; and, the Vajont Dam in Italy in 1963 which killed 2,600 people. Following these incidents, the International Commission for Large Dams (ICOLD) reviewed regulations on reservoir safety. The 3 dams were found to have inadequate spillways and their failures were due to faults in their design. Fuse plug spillways, which address this problem, are designed to fail if an existing spillway proves inadequate. They allow additional discharge to prevent overtopping of the embankment dam. This solution can only be used if there is an adjacent valley to take the additional discharge. Examples of fuse gates were presented along with their effect on dam safety. A research program is currently underway in Norway in which high embankment dams are being studied for overtopping failure and failure due to internal erosion. Internal erosion has been the main reason why dams have failed unexpectedly. To prevent failures, designers suggested the use of a clay blanket placed under the upstream shoulder. However, for dams with soft clay cores, these underblankets could provide a route for a slip surface and that could lead to failure of the upstream shoulder. It was concluded that a safe arrangement for embankment dams includes the use of tipping gates or overturning gates which always fail at a required flood water level. Many have been installed in old and new dams around the world. 14 refs., 19 figs.

  11. 33 CFR 222.6 - National Program for Inspection of Non-Federal Dams.

    Science.gov (United States)

    2010-07-01

    ... D to this section). Expanded Guidance for Hydrologic and Hydraulic Assessment of Dams is provided in.... U.S. Department of Energy Federal Energy Regulatory Commission DOE FERC d. Tennessee Valley...—Hydrologic and Hydraulic Assessment of Dams 1. Phase I inspections are not intended to provide detailed...

  12. National Program for Inspection of Non-Federal Dams. Avery Dam (NH 00465), NHWRB 130.02, Merrimack River Basin, Laconia, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1978-11-01

    Winnipesaukee River, is used to con- trol the level of Opechee Bay as the discharge from Lake Winni- pesaukee through the upstream Lakeport Dam varies. The 374...i s square mile drainage area of gently to steeply sloping forest includes the 363 square mile Lake Winnipesaukee drainage area. The dam’s maximum...discharge from Lake Winnipesaukee through the upstream dam at Lakeport varies with the weather and channel conditions. (h) Design and Construction History

  13. National Program for Inspection of Non-Federal Dams. Lochmere Dam (NH 00015), NHWRB 21.07, Merrimack River Basin, Belmont, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1978-11-01

    con- figuration in 1976. . The dam, which lies on the Winnipesaukee River and impounds Lake Winnisquam, is used primarily to maintain the lake for...islands . - in Lake Winnipesaukee . (b) Discharge at Dam Site (1) Outlet Works The outlet works at the dam consist of the six 4 feet, 1 inch wide by 2...above the narrow channel outflow of Lake Winnipesaukee at the Weirs. The surface area of Lake Winnipesaukee is 76 square miles and thus represents 22

  14. National Program for Inspection of Non-Federal Dams. Lake Kanasatka Dam (NH 00125) Merrimack River Basin, Moultonboro, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1980-03-01

    DAMS, INSPECTION, DAM SAFETY, Merrimack River Basin Moultonboro, New Hampshire Tributary to Lake Winnipesaukee 20. ABSTRACT (Conaiw,.en aeveta...Blackey ,ve portion of Lake Winnipesaukee . The elevation difference ttween the normal water surfaces of Lake Kanasatka and Lke Winnipesaukee is...approximately 1,800 ft. downstream of the dam on the shore of Lake Winnipesaukee . Although the homes are located on the fringe of the impact area, one

  15. National Program for Inspection of Non-Federal Dams. Miller Pond Dam (CT 00154), Thames River Basin, Waterford, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1980-08-01

    SHEET AND RETURN TO DTIC-DDA-2 0 FORM DOCUMENT PROCESSING SHEET DTIC OCT 79 70A . U U U U U U U U U U U U • 0 THAMES NMVU SAN WATERFORD , CONNECTICUT MLLER...WALTHAM. MASS. 02154 .1 AUGUST 1980 THAMES RIVER BASIN WATERFORD , CONNECTICUT MILLER POND DAM 00154 PHASE I INSPECTION REPORT NATIONAL DAM INSPECTION...Conlue on reverse side it necesary and identfyll by &Joc nmiber) 0 DAMS, INSPECTION, DAM SAFETY, Thames River Basin Waterford , Conn. 20. ABSTRACT

  16. Lower Granite Dam Smolt Monitoring Program, Annual Report 2005-2006.

    Energy Technology Data Exchange (ETDEWEB)

    Menski, Fred

    2007-01-01

    The 2005 fish collection season at Lower Granite Dam (LGR) was characterized by average water temperatures, below average flows, above average spill, low levels of debris and the record number of smolts collected compared to the previous five years. With the continued release of unclipped supplementation chinook and steelhead above LGR, we cannot accurately distinguish wild chinook, steelhead, and sockeye/kokanee in the sample. For the purposes of this report we will designate fish as clipped and unclipped. This season a total of 13,030,967 juvenile salmonids were collected at LGR. Of these, 12,099,019 were transported to release sites below Bonneville Dam, 12,032,623 by barge and 66,396 by truck. An additional 898,235 fish were bypassed to the river due to over-capacity of the raceways, barges or trucks and for research purposes. This was the first season of summer spill at LGR. Spill was initiated at 12:01am June 20 as directed by the ruling set forth by Judge James Redden of the United States District Court (Order CV 01-640-RE). In addition, the Lower Granite project also conducted a summer spill test alternating spill and spill patterns between spill to the gas cap without the removable spillway weir (RSW) and spill with up to 20 kcfs utilizing the RSW. Because of the forecast low flow this year, most hatchery reared subyearling fall chinook were released up to three weeks early. With the unexpected high flows in late May and early June, more than 90% of the subyearling chinook were collected prior to the initiation of the court ordered summer spill program. Collection number fluctuations reflect river flow and project operations for any given year. For example, low flow years (2001, 2004 and 2005) result in higher collection numbers. Court ordered spill throughout the summer migration will directly affect collection of fall subyearling chinook collection numbers. The editors of this report urge the reader to use caution when comparing fish collection numbers

  17. Lower Granite Dam Smolt Monitoring Program, 2005-2006 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Mensik, Fred; Rapp, Shawn; Ross, Doug (Washington Department of Fish and Wildlife, Olympia, WA)

    2007-01-01

    The 2005 fish collection season at Lower Granite Dam (LGR) was characterized by average water temperatures, below average flows, above average spill, low levels of debris and the record number of smolts collected compared to the previous five years. With the continued release of unclipped supplementation chinook and steelhead above LGR, we cannot accurately distinguish wild chinook, steelhead, and sockeye/kokanee in the sample. For the purposes of this report we will designate fish as clipped and unclipped. This season a total of 13,030,967 juvenile salmonids were collected at LGR. Of these, 12,099,019 were transported to release sites below Bonneville Dam, 12,032,623 by barge and 66,396 by truck. An additional 898,235 fish were bypassed to the river due to over-capacity of the raceways, barges or trucks and for research purposes. This was the first season of summer spill at LGR. Spill was initiated at 12:01am June 20 as directed by the ruling set forth by Judge James Redden of the United States District Court (Order CV 01-640-RE). In addition, the Lower Granite project also conducted a summer spill test alternating spill and spill patterns between spill to the gas cap without the removable spillway weir (RSW) and spill with up to 20 kcfs utilizing the RSW. Because of the forecast low flow this year, most hatchery reared subyearling fall chinook were released up to three weeks early. With the unexpected high flows in late May and early June, more than 90% of the subyearling chinook were collected prior to the initiation of the court ordered summer spill program. Collection number fluctuations reflect river flow and project operations for any given year. For example, low flow years (2001, 2004 and 2005) result in higher collection numbers. Court ordered spill throughout the summer migration will directly affect collection of fall subyearling chinook collection numbers. The editors of this report urge the reader to use caution when comparing fish collection numbers

  18. National Program for Inspection of Non-Federal Dams. Silver Lake Dam (MA 00066), Connecticut River Basin, Springfield, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1978-10-01

    information supplied by Mr. Lowell, the present owner of this dam is Mr. Kenneth Henshaw, Gunnland Ranch, Goldendale , Washington, sip code 98620 , His legal...According to information supplied by Mr. Lowell, the present owner of this dam is Mr. Kenneth Henshaw, Gunnland Ranch, Goldendale , Washington, tip code

  19. National Program for Inspection of Non-Federal Dams. Reservoir Dam (ME 00472), Kennebec River Basin, Waterville, Maine. Phase I Inspection Report.

    Science.gov (United States)

    1981-09-01

    into the reservoir. Probably the result of rainwater , this pool is not a serious problem at present. (See Section 7) e. Downstream Channel There is a...Dam is diverted around the reservoir. The dam is located approximately two miles above the town of Waterville Maine. The catchment area of the reservoir

  20. National Program for Inspection of Non-Federal Dam. Spoonwood Pond Dam (NH 00338), NHWRB 116.03, Merrimack River Basin, Nelson, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1978-08-01

    Nubanusit gatehouse contains the operating key for the gate valve. - 4.2 Maintenance of Dam The owner visits the dam several times during the year and notes...In essence, removal of the tre(s and roots would require a virtual rebuilding of the entire darn. Thc suffici(ncy of * merely cutting the trees down

  1. National Dam Safety Program. Lake Anne Dam (Inventory Number VA 05909), Potomac River Basin, Fairfax County, Virginia. Phase I Inspection Report.

    Science.gov (United States)

    1980-07-01

    left2 abutment. Wiehle Avenue, a four-lane highway, runs along the crest of the dam. A macadam path runs along the berm on the upstream slope...adequate cover of grass. NAME OF DAM: LAKE ANNE DAM 13 The junctions of the embankment and abutments are composed of vegetated earth. There is grouted ...rprap to El 327 where the Macadam path is located, it actually appears that the top of riprap is about 2 feet below the surface of the path (See Photo

  2. National Dam Safety Program. Gwenmil Lake Dam (MO 31210), Upper Mississippi - Kaskaskia - St. Louis, Basin, Jefferson County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1981-04-01

    NUMBER 2. GOVT ACCESSION NO 3. RECIPIENT’S CATALOG NUMBER 4. TITLE (aod Subtitle) -T "yPE OF REA.z & BERIOD COVEREO Phase I Dam Inspection Report...magnitude of the spillway design flu-1 for the Gwenmil Lake Dam, which, according to Table 1 of the guidelines, is clissified as small in size; is...specified, according to Table 3 of the quideliines for a dam of significant hazard potential and small size, to be a minimum of the 100-year frequency flood

  3. National Program for Inspection of Non-Federal Dams. Stony Brook Reservoir Dam MA 00293, Charles River Basin, Weston, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1979-06-01

    the dam along the west side of the reservoir. Water supply intakes and a low flow outlet are controlled from the gatehouse near the right end of the dam...face of the dam, the establishment of vegetation on bare areas, the repointing of joints at the spillway and gatehouse , the repair of an inoperative...Stony Brook Reservoir. The routing indicated that there is virtually no reduction of the peak inflow rate of 8,400 cfs into Stony Brook Reservoir and as a

  4. National Program for Inspection of Non-Federal Dams. Parks Pond Dam (CT 00071), Housatonic River Basin, Danbury, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1980-07-01

    dam is classified as small (height less than 40 teet and storage less than 1,000 acre-feet). d. Hazard Classification - Parks Pond Dam is classified as...with a 2:1 slope. It is well vegetated with grass, brush and trees (Photos 1, 2 and 3). Along the toe of the dam, there are trees and brush which...natural channel (Photo 4). Just below the spillway, brush and debris has accumulated (Photo 3). d. Reservoir Area - The area immediately adjacent to the

  5. Strategies of Voshmgir Dam Water Allocation Using Two-Stage Stochastic Programming

    Directory of Open Access Journals (Sweden)

    elham kalbali

    2017-03-01

    Full Text Available Introduction: In the present study, dealing with water deficit challenges for Gorgan River Basin has been considered. Golestan province's economy is dependent on agriculture but the occurrence of drought periods reduced the agricultural production and consequently the region's economy is in crisis. Therefore, performing studies for programming and management of the water resources of the province and the water allocation in the margin of Voshmgir dam in Gorganrood basin has a great deal of importance. The issue of the allocation of water resources is proposed in order to maximize the expected profit of the water system. According to the regional water organization policy, one of the main goals of Voshmgir dam water management is the allocation of water between the competing consumers. If the amount of promised water is released in the future, the expected net profit of the system will be realized and if it is not released, the system will experience losses. Materials and Methods: In this studyWater supply is considered stochasticand objective function of the model is to maximize the system (Agriculture, Aquaculture and Environment profit and optimal allocation of water during the programming period using a two-stage stochastic model as follows: Constraint of the available land: Constraint of the available water in each of the main canals: Constraint of the available water: Constraint of the amount of inflow water Reservoir capacity constraint Constraint on the maximum and minimum water demand for environmental sector Constraint on the maximum and minimum water demand for crops Constraint on the maximum and minimum water demand for warm-water fish Constraint on non-negativity of the decision variables in the model Results and Discussion: The length of the right main canal of this network is about 17.76 km and the length of the left main canal is about 21.338 km. In this study, is considered for the right main canal and is considered for left main

  6. National Program for Inspection of Non-Federal Dams. Curran Upper Reservoir Dam (RI 00702), Pawtuxet River Basin, Cranston, Rhode Island. Phase I Inspection Report.

    Science.gov (United States)

    1980-03-01

    pool dam is equal to 9 feet. This failure discharge will cause flooding, high velo - cities, and carry large quantities of debris from the wooded...RETAIN 2OO,o0o,0o GALA . Of WATER FOR PAruUXET VALLEY WATER COMPANY. WELL BUILT EARTH DAM VIZN rJLL R IPRAPPEC SLOPE ON pOND SIDE AND GRASSED SLOPES ON

  7. National Dam Safety Program. Penwell Mill Dam (NJ 00781). Delaware River Basin, Musconetong River. Hunterdon County, New Jersey. Phase I Inspection Report.

    Science.gov (United States)

    1981-05-01

    AP ATE A, Scale i n Miles (Approx.) VICINITY MAP PLATE 2 9 N qfb . gh // Ojb / 40-46’ gpx 0- PENWELL ROAD PENWELL MILL DAM 0 I 2I I * I I I Scale:I"= I...Cambrian gh Hornblende Granite gpx Pyroxene Gneiss qfb Quartz- Feldspar-Biotite Gneiss FAULT (Dashed Where Inferred) GEOLOGIC MAP PENWELL MILL DAM PLATE 3

  8. National Program for Inspection of Non-Federal Dams. Meredith Reservoir Dam (NH 00308), Merrimack River Basin, Meredith, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1979-04-01

    the Town’s water supply system. Water is pumped to the reservoir from Lake Waukewan and let down to the supply system only during emergency conditions...and is in the Merrimack- Winnipesaukee basin. S S b. Description of Dam and Appurtenances Meredith Reservoir Dam is an earth fill darn, approximately...purposes. Water is pumped from Lake Waukewan, stored in the reservoir and used as needed in . - emergency situations. Because of the limited drainage

  9. National Program for Inspection of Non-Federal Dams. Alton Power Dam (NH 00011), Merrimack River Basin, Alton, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1980-01-01

    mile to Alton Bay at the southern end of Lake Winnipesaukee . b. Description of Dam and Appurtenances. Alton Power Dam consistsof a concrete gravity...Merrymeeting River to Lake Winnipesaukee , approximately one mile 8) General ...................... Spillway crest approx. i ft. above...the southern end of Lake Winnipesaukee . Stone has been placed imediately downstream of the spillway apron and stone exists on the banks and in tChe

  10. National Program for Inspection of Non-Federal Dams. MaCallen Dam (NH 00365), New Hampshire Coastal Basin, Newmarket, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1980-03-01

    depends on numerous and constantly changing internal and external conditions, and is evolutionary in nature. It would be incorrect to assume that the...water at top of dam and all wastegates open. The spillway capacity at top of dam (excluding capacity of waste gates) is 3,600 cfs or about 50 percent of...Length.............................................................. Turbines 1-110-ney :.j=nt 1 Rod, Hnn7t tw

  11. National Program for Inspection of Non-Federal Dams. Silver Lake Dam (ME 00147) Penobscot River Basin, Bucksport, Maine. Phase I Inspection Report.

    Science.gov (United States)

    1978-10-01

    Inspection of Non-Federal Dams; use cover date for date of report. I9. KEY WORDS (Coninue on reere oll. fi noceemy and islonfil by & lech ... st) DAMS...the charnel was choked with vegetative growth (trees, shrubs) which constrict the waterway, thus reducing its design discharge capabilities. The first...soil, vegetation and rubble. (3) The steel bulkheads were in good condition with only minor 6 0 leakage from a 2.5 foot head (see Photo No. 10). The stop

  12. National Program for Inspection of Non-Federal Dams. Notch Reservoir Dam (MA 00283), Hoosic River Basin, North Adams, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1979-06-01

    the replacing of missing mortar atthe spillway, the patching of concrete at the overflow structure and minor items of repair at the outlet gatehouse ...b. Design and Construction Data - The drawings obtained from the City Engineer show the basic cross-section of the dam. However, there is virtually ...7.7T The gatehouse at the toe of the dam is generally in good condition. The interior of the structure requires maintenance in the form of replacing

  13. National Program for Inspection of Non-Federal Dams. Georgiaville Pond Dam (RI 03108), Woonasquatucket River Basin, Smithfield, Rhode Island. Phase I Inspection Report.

    Science.gov (United States)

    1979-04-01

    in a gatehouse structure. e. Test Flood Analysis. Recommended guidelines for the Safety Inspection of Dams by the Corps of Engineers were used for...going over the spillway was flowing in virtually every direction on land below the dam on the easterly side of the river. A considerable - amount of...covered * by trees ardbrush and virtually inaccessible. The - ground is for the most part very wet, which coendition is largely due to the flow from tha

  14. Grand Coulee Dam Wildlife Mitigation Program : Pygmy Rabbit Programmatic Management Plan, Douglas County, Washington.

    Energy Technology Data Exchange (ETDEWEB)

    Ashley, Paul

    1992-06-01

    The Northwest Power Planning Council and the Bonneville Power Administration approved the pygmy rabbit project as partial mitigation for impacts caused by the construction of Grand Coulee Dam. The focus of this project is the protection and enhancement of shrub-steppe/pygmy rabbit habitat in northeastern Washington.

  15. Lower Granite Dam Smolt Monitoring Program, 2003-2004 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Mensik, Fred; Rapp, Shawn; Ross, Doug

    2004-08-01

    The 2003 fish collection season at Lower Granite Dam Juvenile Fish Facility (LGR) was characterized by water temperatures, total flows and spill that were below the five year average, low levels of debris, and increased smolt collection numbers compared to 2002 with the exception of unclipped sockeye/kokanee. There were 6,183,825 juvenile salmonids collected. Of these, 6,054,167 were transported to release sites below Bonneville Dam, 5,957,885 by barge and 96,282 by truck. An additional 102,340 fish were bypassed back to the river, primarily due to research projects with another 62,122 bypassed through the PIT-tag bypass system. According to the PTAGIS database, 152,268 PIT-tagged fish were detected at Lower Granite Dam. Of these, Smolt Monitoring Staff recorded 345 PIT-tagged raceway and sample mortalities. Of the 6,183,825 total fish collected, 113,290 were PIT-tagged or radio tagged and 380 were sacrificed by researchers. The collection included 836,885 fish that had hatchery marks other than clipped fins (elastomer, freeze brands or Coded Wire Tags). An estimated 54,857 incidental fish were collected with an additional 8,730 adult salmonids removed from the separator.

  16. National Program for Inspection of Non-Federal Dams. Farm Brook Site 2B Dam (CT 01547), Connecticut Coastal Basin, Hamden, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1981-09-01

    OVERVIEW PHOTO OF DAM FARM BROOK SITE 2B DAM HAMDEN, CONNECTICUT ORf S ECKED SY 1APND WA NiMONE T. I Uaw. LI. DATE WK, N sHEr I -tI V.. J\\//FARM...lo. oc 100.0 lop C?0, 101"o 117- 0 liz.. (02.0 115 0 l; *105.0 117 C~30 7 /17 104,0 170 Hsw 1500k (22- 3ZT3 12~~ 040 ~c 10T. 0 I27 TO’s43 7 170 107.7

  17. National Program for Inspection of Non-Federal Dams, Merrymeeting Lake Dam (NH 00342), Merrimack River Basin, New Durham, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1978-10-01

    Durham. The Merrymeeting River is a tributary of Lake Winnipesaukee , and part of the Merrimack River Basin. b. Description of Dam and Appurtenances...An-AmI6 448 NATIONAL PIOMaAN FOR INSPECTION OF NON-FEDIRAL GAIS I/L MERRYlIETINO LAKE OA..IUI CORPS OF ENGINEERS at LIHA MA NEW ENGLANO OIV OCT 78 N...C t A mSSmIF I F/ 13/13 NL /I’I/ll IIIIINONEI i •on 1 -1 2 5 11111 -li 6 I MERRIMACK RIVER BASIN NEW DURHAM, NEW HAMPSHIRF In MERRYMEETING LAKE DAM N

  18. National Dam Safety Program. Potters Falls Dam (Inventory Number N.Y. 378), Oswego River Basin, Tompkins County, New York. Phase I Inspection Report,

    Science.gov (United States)

    1981-09-23

    feature is the arched curva - ture of the dam which would resist lateral pressures from the reservoir. It is also known that the structure has...I U I * I . * Io- Iq [. I * * -- *---- .- ~.- -. - -. . -~ * ~ - ~ .--- * -: L? u o 4 Idf W dI- f V f W00 go a AW~d " be fn - 04 02 01 In on a~ A.IO

  19. National Program for Inspection of Non-Federal Dams. Hanover Pond Dam (CT 00134), Quinnipiac River Basin, Meriden, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1979-02-01

    may pose hazards to human life or property. The assessment of the general condition of the dam is based upon available data and visual inspection...disouss this matter with Yom ftrther, or if ya fehr, you may request a nometing with the whole Boaw4,. In amy evout , I Sps to hear trom you ins few

  20. National Program for Inspection of Non-Federal Dams. Crystal Lake Dam (CT 00138), Lower Connecticut River Basin, Middletown, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1980-01-01

    than 2’ from the foundation, and each :. pie ." is keyed to its neighbor will reduce the piping liability along the rock contact. *"A11 parts of the... plano and ecifications for the proposed dam at Crystal Lake. Hr. Uelti has just returned from Switterland where he has spent a year study- Lng the

  1. National Dam Safety Program. Garnerville Dam (Inventory Number N.Y. 744), Hudson River Basin, Rockland County, New York. Phase I Inspection Report,

    Science.gov (United States)

    1980-08-01

    the literature on the general geology of the area. The rock in the area is the Brunswick Formation of the Newark Group of the upper Triassic ... temperature was 600 to 650 F. The reservoir had been lowered about 1 to 2 feet to allow inspection of the spillway crest and downstream face. b. Main Dam The

  2. National Dam Safety Program. Earl Reservoir Dam (Inventory Number N.Y. 203), Lower Hudson River Basin, Orange County, New York. Phase I Inspection Report,

    Science.gov (United States)

    1981-06-30

    3.6 feet at the left end of the dam where only the concrete faced masonry core wall is present, and there is virtually no embankment on either side...Structures o. Stability p. Miscellaneous 10) Appurtenant Structures (Power House, Lock, Gatehouse , Other) a. Description and Condition An abandoned pump house

  3. National Program for Inspection of Non-Federal Dams. Goodwin Dam (CT 00541), Farmington River Basin, Hartland, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1978-09-01

    virtually every structural element of this dam. Dr. K. Terzaghi considered various ~LIL sections for this design including a concrete core wall. In I...settlement at Indications of Movement of Structural gae house Items on Slopes gatehouse Trespassing on Slopes None permitted -- - Sloughing or Erosion of

  4. National Dam Safety Program. Hawkinsville Dam (Inventory Number NY 895), Black River Basin, Oneida County, New York. Phase I Inspection Report,

    Science.gov (United States)

    1981-09-10

    STABILITY 6.1 EVALUATION OF STRUCTURAL STABILITY a. Visual Observations This concrete dam functions as a spillway for virtually its entire length across the...Structures (Power House, Lock, Gatehouse , Other) a. Description and Condition ..... .... Cl 1 i l J 11) Operation Procedures (Lake Level Regulation):I I I I

  5. Prenatal and postnatal mothering by diesel exhaust PM2.5-exposed dams differentially program mouse energy metabolism.

    Science.gov (United States)

    Chen, Minjie; Liang, Shuai; Zhou, Huifen; Xu, Yanyi; Qin, Xiaobo; Hu, Ziying; Wang, Xiaoke; Qiu, Lianglin; Wang, Wanjun; Zhang, Yuhao; Ying, Zhekang

    2017-01-18

    Obesity is one of the leading threats to global public health. It is consequent to abnormal energy metabolism. Currently, it has been well established that maternal exposure to environmental stressors that cause inappropriate fetal development may have long-term adverse effects on offspring energy metabolism in an exposure timing-dependent manner, known as developmental programming of health and diseases paradigm. Rapidly increasing evidence has indicated that maternal exposure to ambient fine particles (PM2.5) correlates to abnormal fetal development. In the present study, we therefore assessed whether maternal exposure to diesel exhaust PM2.5 (DEP), the major component of ambient PM2.5 in urban areas, programs offspring energy metabolism, and further examined how the timing of exposure impacts this programming. The growth trajectory of offspring shows that although prenatal maternal exposure to DEP did not impact the birth weight of offspring, it significantly decreased offspring body weight from postnatal week 2 until the end of observation. This weight loss effect of prenatal maternal exposure to DEP coincided with decreased food intake but not alteration in brown adipose tissue (BAT) morphology. The hypophagic effect of prenatal maternal exposure to DEP was in concord with decreased hypothalamic expression of an orexigenic peptide NPY, suggesting that the prenatal maternal exposure to DEP impacts offspring energy balance primarily through programming of food intake. Paradoxically, the reduced body weight resulted from prenatal maternal exposure to DEP was accompanied by increased mass of epididymal adipose tissue, which was due to hyperplasia as morphological analysis did not observe any hypertrophy. In direct contrast, the postnatal mothering by DEP-exposed dams increased offspring body weight during lactation and adulthood, paralleled by markedly increased fat accumulation and decreased UCP1 expression in BAT but not alteration in food intake. The weight

  6. Programmed hyperphagia in offspring of obese dams: Altered expression of hypothalamic nutrient sensors, neurogenic factors and epigenetic modulators.

    Science.gov (United States)

    Desai, Mina; Han, Guang; Ross, Michael G

    2016-04-01

    Maternal overnutrition results in programmed offspring obesity, mediated in part, by hyperphagia. This is remarkably similar to the effects of maternal undernutrition on offspring hyperphagia and obesity. In view of the marked differences in the energy environment of the over and under-nutrition exposures, we studied the expression of select epigenetic modifiers associated with energy imbalance including neurogenic factors and appetite/satiety neuropeptides which are indicative of neurogenic differentiation. HF offspring were exposed to maternal overnutrition (high fat diet; HF) during pregnancy and lactation. We determined the protein expression of energy sensors (mTOR, pAMPK), epigenetic factors (DNA methylase, DNMT1; histone deacetylase, SIRT1/HDAC1), neurogenic factors (Hes1, Mash1, Ngn3) and appetite/satiety neuropeptides (AgRP/POMC) in newborn hypothalamus and adult arcuate nucleus (ARC). Despite maternal obesity, male offspring born to obese dams had similar body weight at birth as Controls. However, when nursed by the same dams, male offspring of obese dams exhibited marked adiposity. At 1 day of age, HF newborn males had significantly decreased energy sensors, DNMT1 including Hes1 and Mash1, which may impact neuroprogenitor cell proliferation and differentiation. This is consistent with increased AgRP in HF newborns. At 6 months of age, HF adult males had significantly increased energy sensors and decreased histone deactylases. In addition, the persistent decreased Hes1, Mash1 as well as Ngn3 are consistent with increased AgRP and decreased POMC. Thus, altered energy sensors and epigenetic responses which modulate gene expression and adult neuronal differentiation may contribute to hyperphagia and obesity in HF male offspring. Copyright © 2016 Elsevier Ltd. All rights reserved.

  7. National Program for Inspection of Non-Federal Dams. Abbott Memorial Trust Dam (NH 00260) (NHWRB 254.05) Merrimack River Basin, Wilton, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1979-04-01

    a more t1 pC rigorous program needed A-6 0 0 S S S a- a APPENDIX B FIGURE I Site Plan B- 2 FIGUE 2 Plan and Evaluation of Dar:.D- List of Pertinent...4> APPENDIX C LOCATION AND ORIENTATION OF PHOTOS w SABBOTT MEMORIA TRUST DAM NEW HAMPSHIRE SCALE 1 50SO IDATE NVME W C-2 1. View from right side of

  8. National Dam Safety Program. Marcy Reservoir Dam (Inventory Number NY 190). Mohawk River Basin, Oneida County, New York. Phase I Inspection Report,

    Science.gov (United States)

    1981-06-30

    Deopartment has PrepS ,"d Als anfL SPeoitioatione for the oonstuaition of a dam for the. Itioa 3stt Aq1u, Tiioh Is to be loosts8 On & Btrem Mxown as8 Miry...in entlc ikul c nlt or bac-kfill ....... I;~cc ’I, t~ I 11.0i :11(e treozt11. 201) NVlcieier lli-iriali ( i ,cc-10 1~ f . . tz ’icgI!j vih lckitici𔃺

  9. National Dam Safety Program. Onondaga Dam (Inventory Number NY 794), Oswego River Basin, Onondaga County, New York. Phase I Inspection Report.

    Science.gov (United States)

    1981-06-30

    of 25 feet with a 20 foot macadam roadway. The upstream face of the dam and downstream toe are riprapped. The outlet is an uncontrolled circular...Pervio-is fill, with rock drain at downstream toe Impervious Core - Impervious zone on upstream facej Grout Curtain - Where limestone is encountered...were encountered, the plans called for the limestone to be grouted . The left abutment is in contact with deposits of a kame delta named by Fairchild

  10. National Dam Safety Program. Henpeck Hollow Dam (MO 31256), Mississippi - Kaskaskia - St. Louis Basin, Washington County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1981-03-01

    uncontrolled, brick and mortar-lined spillway is located at the north end of the dam (right abutment). An auxiliary spillway, located at the south end...Regulating Facilities N/A 5 1. Main spillway Type Concrete and brick -lined, uncontrolled, trape- zoidal, broad-crested weir (5 f t wide) Length of weir 12 ft...Missouri Geologic Map (1979) as Ordovician age Gasconade Formation (Fig 4). The Gasconade Formation is typically a light brownish-gray cherty dolomite , with

  11. National Program for Inspection of Non-Federal Dams. Tilton Town Dam (NH 00151), Merrimack River Basin, Tilton, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1979-07-01

    square mile Lake Winnipesaukee drainage area. Maximum storage capacity is about 50 acre-feet. Tilton Town Dam is used to provide pondage for process...for the Winnipesaukee River from Lake Winnipesaukee to the Merrimack River, prepared for the New England Division, U.S. Army Corps of Engineers...mile Lake Winnipesaukee drainage area. The Winnipesaukee River originates at Lake Winnipesaukee and flows in a southwesterly direction through Paugus

  12. National Program for Inspection of Non-Federal Dams. Lake Waukewan Dam (NH 00306), Merrimack River Basin, Meredith, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1978-10-01

    SAFETY, Merrimack River Basin Meredith New Hampshire Man made outlet between Lake Waukewan and Lake Winnipesaukee 20. ABSTRACT (Contne. en *ere* 80 it...Belknap Town Located: Meredith 5 O Stream: Man made outlet between Lake Waukewan and Lake Winnipesaukee Date of Inspection: June 6, 1978 BRIEF...ASSESSMENT Lake Waukewan Dam is a man-made outlet facility between Lake Waukewan V’ and Lake Winnipesaukee . The facility, a surge and outlet structure has a

  13. National Program for Inspection of Non-Federal Dams. Babson Reservoir Dam (MA 00187), Massachusetts-Rhode Island Coastal Basin, Gloucester, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1978-11-01

    21979 Honorable Edward 3. King Governor of the Commonwealth of a. Massachusetts State House Boston, Massachusetts 02133 Dear Governor King: I am...City of Gloucester. H. Desian and Construction History. The Babson Reservoir Dam was desi3gned by Fay, Spofford a Thorndike in 1930 to create a water...drawings prepared by Fay, Spofford and Thorndike are included in Appendix B to show details of the original construction. Flashboards were added as

  14. National Dam Safety Program. Shackamaxon Dam (NJ00369), Rahway River Basin. Lambert’s Run, Union County, New Jersey. Phase I Inspection Report.

    Science.gov (United States)

    1980-03-01

    DOPLM FL10 1~REPORT NUMBER 12. GOVT ACCESSION NO. 3. RECIPIENTSl CATALOG NUMBER NJ 003 69 j-#17 q __________ 4TITLE (and Subtitle) S. TYPE OF REPORT...golf course. Principal access to the dam is by private paved road inside the golf course. 3 c. Size and Hazard Classification Size and Hazard...Lester A., Hydraulic Charts for the Secection of Highway Culverts, U.S. Department of Transportaion , Federal Highway Administration, 1965. 7. Safety of

  15. National Program for Inspection of Non-Federal Dams. Lake Wintergreen Dam (CT 00118), Quinnipiac River Basin, Hamden, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1978-08-01

    Information Act. In the case of this report the release date will be thirty days from the date of this letter. I wish to take this opportunity to...the facility to pass a greater percentage of the Test Flood. ( eStudies should also be performed to determine whether seepage through the earthen...dam is based on observations of field conditions at the time of inspection along with data available to the inspection team. In cases where the

  16. National Dam Safety Program. Newburg Mill Dam (NJ 00779) Delaware River Basin, Musconetcong River, Warren County, New Jersey, Phase I Inspection Report.

    Science.gov (United States)

    1981-08-01

    dam or to thu property line, whichever is the lesser distance. ANDERSON- NICHO -{ & ’OMPA iY, INC. Warren A. Guinan, P.E. Project Manager New Jersey...Ande-son- Nicho & Company, Inc. SDte o I Computed JOB NO. Checked F’ IOUARES 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

  17. National Dam Safety Program. Upper Occoquan Regional Water Reclamation Plant Dam (Inventory Number VA 05924), James River Basin, Fairfax County, Virginia. Phase I Inspection Report.

    Science.gov (United States)

    1980-09-01

    An inspection was muade 1 My 1980 and the weather was sunny with a temperature of 700 F. The pool and tailwater levels at the time of inspection...exposed along the right side of the spillway outlet channel. These rocks belong to the Newark Formation of Triassic Age. The dam and reservoir are...34. Although no field permeability data was provided, natural permeabilities in Triassic shales are typically low except in the presence of fracturing or

  18. Lower Granite Dam Smolt Monitoring Program, 2004-2005 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Mensik, Fred; Rapp, Shawn; Ross Doug (Washington Department of Fish and Wildlife, Olympia, WA)

    2005-11-01

    The 2004 fish collection season at Lower Granite Dam (LGR) was characterized by above average water temperatures, below average flows and spill, low levels of debris. The number of smolts collected for all species groups (with the exception of clipped and unclipped sockeye/kokanee) exceeded all previous collection numbers. With the continued release of unclipped supplementation chinook, steelhead and sockeye above LGR, we can not accurately distinguish wild chinook, wild steelhead and wild sockeye/kokanee from hatchery reared unclipped chinook and sockeye/kokanee in the sample. Wild steelhead can be identified from hatchery steelhead by the eroded dorsal and pectoral fins exhibited on unclipped hatchery steelhead. The numbers in the wild columns beginning in 1998 include wild and unclipped hatchery origin smolts. This season a total of 11,787,539 juvenile salmonids was collected at LGR. Of these, 11,253,837 were transported to release sites below Bonneville Dam, 11,164,132 by barge and 89,705 by truck. An additional 501,395 fish were bypassed to the river due to over-capacity of the raceways and for research purposes. According to the PTAGIS database, 177,009 PIT-tagged fish were detected at LGR in 2004. Of these, 105,894 (59.8%) were bypassed through the PIT-tag diversion system, 69,130 (39.1%) were diverted to the raceways to be transported, 1,640 (0.9%) were diverted to the sample tank, sampled and then transported, 345 (0.2%) were undetected at any of the bypass, raceway or sample exit monitors.

  19. National Program for Inspection of Non-Federal Dams. Diamond International Corporation, Upper Dam (MA 00562) Connecticut River Basin, Palmer, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1980-10-01

    STANDARDS-2963-A *~ .. 2 rprh(oDnierI AT CGOVfRNMENT FX)’ FNIr N’ CONNECTICUT RIVER BASIN PALMER, MASSACHUSETTS Lfl K .IDIAMOND INTERNATIONAL...M.l DAM Ck’d By DaILte J 4zp . (I) Ts 4 F70 0 4d 0 -- Ca0 ±r~av-!j, Te4 PRaoc I- 0 o Dvo.I., c Alreg.. I 3 8,oev c-. o- 2lSo*l Ln c Ooopd au ( rat Oav

  20. National Dam Safety Program. Lake Arrowhead Dam (Inventory Number VA 17908), Potomac River Basin, Stafford County, Virginia. Phase I Inspection Report.

    Science.gov (United States)

    1980-07-01

    Grouted riprap may be necessary. A trash rack should be installed on the principal spillway riser. The driftwood in the pool below the principal...and side slopes ofI 8.5 H:lV and 2.5H:lV on the left and right sides, respectively. The control section is located on a two-lane macadam road which...two-lane macadam road which provid-es access to the residences around Lake Arrowhead runs along the dam crest; a similar road runs along the crest of

  1. National Program for Inspection of Non-Federal Dams. Muddy cove Pond Dam (MA 00793) Taunton River Basin, Dighton, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1979-11-01

    Structural Stability 6-1 a. Visual Observation 6-1 b. Design and Construction Data 6-1 c. Operating Records 6-1 d. Post-Construction Changes 6-1 e...spillway structure . The embankment maximum height is about 32 feet and it has a crest width of 16 feet. The design drawings indicate the embankment...Changes - There are no known modifications or post-construction changes which affect the dam’s structural stability. e. Siesmic Stability - Muddy Cove

  2. National Dam Safety Program. Cedar Grove Lake Dam (MO 11075), Missouri - Kansas City Basin, Warren County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1980-09-01

    assesmeut of the hydlrology of the watershed and capacity of the spillway were baised on a hydrologic! hydraulic study as indicated in Section 5. Seepage...outflow resulting from a storm of probable maximum flood magnitude, which is the recommended spillway design flood for this dam. in either case , the...20 ..𔃻 .50 1.00 MJ-AWA RrWfF C0UFINUAT10N INFLOW HYDRCQRNp1 ISTAQ ICCt’P IECt ITAPE JP..T JRT INH ISTAGE 1I UT 0 INFLOW 0 0 0 0 0 1 0 0 HYIIfTA94

  3. National Dam Safety Program. Morris Lake Dam (NJ00306). Hudson River Basin, Tributary of Wallkill River, Sussex County, New Jersey. Phase I Inspection Report.

    Science.gov (United States)

    1981-03-01

    Water, operational procedures are the following: Chlorine and fluoride are added at the Gatehouse prior to the water entering the 12 and 16 inch water...operational procedures for the dam include daily recordings of water main flow, fluoridation and chlorination of water and periodic cleaning of the water...INC. 14𔃾J U go IA Ci C _6 0 I a 0 D10 C4- + + ii P bil B A DATE Jo3e NA~7~ M1W (MA o. CKD -T~ DATE 4176IAe~~SLAke IPAir SHEET NO. 3 O.. LANGAN

  4. National Program for Inspection of Non-Federal Dams. Erikson Dam MA 00195, Assabet River Basin, Acton, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1979-12-01

    1980 WAoTHAM, MASSAchusEtts 00521.3..3.. .. REPLY 1Ŕ . - - - . . Honorable Edward 3. King Governor of the Commonwealth of Massachusetts...C: :- 0Fp 3/~EDWAR SMICHAEL Edward M. GcoP ~c~REC ~ Project Manager N.Metcalf & Ed*Inc. ION~~r Massachusetts Registration No. 29800 Approved by...1961 plan by Fay, Spofford and Thorndike , Inc. (1) Top of dam: 191.4 to 194.9 (2) Test flood pool: 198.0 (100-year flood) -’ (3) Design surcharge

  5. National Dam Safety Program. Little Choconut Watershed Site 2B Dam (Inventory Number 721), Susquehanna River Basin, Broome County, New York. Phase I Inspection Report,

    Science.gov (United States)

    1981-06-30

    ASSESSMENT/RECOMMENDATIONS 20 7.1 ASSESSMENT 20 7.2 RECOMMENDED MEASURES 21 APPENDICES A. PHOTOGRAPHS B. VISUAL INSPECTION CHECKLIST C. HYDROLOGIC...I I I I I I I I APPENDIX B I VISUAL INSPECTION CHECKLIST I I I I I I I VISUAL INSPECTION CHECKLIST 1) Basic Data a. General Name of Dam Little...010iMiTS N i NO4ARD SAMPLE WA uchl) DSE E OW- 0 5, JaC QRAVEL CLASS- -~~~ - - ICATIAM UILIS’A DR OPTMU 2 L - , - Caw[E DEISIAT I liull M, Dio #4 2 5/ P 1

  6. National Dam Safety Program. Conklingville Dam, Inventory no. NY 146, Upper Hudson River Basin, Saratoga County, New York. Phase 1 Inspection Report

    Science.gov (United States)

    1978-07-31

    Assessment/Remedial Measures 14 Appendices: A. Geology B. Hydrologic Computat tons C. Photographs D. Pertinent Correspondence and Reports E...Ii1~ II LI II I’ II iii * I I I APPENDIX GEOLOGY -g * I [-I ii LI 4 LI 44 [1 El El < i Conklingville Dam and Sacandaga Lake The bedrock in the vicinity...0,0i. e~ t’ 11U ŕ 7 ’ .vx~ suam wwfi~u ro w vpotAvt 1+99xniVwp - ’\\4..>. 4 - .,,-.. I

  7. National Program for Inspection of Non-Federal Dams. Upper Groveton Dam N.H. 00148, Connecticut River Basin, Groveton, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1979-02-01

    Mlax ...;’ ......... ft.: Min. ...St0m L."e.............................f t. P Flashboards-Type F1:: 1 sentionn 91 r,2’ noir :,ble.:Hih . ~ . . . f...Approach Channel Slope Conditions Bottom Conditions Rock Slides or Falls Log Boom Debris Condition of Concrete Lining p - Drains or Weep Holes b...Inventory of Dams II I S 41 w thi LAL3 I~Xo AIL~. 0~~ CI- I VFTT~j .J’ I LI . Li 7-J__ _ 1~ ____; 5 _ _ _ i)4 . -C cc - ~l 2 w 4 I 0 j I % ~ . - *lo FILMED * 8-85 * DTIC

  8. Dam Safety Concepts

    NARCIS (Netherlands)

    Duricic, J.

    2014-01-01

    The majority of dams constructed in the world are dams that can be categorized as embankment dams. Throughout history we can point to many failures of dams, and embankment dams in particular. Nowadays it is clear that the goal to construct stable dams has not been achieved, even with advanced

  9. National Program for Inspection of Non-Federal Dams. Rogers Pond Dam (CT 00428), Connecticut River Basin, Deep River, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1981-04-01

    8217 " : ’• . .. "’ .: ," . 3. Establish a monitoring program for use during and immediately after heavy rainfall and also a downstream .0t warning program...edge of spillway. 12.iwo owsra altolf fsilwycanl PHLPW GNVS ASCAE ,IC OER OD DM C048 ENGINEER HADE C.-CIC C-0 13 iwo ontemwalt eto plwy meow. 14 iwo anfo

  10. National Program for Inspection of Non-Federal Dams. Plymouth Reservoir Dam (CT 00286), Naugatuck River Basin, Plymouth, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1981-05-01

    only a 2.7 foot drop in head between piezometer W-1 and W-3 indicating a virtually unimpeded flow through the core wall. The spacing of the...NOTE LACK OF RIPRAP ABOVE WATER LEVEL. US ARMY ENGINEER DIV NEW ENGLAND PLY MOLITH I L’ I V1 )% CORPS OF ENGINEERS NATIONAL PROGRAM OF TRI .--- T H AULA

  11. National Dam Inspection Program. Lake Henry Dam (NDI ID Number PA-00154, DER ID Number 64-34), Delaware River Basin, Tributary to Jones Creek, Wayne County, Pennsylvania. Phase I Inspection Report,

    Science.gov (United States)

    1980-07-01

    maintenance of the dam. The LHCA paved the auxiliary spillway with macadam and "faced the dam with concrete" in 1975. The concrete facing is apparently...masonry. Cut-off Unknown. Grout Curtain None. h. Diversion and Regulating Tunnel. None. i. Spillway. Type Main Approximate trapezoidal- shaped section...auxiliary spillway is located near the center of the dam. The auxiliary spillway was obscured by a thin layer of soil (Photograph H). Macadam was observed at

  12. National Program for Inspection of Non-Federal Dam. Lakeport Dam (N.H. 00216), State Number 130.01, Merrimack River Basin, Laconia, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1980-08-01

    abutment. The dam impounds a reservoir of large size with a maximum usable storage capacity of 165,800 acre-feet. Lake Winnipesaukee has a surface...level of Lake Winnipesaukee to 509’ NGVD. Backwater analysis indicates a drop of 3.8 feet from the lake surface to Lakeport Dam at this elevation. The... Winnipesaukee River at the outlet of Lake Winnipesaukee at the Weirs. Lakeport Dam, although located downstream of the outlet, controls the water level and

  13. National Dam Inspection Program. Jennings Pond Dam (NDI I.D. PA-0891 DER I.D. 066-012) Susquehanna River Basin, Little Mehoopany Creek, Wyoming County, Pennsylvania. Phase I Inspection Report,

    Science.gov (United States)

    1981-03-19

    overflow section. 4.2 Maintenance of the Dam. The maintenance of the dam is considered to be fair. The abutments are relatively free of unwanted brush ...drainage area. STORAGE VS. ELEVATION ELEVATION AH, FEET AREA 6VOLUMV STORAI;E (acres) ( 1 ) (acre- teet ) (21 ) (acre-1e-t) 1020 83.6 q. 1009 [1 4

  14. National Dam Inspection Program. Page’s Lake Dam NDI Number PA 00062 PennDER Number 58-5) Susquehanna River Basin, Salt Lick Creek, Susquehanna County, Pennsylvania. Phase I Inspection Report.

    Science.gov (United States)

    1981-02-01

    based upon available data and visual inspections. Detailed investigation, and analyses involving topographic mapping, subsurface investigations, teEting ...potential of the dam. 2) Fill the erosion gully located to the left of the spillway and reseed the area. 3) Remove the brush below the downstream face...in Appendix A. b. Dam - A small erosion gully has formed at the junction of the left spillway training wall and embankment. Brush was present

  15. National Program for Inspection of Non-Federal Dams. Badger Pond Dam (NH 00085), State No. 21.02 Merrimack River Basin, Belmont, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1979-11-01

    PMF was selected as the test flood. The test flood inflow, using the ’mountainous’ guide curve and the PMF outflow from the Sargent Lake Dam inspection...approximately 5 miles before emptying into the Winnipesaukee River about 0.2 mile northeast of the boundary intersection among the Towns of Belmont...Northfield and Tilton. The Winnipesaukee River is a 1-1 major tributary in the Merrimack River Basin. Badger Pond Dam is shown on U.S.G.S. Quadrangle

  16. Dam removal: Listening in

    Science.gov (United States)

    Foley, Melissa M.; Bellmore, James; O'Connor, James E.; Duda, Jeff; East, Amy E.; Grant, Gordon G.; Anderson, Chauncey; Bountry, Jennifer A.; Collins, Mathias J.; Connolly, Patrick J.; Craig, Laura S.; Evans, James E.; Greene, Samantha; Magilligan, Francis J.; Magirl, Christopher S.; Major, Jon J.; Pess, George R.; Randle, Timothy J.; Shafroth, Patrick B.; Torgersen, Christian; Tullos, Desiree D.; Wilcox, Andrew C.

    2017-01-01

    Dam removal is widely used as an approach for river restoration in the United States. The increase in dam removals—particularly large dams—and associated dam-removal studies over the last few decades motivated a working group at the USGS John Wesley Powell Center for Analysis and Synthesis to review and synthesize available studies of dam removals and their findings. Based on dam removals thus far, some general conclusions have emerged: (1) physical responses are typically fast, with the rate of sediment erosion largely dependent on sediment characteristics and dam-removal strategy; (2) ecological responses to dam removal differ among the affected upstream, downstream, and reservoir reaches; (3) dam removal tends to quickly reestablish connectivity, restoring the movement of material and organisms between upstream and downstream river reaches; (4) geographic context, river history, and land use significantly influence river restoration trajectories and recovery potential because they control broader physical and ecological processes and conditions; and (5) quantitative modeling capability is improving, particularly for physical and broad-scale ecological effects, and gives managers information needed to understand and predict long-term effects of dam removal on riverine ecosystems. Although these studies collectively enhance our understanding of how riverine ecosystems respond to dam removal, knowledge gaps remain because most studies have been short (< 5 years) and do not adequately represent the diversity of dam types, watershed conditions, and dam-removal methods in the U.S.

  17. Hoover Dam Learning Packet.

    Science.gov (United States)

    Bureau of Reclamation (Dept. of Interior), Washington, DC.

    This learning packet provides background information about Hoover Dam (Nevada) and the surrounding area. Since the dam was built at the height of the Depression in 1931, people came from all over the country to work on it. Because of Hoover Dam, the Colorado River was controlled for the first time in history and farmers in Nevada, California, and…

  18. National Program for Inspection of Non-Federal Dams. Crystal Lake Dam (NH 00018) (NHWRB Number 91.11) Merrimack River Basin, Gilmanton, New Hampshire. Phase I Inspection Report.

    Science.gov (United States)

    1978-11-01

    were disclosed. 2.4 Evaluation a. Availability. Little engineering data were available for Crystal Lake Dam. A search of the files of the New Hampshire...Mazur, G. Slaney Engingeers AREA EVALUATED CONDITION OUTLET WORKS - INTAKE CHANNEL AND INTAKE STRUCTURE * a. Approach Channel This facility has ’no

  19. National Dam Inspection Program. Star Junction Number 1 Dam (NDI Number PA-00198, PennDER Number 26-30) Ohio River Basin, Washington Run, Fayette County, Pennsylvania. Phase I Inspection Report,

    Science.gov (United States)

    1980-04-01

    end and erosion K of the training dike has occurred. g. Instrumentation : No instrumentation was observed during the inspection. h. Downstream...DATE: 19 MAR 80 RN TDZ: 10.30.40 NATIONAL PROGR FOR TEM INSPEC ION OF NON-FEERAL DM HXDROLOMC AND MRAILIC ANALISIS OF STAR JUNCTION NamR 1 DAm PROBABLE

  20. National Dam Inspection Program. Lower Hemlock Dam (NDI-ID Number PA-00756, DER-ID Number 52-117) Delaware River Basin, Pike County, Pennsylvania. Phase I Inspection Report.

    Science.gov (United States)

    1980-06-01

    profile (Plate A-II, Appendix A) indicates that the crest of the dam is in a sag , with only a short low area. The downsteam slope is very irregular due...NORMAL POOL ELEVATION: 1432 (estimated) AT TIME OF INSPECTION: BREAST ELEVATION: 1435.25 (design) POOL ELEVATION: 1432.2 SPILLWAY ELEVATION: 1432.0

  1. National Program for Inspection of Non-Federal Dams. Pentucket Pond Outlet (MA 00261), Parker River Basin, Georgetown, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1979-10-01

    Side slopes: upstream 2:1 downstream - 3.0 to 5.5:1 (6) Zoning: Unknown (7) Impervious core: Unknown (8) Cutoff: Unknown (9) Grout curtain: Unknown...condition. The roadway which forms the dam is in good condition. A good macadam has been built on - this roadway since the last inspection. The dam is in

  2. National Program for Inspection of Non-Federal Dams. Lyman Mill Pond (MA 00500), Connecticut River Basin, Southampton, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1979-03-01

    the area S beyond the northerly abutment was breached, although the dam proper remained intact. Heavy stone fill was used to close this breach. U.S...left abutment. ~0 P~1,0’T’, -,ntl anfc f anfo riqht abutme-nt. fioo dmfo PHOTO NO. 1I Downstream face of dam from laft abutment. 0 PHOTO Pu, Lcmface

  3. National Dam Inspection Program. Laurel Run Number 2 Dam. (NDI ID Number PA-00550, DER ID Number 40-23), Susquehanna River Basin, Laurel Run, Luzerne County, Pennsylvania. Phase I Inspection Report,

    Science.gov (United States)

    1980-04-01

    ATION L DARISEIN PROGRAMA ~f{ASE NSPECTION 4EPORT~ NAINA AMISPCIO GAM~ N Prepared by GANNETT FLEMING CORDDRY AND CARPENTER, INC.-" Consulting...which may pose hazards to human life or property. The assess- ment of the general condition of the dam is based upon available data and visual inspections...3 - Visual Inspection . . . . . . . 8 SECTION 4 - Operational Procedures . . . . . 11 SECTION 5 - Hydrology and Hydraulics. . . . . 13 SECTION 6

  4. National Dam Inspection Program. Pinetree Lake Dam NDI ID number PA-00784, DER ID number 45-244. Delaware River Basin, Dry Sawmill Run. Monroe County, Pennsylvania. Phase I Inspection Report.

    Science.gov (United States)

    1980-04-01

    is encased in concrete, continued rusting would nc. be a hazard to the dam. b. Design and Construction Data. The design engineer stated that a formal...DATA: Drainage Sub- Area Cp Ct L L a L’ T2 Map Plate area (square miles miies miles hours Area miles) ( (2) (3) (4) (5) (6) (8) A t- 2.. QO. AlO f 36

  5. National Dam Inspection Program. Shawnee Dam (NDI-ID number PA-00629), DER-ID number 45-115 Shawnee Development, nc. Delaware River Basin, Shawnee Creek, Monroe County, Pennsylvania. Phase I Inspection Report.

    Science.gov (United States)

    1980-01-01

    brush from the embankment. Upon removal of brush and trees, the embankment should be inspected for bulges, cracks, and other signs of distress. Take...apron. j. Regulating Outlets. Type. One 30-inch diameter reinforced concrete pipe. -5- - .- ka ..Sii,-i~~i j. Regulating Outlets. (Cont’d.) Length ( teet ...level is overgrown with brush and trees (Photograph C). The riprap is intact, but it does not extend to the top of the dam. The portion of the slope

  6. Abstracts and electronic proceedings of the Canadian Dam Association's 2008 annual conference : emerging technologies for dams; Resumes et actes electroniques du congres annuel 2008 de l'Association canadienne des barrages : technologies naissantes pour les barrages

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2008-07-01

    This conference provided a national forum to explore and discuss emerging technologies which can be used to enhance dam safety and construction practices on both new and existing projects. Advancements in the fields of dam design, construction, and remedial works were reviewed as well as new techniques for dam monitoring programs. Engineers, geoscientists, dam owners and operators and other stakeholders exchanged ideas and information regarding the operation, maintenance and management of water and tailings dams. The conference sessions dealt with a variety of topics, including dam foundations; mining dams; dams and the environment; embankment dams; dams and seismicity; hydrotechnics; assessment and investigative technologies; dam instrumentation and monitoring; computational hydraulics; and dam safety. The conference featured 46 presentations, of which 37 have been catalogued separately for inclusion in this database. refs., tabs., figs.

  7. National Program of Inspection of Non-Federal Dams, Tennessee. Chancellor & Son Dam (Inventory Number TN 06939), Hatchie River Basin, near Saulsbury, Hardeman County, Tennessee. Phase I Investigation Report,

    Science.gov (United States)

    1981-09-01

    7474 Raleigh LaGrange Rd. Cordova , TN 38018 1 W 7% 1 A.4.6 Previous Inspection - February 1978 A.4.7 Seismic Zone - 2 A.5 Downstream Hazard Data A.5.1... App xtewuces None L. Unusual Increase or Decrease in Dischare from Belief Wells None 6 Ins truentation~ - None A. rbonaantation/Siizvoys___...Chancellor Chancellor & Sons Construction Co. 7474 Raleigh LaGrange Road Cordova , TN 38O18 Dear !fr. Chancellor: As provideto by the State Safe Dams Act

  8. National Dam Safety Program. Conewango Creek Dam (Site 16A), (Inventory Number N.Y. 557), Allegheny River Basin, Conewango Creek Watershed, Cattaraugus County, New York. Phase I Inspection Report

    Science.gov (United States)

    1981-08-18

    mcLa ZnL ts _n-tion and an:’.. 72 ba.v-c oil~s. L~iO~.. 2JZ ... UL.1 by z- perilt,--rmdng organrExamination of available documents and vtisual inspection...I the east emergency spillway. It is recommended that each of these conditions be further evaluated by a qualified registered professional engineer ...Using the Corps of Engineers screening criteria for review of spillway I adequacy, it has been determined that the dam would not be overtopped under

  9. National Dam Inspection Program. Deckers Dam (NDI ID Number PA-00299, DER ID Number 64-203), Delaware River Basin, Seeley Brook, Wayne County, Pennsylvania. Phase I Inspection Report

    Science.gov (United States)

    1981-07-01

    600 DICKERS DAM - II ’ j 41 4c3r : A iI :1 -i L i, .-. ,. II / w I IS {.. N Si •,: -. •sA An!*Ljnn n rn n~ x~ IL iin Li. 0 U. N w 0 (0 CL Zu) Ei...8217i~) •5 /2 0 192 477 /Z9~’ q1 Is5A Joe GEO-TECHNICAL SERtVICES *m~N CALCULATED ByConsultng Eno mense & O ~ l ssC0ECKEW DVATE SCALEj n-/ 127-R 72’ r

  10. A Methyl-Deficient Diet Fed to Rat Dams during the Peri-Conception Period Programs Glucose Homeostasis in Adult Male but Not Female Offspring123

    Science.gov (United States)

    Maloney, Christopher A.; Hay, Susan M.; Young, Loraine E.; Sinclair, Kevin D.; Rees, William D.

    2011-01-01

    Methyl deficiencies have been implicated in metabolic programming during the periods of oocyte and embryo development. Semisynthetic methyl-deficient diets (MD) with no folic acid, 0.05% choline, and approximately one-half the recommended content of methionine were fed to female rats for 3 wk prior to mating and for the first 5 d of gestation. During the period of MD feeding, plasma homocysteine concentrations were approximately twice those of rats fed the complete (CON) diet. From d 5, both groups received a complete semipurified AIN diet until birth. On d 8, plasma homocysteine concentrations did not differ between the 2 groups. Thereafter, dams and offspring were fed a nonpurified diet for the remainder of the experiment. At 6 mo of age, the homeostatic model assessment (HOMA) index of the male MD offspring tended to be 32% higher (P = 0.053) and peak insulin during an oral glucose tolerance test (oGTT) was 39% higher (P < 0.05) compared with the male CON offspring. There was no difference in the response to an oGTT in the female offspring at 6 mo of age. The increased HOMA index of male MD offspring persisted to 12 mo of age. The peak glucose concentration during oGTT was 23% higher (P < 0.05) in MD compared with the CON males despite 39% greater (P < 0.05) peak insulin concentrations. This study shows that in rats, a physiologically relevant methyl-deficient diet fed during the period of oocyte maturation and preimplantation development programs gender-specific changes in glucose handling by the offspring. PMID:21106931

  11. Role of the Small Intestine in Developmental Programming: Impact of Maternal Nutrition on the Dam and Offspring123

    Science.gov (United States)

    Meyer, Allison M; Caton, Joel S

    2016-01-01

    Small-intestinal growth and function are critical for optimal animal growth and health and play a major role in nutrient digestion and absorption, energy and nutrient expenditure, and immunological competence. During fetal and perinatal development, the small intestine is affected by the maternal environment and nutrient intake. In ruminants, altered small-intestinal mass, villi morphology, hypertrophy, hyperplasia, vascularity, and gene expression have been observed as a result of poor gestational nutrition or intrauterine growth restriction. Although many of these data come from fetal stages, data have also demonstrated that nutrition during mid- and late gestation affects lamb small-intestinal growth, vascularity, digestive enzyme activity, and gene expression at 20 and 180 d of age as well. The small intestine is known to be a highly plastic tissue, changing with nutrient intake and physiological state even in adulthood, and the maternal small intestine adapts to pregnancy and advancing gestation. In ruminants, the growth, vascularity, and gene expression of the maternal small intestine also adapt to the nutritional plane and specific nutrient intake such as high selenium during pregnancy. These changes likely alter both pre- and postnatal nutrient delivery to offspring. More research is necessary to better understand the role of the offspring and maternal small intestines in whole-animal responses to developmental programming, but programming of this plastic tissue seems to play a dynamic role in gestational nutrition impacts on the whole animal. PMID:27180380

  12. Reported tailings dam failures

    Energy Technology Data Exchange (ETDEWEB)

    Rico, M. [CSIC - Instituto Pirenaico de Ecologia, Zaragoza (Spain)], E-mail: mayterico@ipe.csic.es; Benito, G. [CSIC - Centro de Ciencias Medioambientales, Madrid (Spain); Salgueiro, A.R. [CERENA - Centro de Recursos Naturais e Ambiente of IST, Lisboa (Portugal); Diez-Herrero, A. [Geological Hazards Unit, Spanish Geological Survey (IGME), Madrid (Spain); Pereira, H.G. [CERENA - Centro de Recursos Naturais e Ambiente of IST, Lisboa (Portugal)

    2008-04-01

    A detailed search and re-evaluation of the known historical cases of tailings dam failure was carried out. A corpus of 147 cases of worldwide tailings dam disasters, from which 26 located in Europe, was compiled in a database. This contains six sections, including dam location, its physical and constructive characteristics, actual and putative failure cause, sludge hydrodynamics, socio-economical consequences and environmental impacts. Europe ranks in second place in reported accidents (18%), more than one third of them in dams 10-20 m high. In Europe, the most common cause of failure is related to unusual rain, whereas there is a lack of occurrences associated with seismic liquefaction, which is the second cause of tailings dam breakage elsewhere in the world. Moreover, over 90% of incidents occurred in active mines, and only 10% refer to abandoned ponds. The results reached by this preliminary analysis show an urgent need for EU regulations regarding technical standards of tailings disposal.

  13. Renal Metabolic Programming Is Linked to the Dynamic Regulation of a Leptin-Klf15 Axis and Akt/AMPKα Signaling in Male Offspring of Obese Dams.

    Science.gov (United States)

    Kasper, Philipp; Vohlen, Christina; Dinger, Katharina; Mohr, Jasmine; Hucklenbruch-Rother, Eva; Janoschek, Ruth; Köth, Jessica; Matthes, Jan; Appel, Sarah; Dötsch, Jörg; Alejandre Alcazar, Miguel A

    2017-10-01

    Childhood obesity is associated with renal diseases. Maternal obesity is a risk factor linked to increased adipocytokines and metabolic disorders in the offspring. Therefore, we studied the impact of maternal obesity on renal-intrinsic insulin and adipocytokine signaling and on renal function and structure. To induce maternal obesity, female mice were fed a high-fat diet (HFD) or a standard diet (SD; control group) prior to mating, during gestation, and throughout lactation. A third group of dams was fed HFD only during lactation (HFD-Lac). After weaning at postnatal day (P)21, offspring of all groups received SD. Clinically, HFD offspring were overweight and insulin resistant at P21. Although no metabolic changes were detected at P70, renal sodium excretion was reduced by 40%, and renal matrix deposition increased in the HFD group. Mechanistically, two stages were differentiated. In the early stage (P21), compared with the control group, HFD showed threefold increased white adipose tissue, impaired glucose tolerance, hyperleptinemia, and hyperinsulinemia. Renal leptin/Stat3-signaling was activated. In contrast, the Akt/ AMPKα cascade and Krüppel-like factor 15 expression were decreased. In the late stage (P70), although no metabolic differences were detected in HFD when compared with the control group, leptin/Stat3-signaling was reduced, and Akt/AMPKα was activated in the kidneys. This effect was linked to an increase of proliferative (cyclinD1/D2) and profibrotic (ctgf/collagen IIIα1) markers, similar to leptin-deficient mice. HFD-Lac mice exhibited metabolic changes at P21 similar to HFD, but no other persistent changes. This study shows a link between maternal obesity and metabolic programming of renal structure and function and intrinsic-renal Stat3/Akt/AMPKα signaling in the offspring. Copyright © 2017 Endocrine Society.

  14. Allegheny County Dam Locations

    Data.gov (United States)

    Allegheny County / City of Pittsburgh / Western PA Regional Data Center — This dataset shows the point locations of dams in Allegheny County. If viewing this description on the Western Pennsylvania Regional Data Center’s open data portal...

  15. National Program for Inspection of Non-Federal Dams. Reservoir Number One (MA 00337) Merrimack River Basin. Framingham, Massachusetts. Phase I Inspection Report.

    Science.gov (United States)

    1979-04-01

    be considered adequately safe for access to a water supply gate. Otherwise, the minor defi- " " ciences noted require remedial action, but should have...also been removed by the citizens of Framingham. * The upper part of the reservoir, near Dam Yo. 3, is crossed by a now highway with an iron bridge

  16. Project Planning for Cougar Dam during 2010

    Science.gov (United States)

    Haskell, Craig A.; Tiffan, Kenneth F.

    2011-01-01

    Cougar Dam is a 158 m-tall, rock fill dam located about 63 km east of Springfield, Oregon. Completed in 1963, the dam is owned and operated by the U.S. Army Corps of Engineers (USACE). It impounds Cougar Reservoir, which is 9.7 km long, has a surface area of 518 ha, and is predominately used for flood control. The pool elevation typically ranges from a maximum conservation pool of 515 m (1,690 ft) National Geodetic Vertical Datum (NGVD) in summer to a minimum flood control elevation of 467 m (1,532 ft NGVD) in winter. The reservoir thermally stratifies in the summer, has an average depth of 37 m, and holds 153,500 acre-feet when full. Cougar Dam is located on the South Fork of the McKenzie River 7 km upstream from the mainstem McKenzie River, a tributary of the Willamette River. The McKenzie River Basin basin supports the largest remaining population of wild spawning spring Chinook salmon in the Willamette River Basin (National Oceanic and Atmospheric Administration; NOAA, 2008). Cougar Dam and others were collectively deemed to cause jeopardy to the sustainability of anadromous fish stocks in the Willamette River Basin (NOAA, 2008). Prior to dam construction, as many as 805 redds were observed in the South Fork of the McKenzie River (Willis and others, 1960) and it is estimated that 40 km of spawning habitat were lost when access was blocked after dam construction. The 2008 Willamette Biological Opinion (BIOP) requires improvements to operations and structures to reduce impacts on Upper Willamette River (UWR) Chinook salmon (Oncorhynchus tshawytscha) and UWR steelhead (O. mykiss; NOAA, 2008). In 2010, an adult fish collection facility was completed below Cougar Dam to collect returning adult salmon for transport to spawning habitats above the dam. Before that time, returning adult spring Chinook salmon were transported to upstream spawning areas as part of a trap-and-haul program with adults passed ranging annually from 0 to 1,038 (Taylor, 2000). The progeny of

  17. Limnology of hartbeespoort dam

    CSIR Research Space (South Africa)

    Ashton, PJ

    1985-01-01

    Full Text Available consequences, for example the proliferation of filter clogging algae. Pilot or full-scale experimentation will be necessary to establish the true poten tial of this technique as a in-dam method for dealing with eutrophied waters. (d) Protein harvesting... essential amino-acids and is therefore of little practical use. If the conditions in the dam could be changed to result in a more palatable algae, this will have definite advantages (vi) for its protein production potential. Unfortunately, the factors...

  18. Dam health diagnosis and evaluation

    Science.gov (United States)

    Wu, Zhongru; Su, Huaizhi

    2005-06-01

    Based on the bionics principle in the life sciences field, we regard a dam as a vital and intelligent system. A bionics model is constructed to observe, diagnose and evaluate dam health. The model is composed of a sensing system (nerve), central processing unit (cerebrum) and decision-making implement (organism). In addition, the model, index system and engineering method on dam health assessment are presented. The proposed theories and methods are applied to evaluate dynamically the health of one concrete dam.

  19. Dam of Ksob (Algeria)

    Energy Technology Data Exchange (ETDEWEB)

    Stucky, J.P.

    1981-01-01

    Design of a sediment by-pass. The Ksob dam was heightened in 1977 in order to increase its storage capacity. A sediment derivation tunnel by-passing the reservoir was designed for a second stage. It will be operated during floods and is expected to delay significantly important storage losses due to reservoir sedimentation.

  20. Three Gorges Dam, China

    Science.gov (United States)

    2002-01-01

    This ASTER image shows a 60 km stretch of the Yangtze River in China, including the Xiling Gorge, the eastern of the three gorges. In the left part of the image is the construction site of the Three Gorges Dam, the world's largest.This image was acquired on July 20, 2000 by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite. With its 14 spectral bands from the visible to the thermal infrared wavelength region, and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), ASTER will image Earth for the next 6 years to map and monitor the changing surface of our planet.ASTER is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products. Dr. Anne Kahle at NASA's Jet Propulsion Laboratory, Pasadena, California, is the U.S. Science team leader; Bjorn Eng of JPL is the project manager. The Terra mission is part of NASA's Earth Science Enterprise, a long-term research and technology program designed to examine Earth's land, oceans, atmosphere, ice and life as a total integrated system.The broad spectral coverage and high spectral resolution of ASTER will provide scientists in numerous disciplines with critical information for surface mapping, and monitoring dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance.Size: 60 x 24 km (36 x 15 miles) Location: 30.6 deg. North lat., 111.2 deg. East long. Orientation: North at top Image Data: ASTER bands 1,2, and 3

  1. The design and construction of the Shikwamkwa replacement dam

    Energy Technology Data Exchange (ETDEWEB)

    Donnelly, C.R.; Rigbey, S.J.; Rigby, G. [Hatch Energy, Niagara Falls, ON (Canada); Clark, C. [Brookfield Power, Gatineau, PQ (Canada)

    2007-07-01

    The original Shikwamkwa dam was constructed in 1958 near Wawa, Ontario. It was a zoned earth-fill structure founded on a deep, central impervious core and complex overburden deposit. The primary defence against foundation seepage was a relatively short and thin impervious blanket constructed directly on the course grained river alluvium that was susceptible to piping. Serious incidents occurred shortly after impoundment in 1958, including the development of deep sinkholes in the reservoir, migration of fine particles through the foundation, and boiling at the downstream toe of the dam which continued to cause problems for decades. As the foundation was clearly deteriorated as evidenced by numerous sinkholes in the head pond and boils downstream, as well as concentrated seepage that had formed distinct pathways through the dam, a dam safety management plan was implemented in 1994 involving a phased program of remedial works designed to extend the life of this dam and to provide information on the nature of the problem and the foundation itself. This paper discussed the phased and managed approach for maintaining the safety of the Shikwamkwa dam. The paper provided detailed information on the remedial works program as well as the requirement for a new dam. Analysis of the changing hydrogeological conditions were done using a three-dimensional seepage model. Design and construction of the replacement dam, the use of enriched till in the embankment dam, the design of a plastic concrete cutoff wall, and the sealing between the cutoff wall and irregular bedrock surface using grouting were also outlined. Last, quality control for the cutoff wall and constructing dewatering were discussed. It was concluded that the project was successfully implemented following a fast track design and construction approach. 2 refs., 10 figs.

  2. STABILITAS CHECK DAM DI ARBORETUM DESA SUMBER BRANTAS

    Directory of Open Access Journals (Sweden)

    Endang Purwati

    2012-09-01

    Full Text Available Abstract: The stability of check-dam in arboretum of Sumber Brantas village. Sumber Brantas water sources area is arboretum territory which has to be maintained as conservation either for technical or vegetation (plants cover by sustainable development. Arboretum territory is made as asylum in irrigation system district of Brantas River. This research discusses technical conservation activity to build the check dam in conserving the area. Check dam is built dimensionally by using HEC-RAS Program to get safe and stable dimension for rolling, shifting and piping of Sf > 1.5, and based on hydrologic analysis to get maximum flood discharge of 48.01 m3second-1. Hydraulic analysis is used to get water level profile and pressure for the dam body. Stability of the structure will be controlled by construction load (weight of check dam and its fully sediment storage condition. The result of this research shows that the safe and stable dimension for check dam are as follows: 28 meter of width; 3 meter of main height; 1.5 meter of sub-height; 10 meter of stilling basin length (Main Dam–Sub Dam.

  3. Transport, dam passage, and size selection of adult Atlantic Salmon in the Penobscot River, Maine

    Science.gov (United States)

    Sigourney, Douglas B.; Zydlewski, Joseph D.; Hughes, Edward; Cox, Oliver

    2015-01-01

    Prior to 2012, returning adult Atlantic Salmon Salmo salar had to pass through fishways at three dams in the lower section of the Penobscot River, Maine: Veazie Dam (river kilometer [rkm] 48; removed in 2013), Great Works Dam (rkm 60; removed in 2012), and Milford Dam (rkm 62). To facilitate better passage through the lower river, a fish transport program was implemented in 2010 and 2011. Fish were captured at Veazie Dam and were either transported by truck above Milford Dam (TRKD group) or released into the head pond above Veazie Dam (run-of-the-river [ROR] group). To assess the efficacy of transport, we used PIT telemetry to compare the performance and passage of TRKD and ROR fish based on their (1) success in reaching one of the three dams upstream of Milford Dam, (2) time taken to reach an upstream dam (transit time), and (3) success in passing that upstream dam. In both years, the percentage of fish detected at upstream dams was higher for the TRKD group (82.4% in 2010; 78.6% in 2011) than for the ROR group (41.3% in 2010; 22.4% in 2011). In addition, median transit time was faster for TRKD fish (7 d in 2010; 5 d in 2011) than for ROR fish (23 d in 2010; 25 d in 2011). However, passage success through the upstream dams did not differ between the two release groups. Our analysis also revealed a strong, negative size-selective force on dam passage: larger fish were consistently less likely to successfully pass dams than smaller fish. Finally, environmental conditions also influenced passage success. Our analysis shows that the transport of adult Atlantic Salmon can be an effective means by which to increase migration success in systems where upstream passage is poor.

  4. National Dam Inspection Program. SCS PA 477 (NDS I.D. Number PA 00720, DER I.D. Number 6-457), Delaware River Basin, Tributary of Mill Creek. Berks County, Pennsylvania. Phase I Inspection Report,

    Science.gov (United States)

    1980-01-01

    is one of three dams built on the Kaercher Creek Watershed to provide flood protection to the Borough of Hamburg. 2 g. Design and Construction History...two single-purpose flood control dams and one multi-purpose dam which form the protection for the Kaercher Creek Watershed. Congress approved the...P1A""S - - _ _ 13 %;t- SCALE -r. KAERCHER CREEK WATERSHED PROJE FLOODWATER RETARDING DAM PA-47? AL 191(1- OFfitSERKS COUNTY,. PENNSYLVANA *1 tw( i

  5. Risk Perception Analysis Related To Existing Dams In Italy

    Science.gov (United States)

    Solimene, Pellegrino

    2013-04-01

    In the first part of this work, the progress of Italian National Rules about dams design, construction and operation are presented to highlight the strong connection existing between the promulgation of new decrees, as a consequence of a dam accidents, and the necessity to prevent further loss of lives and goods downstream. Following the Gleno Dam failure (1923), a special Ministerial Committee wrote out the first Regulations and made the proposal to establish, within the High Council of Public Works, a special department that become soon the "Dam Service", with the tasks of control and supervision about construction and operation phases of the dams and their reservoirs. A different definition of tasks and the structure of Dam Service were provided in accordance with law n° 183/1989, which transferred all the technical services to the Office of the Prime Minister; the aim was to join the Dam Office with the Department for National Technical Services, with the objective of increasing the knowledge of the territory and promoting the study on flood propagation downstream in case of operations on bottom outlet or hypothetical dam-break. In fact, population living downstream is not ready to accept any amount of risk because has not a good knowledge of the efforts of experts involved in dam safety, both from the operators and from the safety Authority. So it's important to optimize all the activities usually performed in a dam safety program and improve the emergency planning as a response to people's primary needs and feeling about safety from Civil Protection Authority. In the second part of the work, a definition of risk is provided as the relationship existing between probability of occurrence and loss, setting out the range within to plan for prevention (risk mitigation), thanks to the qualitative assessment of the minimum safety level that is suited to assign funds to plan for Civil Protection (loss mitigation). The basic meaning of the reliability of a zoned

  6. Damming evidence : Canada and the World Commission on Dams

    Energy Technology Data Exchange (ETDEWEB)

    Vert, P.; Parkinson, B.

    2003-06-01

    Large hydroelectric projects have been met with strong resistance from affected communities, particularly indigenous groups who have been displaced from their flooded communities following the damming of a river. The World Commission on Dams (WCD) was formed in 1998 to review the effectiveness of large dams and develop internationally acceptable guidelines and standards for large dams or hydro energy projects. The Canadian government, through the Canadian International Development Agency, was one of many governments to fund the WCD. However, the authors argue that despite the financial support, the Canadian government was absent from any effort to follow-up on the recommendations of the WCD. The seven strategic priorities in the decision making process include: (1) gaining public acceptance, (2) comprehensive option assessment of water, energy, food and development needs, (3) addressing existing dams to improve the benefits that can be derived from them, (4) sustaining livelihoods, (5) recognizing the entitlements and sharing benefits, (6) ensuring compliance, and (7) sharing rivers for peace, development and security. This report offers a means to assess planned or existing dams and presents a set of guidelines for good practices linked to the seven strategic priorities. Ten case studies from around the world were presented, including the Three Gorges Dam in China. 154 refs., 3 figs., 3 appendices.

  7. Landscape Evolution Modelling of naturally dammed rivers

    NARCIS (Netherlands)

    van Gorp, Wouter; Temme, Arnaud J. A. M.; Baartman, Jantiene E. M.; Schoorl, Jeroen M.

    2014-01-01

    Natural damming of upland river systems, such as landslide or lava damming, occurs worldwide. Many dams fail shortly after their creation, while other dams are long-lived and therefore have a long-term impact on fluvial and landscape evolution. This long-term impact is still poorly understood and

  8. 7 CFR 1724.55 - Dam safety.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 11 2010-01-01 2010-01-01 false Dam safety. 1724.55 Section 1724.55 Agriculture... § 1724.55 Dam safety. (a) The provisions of this section apply only to RUS financed electric system... for Dam Safety,”(Guidelines), as applicable. A dam, as more fully defined in the Guidelines, is...

  9. Big Lake Dam Inspection Report

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report summarizes an inspection of the Big Lake Dam that was done in September of 1983. The inspection did not reveal any conditions that constitute and...

  10. Ririe Dam Release Test Assessment

    Science.gov (United States)

    2013-06-01

    Notes HEC - RAS Location Station (ft) Observation Notes 1420 Ririe Dam Ririe Dam 119,880 Gates opened and initial release started. 1455 115th St...16°F air temperature. Table A2. Observations made on 11 February 2013. Time Location Notes HEC - RAS Location Station (ft) Observation Notes...ERDC/CRREL TR-13-10 52 Time Location Notes HEC - RAS Location Station (ft) Observation Notes Travel Time* (sec) Vel.** (fps) 1224 5th

  11. Facility Location Evaluation for Bonneville Dam Integrating Transmission, Study Area 77-2 : Draft Supplement to the Environmental Statement, Fiscal Year 1977 Proposed Program.

    Energy Technology Data Exchange (ETDEWEB)

    United States. Bonneville Power Administration.

    1976-01-22

    The overall construction and maintenance program in general, the Pacific Northwest Environment in which it operates, and the environmental impacts that typically occur from transmission line construction and maintenance activities are described. A framework for evaluation of specific proposals is provided. The need for a specific new transmission facility proposed as part of the Annual Proposed Program is identified and the probable environmental impact of constructing the facility in accordance with a general proposed system plan and alternative plans is outlined. This expands the facility planning supplement to include alternative locations for the proposed new facility and environmental impacts associated with each alternative location. This supplement was prepared after public and agency review of the final planning supplement had been completed and reconnaissance studies were made.

  12. Monitoring and Evaluation of Smolt Migration in the Columbia Basin : Volume IX : Evaluation of the 2001 Predictions of the Run-Timing of Wild and Hatchery-Reared Migrant Salmon and Steelhead Trout Migrating to Lower Granite, Rock Island, McNary, and John Day Dams using Program RealTime.

    Energy Technology Data Exchange (ETDEWEB)

    Burgess, Caitlin; Skalski, John R.

    2001-12-01

    Program RealTime provided tracking and forecasting of the 2001 inseason outmigration via the internet for eighteen PIT-tagged stocks of wild salmon and steelhead to Lower Granite and/or McNary dams and eleven passage-indexed stocks to Rock Island, McNary, or John Day dams. Nine of the PIT-tagged stocks tracked this year were new to the project. Thirteen ESUs of wild subyearling and yearling chinook salmon and steelhead, and one ESU of hatchery-reared sockeye salmon were tracked and forecasted to Lower Granite Dam. Eight wild ESUs of subyearling and yearling chinook salmon, sockeye salmon and steelhead were tracked to McNary Dam for the first time this year. Wild PIT-tagged ESUs tracked to Lower Granite Dam included yearling spring/summer chinook salmon release-recovery stocks (from Bear Valley Creek, Catherine Creek, Herd Creek, Imnaha River, Johnson Creek, Lostine River, Minam River, South Fork Salmon River, Secesh River, and Valley Creek), PIT-tagged wild runs-at-large of yearling chinook salmon and steelhead, and a PIT-tagged stock of subyearling fall chinook salmon. The stock of hatchery-reared PIT-tagged summer-run sockeye salmon smolts outmigrating to Lower Granite Dam, consisted this year of a new stock of fish from Alturas Lake Creek, Redfish Lake Creek Trap and Sawtooth Trap. The passage-indexed stocks, counted using FPC passage indices, included combined wild- and hatchery-reared runs-at-large of subyearling and yearling chinook, coho, and sockeye salmon, and steelhead migrating to Rock Island and McNary dams, and, new this year, combined wild and hatchery subyearling chinook salmon to John Day Dam. Unusual run-timing and fish passage characteristics were observed in this low-flow, negligible-spill migration year. The period for the middle 80% of fish passage (i.e., progress from the 10th to the 90th percentiles) was unusually short for nine out of ten PIT-tagged yearling spring/summer chinook salmon stocks tracked to Lower Granite Dam. It was the

  13. Conflicts Associated with Dam Removal in Sweden

    Directory of Open Access Journals (Sweden)

    Anna G. C. Lejon

    2009-12-01

    Full Text Available The increasing number of deteriorating old dams that need renovation or have lost their function make dam removal a viable management option. There are at least four major reasons for dam removal: safety, law and policy, economy, and ecology. Here we discuss 17 Swedish dams that were recently considered for removal. Because dam removal usually causes controversy, dam removal initiatives may succeed, fail, or result in a compromise such as a bypass channel for migrating fish. We identify and discuss three major obstructions to dam removal: funding, cultural-historical values, and threatened species. To facilitate dam removal, the reasons for, and the effects of, dam removal must be carefully explained, and the public and stakeholders must be kept informed. In complicated cases in which compromise solutions may be the most feasible outcome, the integration of the knowledge of different stakeholders is crucial. The involvement of diverse stakeholders increases their willingness to find compromises, thus avoiding conflicts and failures.

  14. Damming the rivers of the Amazon basin

    Science.gov (United States)

    Latrubesse, Edgardo M.; Arima, Eugenio Y.; Dunne, Thomas; Park, Edward; Baker, Victor R.; D'Horta, Fernando M.; Wight, Charles; Wittmann, Florian; Zuanon, Jansen; Baker, Paul A.; Ribas, Camila C.; Norgaard, Richard B.; Filizola, Naziano; Ansar, Atif; Flyvbjerg, Bent; Stevaux, Jose C.

    2017-06-01

    More than a hundred hydropower dams have already been built in the Amazon basin and numerous proposals for further dam constructions are under consideration. The accumulated negative environmental effects of existing dams and proposed dams, if constructed, will trigger massive hydrophysical and biotic disturbances that will affect the Amazon basin’s floodplains, estuary and sediment plume. We introduce a Dam Environmental Vulnerability Index to quantify the current and potential impacts of dams in the basin. The scale of foreseeable environmental degradation indicates the need for collective action among nations and states to avoid cumulative, far-reaching impacts. We suggest institutional innovations to assess and avoid the likely impoverishment of Amazon rivers.

  15. Seismic risk assessment for Poiana Uzului (Romania) buttress dam on Uz river

    Science.gov (United States)

    Moldovan, Iren-Adelina; Toma-Danila, Dragos; Paerele, Cosmin Marian; Emilian Toader, Victorin; Petruta Constantin, Angela; Ghita, Cristian

    2017-04-01

    The most important specific requirements towards dams' safety is the seismic risk assessment. This objective will be accomplished by rating the dams into seismic risk classes using the theory of Bureau and Ballentine, 2002, and Bureau (2003), taking into account the maximum expected peak ground motions at dams' site, the structures vulnerability and the downstream risk characteristics. The maximum expected values for ground motions at dams' site have been obtained using probabilistic seismic hazard assessment approaches. The structural vulnerability was obtained from dams' characteristics (age, high, water volume) and the downstream risk was assessed using human, economical, touristic, historic and cultural heritage information from the areas that might be flooded in the case of a dam failure. A couple of flooding scenarios have been performed. The results of the work consist of local and regional seismic information, specific characteristics of dam, seismic hazard values for different return periods and risk classes. The studies realized in this paper have as final goal to provide in the near future the local emergency services with warnings of a potential dam failure and ensuing flood as a result of a large earthquake occurrence, allowing further public training for evacuation. Acknowledgments This work was partially supported by the Partnership in Priority Areas Program - PNII, under MEN-UEFISCDI, DARING Project no. 69/2014 and the Nucleu Program - PN 16-35, Project no. 03 01 and 01 06.

  16. Douglas County Dam Breach Inundation Areas

    Data.gov (United States)

    Kansas Data Access and Support Center — Dam breach analysis provides a prediction of the extent and timing of flooding from a catastrophic breach of the dams. These results are sufficient for developing...

  17. Establishing baseline biodiversity data prior to hydroelectric dam construction to monitoring impacts to bats in the Brazilian Amazon

    OpenAIRE

    Bobrowiec, Paulo Estefano D.; Tavares, Val?ria da Cunha

    2017-01-01

    The modification of Amazonian rivers by the construction of megaprojects of hydroelectric dams has widely increased over the last decade. Robust monitoring programs have been rarely conducted prior to the establishment of dams to measure to what extent the fauna, and its associated habitats may be affected by upcoming impacts. Using bats as models, we performed analyses throughout the area under the influence of the Santo Ant?nio hydroelectric dam, Southwestern Brazilian Amazonia before its c...

  18. Dams life; La vie des barrages

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-12-31

    The paper reports on the conclusions of decennial and annual inspections of French dams. Dams surveillance is performed by the operators and consists in visual examinations and measurements. Concrete dams, in particular, always have more or less developed fissures with water sweating threw the concrete mass or the foundations. Old concrete often show low swelling phenomena which are measured too. (J.S.)

  19. Comparison of HEC-RAS with FLDWAV and DAMBRK models for dam break analysis

    Energy Technology Data Exchange (ETDEWEB)

    Zhou, R.D.; Judge, D.G.; Donnelly, C.R. [Acres International Ltd., Niagara Falls, ON (Canada)

    2004-09-01

    Dam break analysis is conducted as a routine dam safety assessment in determining the incremental hazard potential (IHP) that would occur in the event of a dam failure. Dam safety analysis also provides the information needed to make flood inundation maps and emergency preparedness plans (EPP) for dams that present a risk to human safety. For several years, the standard programs that have been used by the national weather service (NWS) for dam break flood simulation were the FLDWAV and DAMBRK models. However, another popular hydraulic model has been introduced. The HEC-RAS is an upgraded version of the former HEC-2 model used for the assessment of river floodplain inundation. A dam break analysis module has been added to HEC-2 and renamed the HEC-RAS which offers similar modeling capabilities to the DAMBRK and FLDWAV models for simulating flood hydrographs and flood wave propagation in river channels located downstream of a breached dam. The use of the alternative HEC-RAS could save time and resources. As such, it has the potential to replace the FLDWAV and DAMBRK. This paper compares the HEC-RAS dam break module with the FLDWAV and DAMBRK to determine if the new module accurately represents the dam break flood process. The comparison focuses on the theoretical background of the models, numerical solution techniques, ease of use of the module, modeling accuracy, practical aspects in performing dam break simulations, and capability for coupling the models with GIS for inundation mapping. The advantages and disadvantages of each model were summarized. 19 refs., 5 figs.

  20. National Dam Inspection Program. SCS PA-476 (NDS-I.D. Number PA 00719, DER I.D. Number 6-456), Delaware River Basin, Tributary of Mill Creek, Berks County, Pennsylvania. Phase I Inspection Report,

    Science.gov (United States)

    1980-01-01

    dam is flood control. This structure is one of three dams built in the Kaercher Creek Watershed to provide flood protection for the Borough of Hamburg...Water is also used for irrigation on the farm adjacent to the reservoir. g. Design and Construction History. The Kaercher Creek Watershed project...A..D jfdf ta.-. A7_ WXW Bla’ = 1aU. 79 w~~~~[1-- eiw wj ,Ul S"lF U*"-11 WV A4V*T 5- - -ow?" .~V L - * £. AV lfIAr Atrm rUw’wF lo w rjo KAERCHER

  1. Dam, Prof. Carl Peter Henrik

    Indian Academy of Sciences (India)

    ... Meetings · Public Lectures · Lecture Workshops · Refresher Courses · Symposia · Live Streaming. Home; Fellowship. Fellow Profile. Elected: 1965 Honorary. Dam, Prof. Carl Peter Henrik Nobel Laureate (Medicine) - 1943. Date of birth: 21 February 1895. Date of death: 17 April 1976. YouTube; Twitter; Facebook; Blog ...

  2. Research on Safety Factor of Dam Slope of High Embankment Dam under Seismic Condition

    Directory of Open Access Journals (Sweden)

    Li Bin

    2015-01-01

    Full Text Available With the constant development of construction technology of embankment dam, the constructed embankment dam becomes higher and higher, and the embankment dam with its height over 200m will always adopt the current design criteria of embankment dam only suitable for the construction of embankment dam lower than 200m in height. So the design criteria of high embankment dam shall be improved. We shall calculate the stability and safety factors of dam slope of high embankment dam under different dam height, slope ratio and different seismic intensity based on ratio of safety margin, and clarify the change rules of stability and safety factors of dam slope of high embankment dam with its height over 200m. We calculate the ratio of safety margin of traditional and reliable method by taking the stable, allowable and reliability index 4.2 of dam slope of high embankment dam with its height over 200m as the standard value, and conduct linear regression for both. As a result, the conditions, where 1.3 is considered as the stability and safety factors of dam slope of high embankment dam with its height over 200m under seismic condition and 4.2 as the allowable and reliability index, are under the same risk control level.

  3. Research on shape optimization of CSG dams

    Directory of Open Access Journals (Sweden)

    Xin Cai

    2011-12-01

    Full Text Available The multi-objective optimization method was used for shape optimization of cement sand and gravel (CSG dams in this study. The economic efficiency, the sensitivities of maximum horizontal displacement and maximum settlement of the dam to water level changes, the overall stability, and the overall strength security were taken into account during the optimization process. Three weight coefficient selection schemes were adopted to conduct shape optimization of a dam, and the case studies lead to the conclusion that both the upstream and downstream dam slope ratios for the optimal cross-section equal 1:0.7, which is consistent with the empirically observed range of 1:0.6 to 1:0.8 for the upstream and downstream dam slope ratios of CSG dams. Therefore, the present study is of certain reference value for designing CSG dams.

  4. Study of Dam-break Due to Overtopping of Four Small Dams in the Czech Republic

    Directory of Open Access Journals (Sweden)

    Zakaraya Alhasan

    2015-01-01

    Full Text Available Dam-break due to overtopping is one of the most common types of embankment dam failures. During the floods in August 2002 in the Czech Republic, several small dams collapsed due to overtopping. In this paper, an analysis of the dam break process at the Luh, Velký Bělčický, Melín, and Metelský dams breached during the 2002 flood is presented. Comprehensive identification and analysis of the dam shape, properties of dam material and failure scenarios were carried out after the flood event to assemble data for the calibration of a numerical dam break model. A simple one-dimensional mathematical model was proposed for use in dam breach simulation, and a computer code was compiled. The model was calibrated using the field data mentioned above. Comparison of the erodibility parameters gained from the model showed reasonable agreement with the results of other authors.

  5. Proceedings of the 2010 Canadian Dam Association's public safety around dams workshop

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-07-01

    Nearly 30 people have drowned in dam-related incidents over the last 10 years in Canada. The Canadian public is now calling for improved safety guidelines. Public interaction with dams is increasing as a result of interest in extreme sports and perceived rights of access. However, many members of the public are not aware of the dangers posed by dams. This workshop provided a forum to discuss proposals for a draft publication of the Canadian Dam Association (CDA) guidelines for public safety and security around dams. Issues related to current legislation and liability were discussed. Methods of increasing public awareness of the hazards posed by dams included increased signage in dam locations, the use of audible and visual alert systems, and the use of booms and buoys. The responsibilities of dam owners in ensuring the safety of dams were also discussed. The conference featured 5 presentations, of which 2 have been catalogued separately for inclusion in this database. tabs., figs.

  6. Minidoka Dam Wildlife Impact Assessment: Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Martin, Robert C.; Meuleman, G. Allyn

    1989-03-01

    A wildlife impact assessment has been developed for the US Bureau of Reclamation's Minidoka Dam and Reservoir in south central Idaho. This assessment was conducted to fulfill requirements of the Fish and Wildlife Program. Specific objectives of this study included the following: select target wildlife species, and identify their current status and management goals; estimate the net effects on target wildlife species resulting from hydroelectric development and operation; recommend protection, mitigation, and enhancement goals for target wildlife species affected by hydroelectric development and operation; and consult and coordinate impact assessment activities with the Northwest Power Planning Council, Bonneville Power Administration, US Bureau of Reclamation, Bureau of Land Management, Shoshone-Bannock Tribes, US Fish and Wildlife Service, Pacific Northwest Utilities Conference Committee, and other entities expressing interest in the project. 62 refs., 2 figs., 11 tabs.

  7. Effects of dam nutrition on growth and reproductive performance of heifer calves.

    Science.gov (United States)

    Martin, J L; Vonnahme, K A; Adams, D C; Lardy, G P; Funston, R N

    2007-03-01

    similar ages at puberty and similar proportions of heifers cycling before the breeding season, a greater proportion of heifers from PS dams calved in the first 21 d of the heifers' first calving season, and pregnancy rates were greater compared with heifers from NS dams. Collectively, these results provide evidence of a fetal programming effect on heifer postweaning BW and fertility.

  8. Brazil's Amazonian dams: Ecological and socioeconomic impacts

    Science.gov (United States)

    Fearnside, P. M.

    2016-12-01

    Brazil's 2015-2024 Energy Expansion Plan calls for 11 hydroelectric dams with installed capacity ≥ 30 MW in the country's Amazon region. Dozens of other large dams are planned beyond this time horizon, and dams with consumers. Population displacement is a major impact; for example, the Marabá Dam would displace 40,000 people, mostly traditional riverside dwellers (ribeirinhos). Various dams impact indigenous peoples, such as the Xingu River dams (beginning with Belo Monte) and the São Luiz do Tapajós and Chacorão Dams on the Tapajós River. Brazil has many energy options other than dams. Much energy use has little benefit for the country, such as exporting aluminum. Electric showerheads use 5% of the country's power. Losses in transmission lines (20%) are far above global averages and can be expected to increase as Amazonian hydroelectric dams far from consumer centers come on line. Brazil has tremendous wind and solar potential, but these do not have the same priority as dams. At the root of many questionable policies is a decision-making process in need of reform.

  9. Repair, Evaluation, Maintenance, and Rehabilitation Research Program: Proceedings of REMR Workshop on New Remedial Seepage Control Methods for Embankment-Dams and Soil Foundations Held in Vicksburg, Mississippi on 21-22 October 1986.

    Science.gov (United States)

    1988-01-01

    Proceedings nf REMR Workshop on New Remedial Seepage Control methods for Embankment-Dams and Soil Forindarions 12 PERSONA , AUTH~OR(S) Perry, Edward B., Compiler...I eci wi th ouite d’.versit ied soil-types lvii, ak r:oMixed s trata of crregula’. di-ensions to a depth of app-roxi- rat’ aVn1e thle tipper sun’. ace

  10. Exporting dams: China's hydropower industry goes global.

    Science.gov (United States)

    McDonald, Kristen; Bosshard, Peter; Brewer, Nicole

    2009-07-01

    In line with China's "going out" strategy, China's dam industry has in recent years significantly expanded its involvement in overseas markets. The Chinese Export-Import Bank and other Chinese financial institutions, state-owned enterprises, and private firms are now involved in at least 93 major dam projects overseas. The Chinese government sees the new global role played by China's dam industry as a "win-win" situation for China and host countries involved. But evidence from project sites such as the Merowe Dam in Sudan demonstrates that these dams have unrecognized social and environmental costs for host communities. Chinese dam builders have yet to adopt internationally accepted social and environmental standards for large infrastructure development that can assure these costs are adequately taken into account. But the Chinese government is becoming increasingly aware of the challenge and the necessity of promoting environmentally and socially sound investments overseas.

  11. Measurement of Dam Deformations: Case Study of Obruk Dam (Turkey)

    Science.gov (United States)

    Gulal, V. Engin; Alkan, R. Metin; Alkan, M. Nurullah; İlci, Veli; Ozulu, I. Murat; Tombus, F. Engin; Kose, Zafer; Aladogan, Kayhan; Sahin, Murat; Yavasoglu, Hakan; Oku, Guldane

    2016-04-01

    In the literature, there is information regarding the first deformation and displacement measurements in dams that were conducted in 1920s Switzerland. Todays, deformation measurements in the dams have gained very different functions with improvements in both measurement equipment and evaluation of measurements. Deformation measurements and analysis are among the main topics studied by scientists who take interest in the engineering measurement sciences. The Working group of Deformation Measurements and Analysis, which was established under the International Federation of Surveyors (FIG), carries out its studies and activities with regard to this subject. At the end of the 1970s, the subject of the determination of fixed points in the deformation monitoring network was one of the main subjects extensively studied. Many theories arose from this inquiry, as different institutes came to differing conclusions. In 1978, a special commission with representatives of universities has been established within the FIG 6.1 working group; this commission worked on the issue of determining a general approach to geometric deformation analysis. The results gleaned from the commission were discussed at symposiums organized by the FIG. In accordance with these studies, scientists interested in the subject have begun to work on models that investigate cause and effect relations between the effects that cause deformation and deformation. As of the scientist who interest with the issue focused on different deformation methods, another special commission was established within the FIG engineering measurements commission in order to classify deformation models and study terminology. After studying this material for a long time, the official commission report was published in 2001. In this prepared report, studies have been carried out by considering the FIG Engineering Surveying Commission's report entitled, 'MODELS AND TERMINOLOGY FOR THE ANALYSIS OF GEODETIC MONITORING OBSERVATIONS

  12. Global Reservoir and Dam Database, Version 1 (GRanDv1): Dams, Revision 01

    Data.gov (United States)

    National Aeronautics and Space Administration — The Global Reservoir and Dam Database, Version 1 (Revision 01) contains 6,862 records of reservoirs and their associated dams with a cumulative storage capacity of...

  13. Global Reservoir and Dam Database, Version 1 (GRanDv1): Dams, Revision 01

    Data.gov (United States)

    National Aeronautics and Space Administration — The Global Reservoir and Dam Database, Version 1, Revision 01 (v1.01) contains 6,862 records of reservoirs and their associated dams with a cumulative storage...

  14. Dam failure analysis for the Lago de Matrullas Dam, Orocovis, Puerto Rico

    Science.gov (United States)

    Torres-Sierra, Heriberto; Gómez-Fragoso, Julieta

    2015-01-01

    The U.S. Geological Survey, in cooperation with the Puerto Rico Electric Power Authority, completed a hydrologic and hydraulic study to assess the potential hazard to human life and property associated with the hypothetical failure of the Lago de Matrullas Dam, located within the headwaters of the Río Grande de Manatí. The hydrologic study yielded outflow hydrographs and peak discharges for Lago de Matrullas and other subbasins in the Río Grande de Manatí hydrographic basin for three extreme rainfall events: (1) a 6-hour probable maximum precipitation (PMP) event, (2) a 24-hour PMP event, and (3) a 100-year-recurrence, 24-hour rainfall event. The hydraulic study simulated the hypothetical dam failure of Lago de Matrullas using hypothetical flood hydrographs generated from the hydrologic study and selected dam breach parameters. The flood wave resulting from the failure was downstream-routed through the lower reaches of the Río Matrullas, the Río Toro Negro, and the Río Grande de Manatí for determination of water-surface profiles developed from the event-based hydrologic scenarios and “sunny day” (no precipitation) conditions. The Hydrologic Modeling System (HEC–HMS) and the River Analysis System (HEC–RAS) computer programs, developed by the Hydrologic Engineering Center (HEC) of the U.S. Army Corps of Engineers, were used for the hydrologic and hydraulic modeling, respectively. The flow routing in the hydraulic analyses was performed using the unsteady-state flow module available in the HEC–RAS model.

  15. A simplified water temperature model for the Colorado River below Glen Canyon Dam

    Science.gov (United States)

    Wright, S.A.; Anderson, C.R.; Voichick, N.

    2009-01-01

    Glen Canyon Dam, located on the Colorado River in northern Arizona, has affected the physical, biological and cultural resources of the river downstream in Grand Canyon. One of the impacts to the downstream physical environment that has important implications for the aquatic ecosystem is the transformation of the thermal regime from highly variable seasonally to relatively constant year-round, owing to hypolimnetic releases from the upstream reservoir, Lake Powell. Because of the perceived impacts on the downstream aquatic ecosystem and native fish communities, the Glen Canyon Dam Adaptive Management Program has considered modifications to flow releases and release temperatures designed to increase downstream temperatures. Here, we present a new model of monthly average water temperatures below Glen Canyon Dam designed for first-order, relatively simple evaluation of various alternative dam operations. The model is based on a simplified heat-exchange equation, and model parameters are estimated empirically. The model predicts monthly average temperatures at locations up to 421 km downstream from the dam with average absolute errors less than 0.58C for the dataset considered. The modelling approach used here may also prove useful for other systems, particularly below large dams where release temperatures are substantially out of equilibrium with meteorological conditions. We also present some examples of how the model can be used to evaluate scenarios for the operation of Glen Canyon Dam.

  16. A ravenous river reclaims its true course: the tale of Marmot Dam''s demise

    Science.gov (United States)

    Noreen Parks; Gordon Grant

    2009-01-01

    Removing dams that are outdated, unsafe, or pose significant economic or environmental costs has emerged in the last 10 years as a major river restoration strategy. The removal of the 45-foot-high Marmot Dam on the Sandy River in 2007 resulted in the biggest sediment release accompanying any dam removal to date. It also provided an unprecedented opportunity...

  17. Patients' attitudes to rubber dam.

    Science.gov (United States)

    Stewardson, D A; McHugh, E S

    2002-10-01

    The aims of this study were to record patients' views of their experience of RD use in an objective manner, and to evaluate the influence of some personal and clinical factors on patients' opinion. A questionnaire was designed which was then distributed to patients receiving dental treatment under RD by (a) final-year dental students at Birmingham Dental School, and (b) general dental practitioners. Patients completed the confidential questionnaire anonymously after treatment, outside the treatment room. After 100 correctly completed forms were collected from group (a) and 106 from group (b), data were entered into a database and subsequently analyzed using SPSS. Analyses were confined to simple cross-tabulations of the patients' responses and potential associated factors, with chi-square analysis and appropriate follow-up comparisons wherever necessary. In both groups, the majority of patients said they would prefer RD to be used at their next appointment, and most had a positive opinion of the experience. No statistically significant association between age, sex, procedure, application time or duration of use and preference for rubber dam was found. Prolonged RD use showed some association with a negative opinion of the experience of RD. Compared with the dentists, students took longer to apply rubber dam and it was in place for longer. Fewer student patients preferred RD next time, and were less positive about its use than the dentists' patients. Further evidence is presented that (i) Patients generally are not averse to RD. (ii) Placement of rubber dam does not take long. (iii) Operator experience improves patient compliance.

  18. Safety Aspects of Sustainable Storage Dams and Earthquake Safety of Existing Dams

    Directory of Open Access Journals (Sweden)

    Martin Wieland

    2016-09-01

    Full Text Available The basic element in any sustainable dam project is safety, which includes the following safety elements: ① structural safety, ② dam safety monitoring, ③ operational safety and maintenance, and ④ emergency planning. Long-term safety primarily includes the analysis of all hazards affecting the project; that is, hazards from the natural environment, hazards from the man-made environment, and project-specific and site-specific hazards. The special features of the seismic safety of dams are discussed. Large dams were the first structures to be systematically designed against earthquakes, starting in the 1930s. However, the seismic safety of older dams is unknown, as most were designed using seismic design criteria and methods of dynamic analysis that are considered obsolete today. Therefore, we need to reevaluate the seismic safety of existing dams based on current state-of-the-art practices and rehabilitate deficient dams. For large dams, a site-specific seismic hazard analysis is usually recommended. Today, large dams and the safety-relevant elements used for controlling the reservoir after a strong earthquake must be able to withstand the ground motions of a safety evaluation earthquake. The ground motion parameters can be determined either by a probabilistic or a deterministic seismic hazard analysis. During strong earthquakes, inelastic deformations may occur in a dam; therefore, the seismic analysis has to be carried out in the time domain. Furthermore, earthquakes create multiple seismic hazards for dams such as ground shaking, fault movements, mass movements, and others. The ground motions needed by the dam engineer are not real earthquake ground motions but models of the ground motion, which allow the safe design of dams. It must also be kept in mind that dam safety evaluations must be carried out several times during the long life of large storage dams. These features are discussed in this paper.

  19. Key Impact Factors on Dam Break Fatalities

    Science.gov (United States)

    Huang, D.; Yu, Z.; Song, Y.; Han, D.; Li, Y.

    2016-12-01

    Dam failures can lead to catastrophes on human society. However, there is a lack of research about dam break fatalities, especially on the key factors that affect fatalities. Based on the analysis of historical dam break cases, most studies have used the regression analysis to explore the correlation between those factors and fatalities, but without implementing optimization to find the dominating factors. In order to understand and reduce the risk of fatalities, this study has proposed a new method to select the impact factors on the fatality. It employs an improved ANN (Artificial Neural Network) combined with LOOCV (Leave-one-out cross-validation) and SFS (Stepwise Forward Selection) approach to explore the nonlinear relationship between impact factors and life losses. It not only considers the factors that have been widely used in the literature but also introduces new factors closely involved with fatalities. Dam break cases occurred in China from 1954 to 2013 are summarized, within which twenty-five cases are selected with a comprehensive coverage of geographic position and temporal variation. Twelve impact factors are taken into account as the inputs, i.e., severity of dam break flood (SF), population at risk (PR), public understanding of dam break (UB), warning time (TW), evacuation condition (EC), weather condition during dam break (WB), dam break mode (MB), water storage (SW), building vulnerability (VB), dam break time (TB), average distance from the affected area to the dam (DD) and preventive measures by government (PG).From those, three key factors of SF, MB and TB are chosen. The proposed method is able to extract the key factors, and the derived fatality model performs well in various types of dam break conditions.

  20. SUITABILITY OF DAM SITES IN MAURITIUS

    African Journals Online (AJOL)

    cistvr

    Sites where dams/reservoirs have been proposed in Mauritius are listed in Table 1. In many of these places, detailed investigations have been carried out, only to be shelved for some reason or other. Other dams have been constructed, sometimes after a sketchy desk study investigation, simply because of the urgency of ...

  1. 75 FR 62024 - Metal and Nonmetal Dams

    Science.gov (United States)

    2010-10-07

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF LABOR Mine Safety and Health Administration 30 CFR Parts 56 and 57 RIN 1219-AB70 Metal and Nonmetal Dams AGENCY... measures to assure that metal and nonmetal mine operators design, construct, operate and maintain dams in a...

  2. SEDIMENT MANAGEMENT IN FLOOD CONTROL DAMS

    OpenAIRE

    Pattanapanchai, Maneechit; Shah, Farhed A.; Annandale, George

    2002-01-01

    Reservoir sedimentation reduces economic value and longevity of flood control dams. Periodic sediment removal allows extension of reservoir life. An optimal control model is developed to evaluate alternative sediment management strategies for flood control dams. An illustrative empirical analysis shows that sustainable management is economically desirable for a wide range of parameter values.

  3. Restoring Environmental Flows by Modifying Dam Operations

    Directory of Open Access Journals (Sweden)

    Brian D. Richter

    2007-06-01

    Full Text Available The construction of new dams has become one of the most controversial issues in global efforts to alleviate poverty, improve human health, and strengthen regional economies. Unfortunately, this controversy has overshadowed the tremendous opportunity that exists for modifying the operations of existing dams to recover many of the environmental and social benefits of healthy ecosystems that have been compromised by present modes of dam operation. The potential benefits of dam "re-operation" include recovery of fish, shellfish, and other wildlife populations valued both commercially and recreationally, including estuarine species; reactivation of the flood storage and water purification benefits that occur when floods are allowed to flow into floodplain forests and wetlands; regaining some semblance of the naturally dynamic balance between river erosion and sedimentation that shapes physical habitat complexity, and arresting problems associated with geomorphic imbalances; cultural and spiritual uses of rivers; and many other socially valued products and services. This paper describes an assessment framework that can be used to evaluate the benefits that might be restored through dam re-operation. Assessing the potential benefits of dam re-operation begins by characterizing the dam's effects on the river flow regime, and formulating hypotheses about the ecological and social benefits that might be restored by releasing water from the dam in a manner that more closely resembles natural flow patterns. These hypotheses can be tested by implementing a re-operation plan, tracking the response of the ecosystem, and continually refining dam operations through adaptive management. The paper highlights a number of land and water management strategies useful in implementing a dam re-operation plan, with reference to a variety of management contexts ranging from individual dams to cascades of dams along a river to regional energy grids. Because many of the

  4. Research progress on dam-break floods

    KAUST Repository

    Wu, Jiansong

    2011-08-01

    Because of the catastrophic effects downstream of dam-break failure, more and more researchers around the world have been working on the study of dam-break flows to accurately forecast the downstream inundation mapping. With the rapid development of computer hardware and computing techniques, numerical study on dam-break flows has been a popular research subject. In the paper, the numerical methodologies used to solve the governing partial differential equations of dam-break flows are classified and summarized, and their characteristics and applications are discussed respectively. Furthermore, the fully-developed mathematical models developed in recent decades are reviewed, and also introduced the authors\\' on-going work. Finally, some possible future developments on modeling the dam-break flows and some solutions are presented and discussed. © 2011 IEEE.

  5. Do we need construct more dams?

    Science.gov (United States)

    Chen, J.; Shi, H.

    2013-12-01

    This paper reviews global dam development in association with the growths of global population, economy, and energy consumption in the past several decades, and also evaluates contributions of dam development to future world sustainable development. Eventually, this paper answers whether we need more dams in the future or not. The world population has rapidly increased from 1.6 billion in 1900, 2.5 billion in 1950, 6.1 billion in 2000, to 7.0 billion in 2011, and is projected to reach 9.5 billion in 2050; similarly, the world economy has dramatically expanded. To maintain socioeconomic development, the consumption of water, food and energy has increased rapidly as well. However, the total volume of available water resource over the world is limited, the food production largely depends on water supply, and the main energy sources are still oil, coal and gas at present, which are regarded as non-renewable resources. Accordingly, it is expected that we will face serious problems to deal with the challenges of water crisis, food security and energy shortage in the near future. In order to enhance the capability of regulating water resource, a great number of global dams (and related reservoirs) have been constructed in the last one hundred years; currently, almost all large rivers over the world have been regulated by dams. The reservoirs can supply sufficient water for irrigated land to ensure food production, and the associated hydropower stations can generate electricity. This article collects the dam data from the ICOLD (International Commission on Large Dams) and GRanD (Global Reservoir and Dam) databases, and some socioeconomic data, including population, economy, and consumptions of water, food and energy over the world. Analysis of these data reveals that global dam development has a great impact on the world sustainable development. Further, it is concluded that we need further dam development to maintain our future development.

  6. Deformation Monitoring and Bathymetry Analyses in Rock-Fill Dams, a Case Study at Ataturk Dam

    Science.gov (United States)

    Kalkan, Y.; Bilgi, S.

    2014-12-01

    Turkey has 595 dams constructed between 1936 and 2013 for the purposes of irrigation, flood control, hydroelectric energy and drinking water. A major portion of the dam basins in Turkey are deprived of vegetation and have slope topography on near surrounding area. However, landscaping covered with forest around the dam basin is desirable for erosion control. In fact; the dams, have basins deprived of vegetation, fill up quickly due to sediment transport. Erosion control and forestation are important factors, reducing the sediment, to protect the water basins of the dams and increase the functioning life of the dams. The functioning life of dams is as important as the investment and construction. Nevertheless, in order to provide safety of human life living around, well planned monitoring is essential for dams. Dams are very large and critical structures and they demand the use or application of precise measuring systems. Some basic physical data are very important for assessing the safety and performance of dams. These are movement, water pressure, seepage, reservoir and tail-water elevations, local seismic activities, total pressure, stress and strain, internal concrete temperature, ambient temperature and precipitation. Monitoring is an essential component of the dam after construction and during operation and must en­able the timely detection of any behavior that could deteriorate the dam, potentially result in its shutdown or failure. Considering the time and labor consumed by long-term measurements, processing and analysis of measured data, importance of the small structural motions at regular intervals could be comprehended. This study provides some information, safety and the techniques about the deformation monitoring of the dams, dam safety and related analysis. The case study is the deformation measurements of Atatürk Dam in Turkey which is the 6th largest dam of world considering the filling volume of embankment. Brief information is given about the

  7. TYPOLOGY OF LARGE DAMS. A REVIEW

    Directory of Open Access Journals (Sweden)

    Gheorghe ROMANESCU

    2015-06-01

    Full Text Available The dams represent hydrotechnical constructions meant to ensure a judicious use of water resources. The international literature is extremely rich in data regarding the large dams on Earth. In this context, a hierarchy of the main dams is attempted and the role they play in the economic development of the regions they were built in is underlined. The largest dams are built on the big rivers in Asia, North America, South America and Africa. The reservoirs have multiple roles: electricity production, drinking or industrial water supply, irrigations, recreation, etc. High costs and land fragility do not allow the construction of dams in the places most affected by drought or flood. This is why they are usually built in mountainous areas, at great distance from the populated centres. On the Romanian territory, there are 246 large dams, built in the hydrographical basins of Siret, Olt, Arges, Somes, etc. The largest rivers on Earth, by discharge, (Amazon and Zair do not also include the largest dams because the landform and the type of flow have not allowed such constructions.

  8. Investigation of quality of storage dam in Ilam, identifying of pollutant resources and pollutants attitude

    Directory of Open Access Journals (Sweden)

    Moayed Avazpour

    2013-12-01

    Full Text Available Water quality of dam storage is highly affected by upstream environment and basin. Regarding other conducted studies, there exist various reasons such as some studies and general monitoring of dams which cause some main problems including salinity, chemical and microbial pollution eutrophication, and sedimentation. Chame-Gerdalan storage dam in Ilam Province is one of the storages which have many environmental issues because of discharge upstream rural wastewaters, animal excreta, agricultural drainage, and leachate. The aim of this study is to signify the quality of Ilam’s storage dam and also to recognize the pollutant resources and to analyze the pollutants’ behavior at different times and sites in order to determine dam properties for agricultural and domestic usages. Regarding the importance of the topic, the present study (in the year 2012 is based on the collected information of water quality of the basin, recognition of pollutant resources and measurement of qualitative parameters such as temperature, TDS, EC, BOD5, COD, nitrogen, phosphor, and pH in seven periods of time (from May to November. The results show that the total increase in the concentration of all variables along the basin are over double, in particular, Nitrat, Sulfat, BOD, and COD. After analyzing data with some water quality indexes, we analyzed water quality of the storage and some strategies were applied in order to control the effect decrease in the dam storage which, a management program was presented to improve water quality.

  9. Geophysics Methods in Electrometric Assessment of Dams

    Energy Technology Data Exchange (ETDEWEB)

    Davydov, V. A., E-mail: davydov-va@yandex.ru; Baidikov, S. V., E-mail: badikek@mail.ru; Gorshkov, V. Yu., E-mail: vitalaa@yandex.ru; Malikov, A. V., E-mail: alex.mal.1986@mail.ru [Russian Academy of Sciences, Geophysical Institute, Ural Branch (Russian Federation)

    2016-07-15

    The safety assessment of hydraulic structures is proposed to be conducted via geoelectric measurements, which are capable of assessing the health of earth dams in their natural bedding without intervention in their structure. Geoelectric measurements are shown as being capable of pinpointing hazardous parts of a dam, including areas of elevated seepage. Applications of such methods are shown for a number of mini-dams in the Sverdlovsk region. Aparameter (effective longitudinal conductivity) that may be used to monitor the safety of hydraulic structures is proposed. Quantitative estimates of this parameter are given in terms of the degree of safely.

  10. Sustainability of dams-an evaluation approach

    Science.gov (United States)

    Petersson, E.

    2003-04-01

    Situated in the stream bed of a river, dams and reservoirs interrupt the natural hydrological cycle. They are very sensitive to all kinds of changes in the catchment, among others global impacts on land use, climate, settlement structures or living standards. Vice versa dams strongly affect the spatially distributed, complex system of ecology, economy and society in the catchment both up- and downstream of the reservoir. The occurrence of negative impacts due to large dams led to serious conflicts about future dams. Nevertheless, water shortages due to climatic conditions and their changes, that are faced by enormous water and energy demands due to rising living standards of a growing world population, seem to require further dam construction, even if both supply and demand management are optimised. Although environmental impact assessments are compulsory for dams financed by any of the international funding agencies, it has to be assumed that the projects lack sustainability. Starting from an inventory of today's environmental impact assessments as an integral part of a feasibility study the presentation will identify their inadequacies with regard to the sustainability of dams. To improve the sustainability of future dams and avoid the mistakes of the past, the planning procedures for dams have to be adapted. The highly complex and dynamical system of interrelated physical and non-physical processes, that involves many different groups of stakeholders, constitutes the need for a model-oriented decision support system. In line with the report of the World Commission of Dams an integrated analysis and structure of the complex interrelations between dams, ecology, economy and society will be presented. Thus the system, that a respective tool will be based on, is analysed. Furthermore an outlook will be given on the needs of the potential users of a DSS and how it has to be embedded in the overall planning process. The limits of computer-based decision-support in the

  11. Predictions of total deformations in Jebba main dam by finite ...

    African Journals Online (AJOL)

    This paper examined the deformations of the Jebba Main Dam, Jebba Nigeria using the finite element method. The study also evaluated the predicted deformations and compared them with the actual deformations in the dam to identify possible causes of the observed longitudinal crack at the dam crest. The Jebba dam is a ...

  12. Dam break analysis and flood inundation map of Krisak dam for emergency action plan

    Science.gov (United States)

    Juliastuti, Setyandito, Oki

    2017-11-01

    The Indonesian Regulation which refers to the ICOLD Regulation (International Committee on Large Dam required have the Emergency Action Plan (EAP) guidelines because of the dams have potential failure. In EAP guidelines there is a management of evacuation where the determination of the inundation map based on flood modeling. The purpose of the EAP is to minimize the risk of loss of life and property in downstream which caused by dam failure. This paper will describe about develop flood modeling and inundation map in Krisak dam using numerical methods through dam break analysis (DBA) using hydraulic model Zhong Xing HY-21. The approaches of dam failure simulation are overtopping and piping. Overtopping simulation based on quadrangular, triangular and trapezium fracture. Piping simulation based on cracks of orifice. Using results of DBA, hazard classification of Krisak dam is very high. The nearest village affected dam failure is Singodutan village (distance is 1.45 kilometer from dam) with inundation depth is 1.85 meter. This result can be used by stakeholders such as emergency responders and the community at risk in formulating evacuation procedure.

  13. 33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Marshall Ford Dam and Reservoir... Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. The Secretary of the Interior, through his agent, the Lower Colorado River Authority (LCRA) shall operate the Marshall Ford Dam...

  14. Physical - Elwha River Dam Removal Study

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study examines the ecosystem response of the Elwha River to the removal of the Elwha River dams. We will measure the following attributes of ecosystem response:...

  15. Dams life; La vie des barrages

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-31

    This paper summarizes the conclusions of the annual inspections of French dams in operation (fissures, water oozing, concrete swelling etc..). Only the observations which require a special attention are reported. (J.S.)

  16. Chemical - Elwha River Dam Removal Study

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study examines the ecosystem response of the Elwha River to the removal of the Elwha River dams. We will measure the following attributes of ecosystem response:...

  17. Biological - Elwha River Dam Removal Study

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study examines the ecosystem response of the Elwha River to the removal of the Elwha River dams. We will measure the following attributes of ecosystem response:...

  18. Final Design Analysis : Lake Ladora Dam Repair

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report is intended to present Rocky Mountain Arsenal with details concerning the remedial repair for Ladora Dam to meet the geotechnical concerns and hydrologic...

  19. Technical bulletin : geotechnical considerations for dam safety

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

    The safety of dams requires a thorough understanding of the geotechnical elements of dam design. This technical bulletin outlined methods for conducting geotechnical assessments as part of dam safety analyses. It included an overview of methods for minimizing and control seepage, as well as preventing internal and surface erosion. Geotechnical considerations for foundation, abutments, and reservoir bank slope conditions were also presented. Geotechnical safety assessment techniques were presented for earthfill, embankment, and rockfill dams. Appurtenant structures, reservoir rims, and foundations were examined. Hazards and failure modes included overtopping, internal erosion, slope instability, and earthquake liquefaction. Foundation irregularities and surface erosion assesment methods were presented. Geotechnical considerations for loading conditions, shear strength, discontinuities, compatibilities, foundation permeability, and foundation compressibility were presented along with analysis, design, and remedial considerations. 53 refs., 6 tabs.

  20. Repair and Rehabilitation of Dams: Case Studies

    Science.gov (United States)

    1999-09-01

    were grouted. In 1958, the entire downstream face of the dam was resurfaced with gunite, and wrought iron nosing was installed on the gatehouse intake...Cpm (32 gpm), virtually all of which was entering the gallery through vertical roof drains and fissures well above the levels grouted. The concrete...long center con- crete gravity dam contains a 12-m- (40-ft-) long gatehouse structure and a 73.5-m- (41-ft-) long flashboard regulated spillway

  1. Wind-Driven Ecological Flow Regimes Downstream from Hydropower Dams

    Science.gov (United States)

    Kern, J.; Characklis, G. W.

    2012-12-01

    challenge, the following study was designed to investigate the potential for wind power integration to alter riparian flow regimes below hydroelectric dams. A hydrological model of a three-dam cascade in the Roanoke River basin (Virginia, USA) is interfaced with a simulated electricity market (i.e. a unit commitment problem) representing the Dominion Zone of PJM Interconnection. Incorporating forecasts of electricity demand, hydro capacity and wind availability, a mixed-integer optimization program minimizes the system cost of meeting hourly demand and reserve requirements by means of a diverse generation portfolio (e.g. nuclear, fossil, hydro, and biomass). A secondary 'balancing' energy market is executed if real-time wind generation is less than the day-ahead forecast, calling upon reserved generation resources to meet the supply shortfall. Hydropower release schedules are determined across a range of wind development scenarios (varying wind's fraction of total installed generating capacity, as well as its geographical source region). Flow regimes for each wind development scenario are compared against both historical and simulated flows under current operations (negligible wind power), as well as simulated natural flows (dam removal), in terms of ecologically relevant flow metrics. Results quantify the ability of wind power development to alter within-week stream flows downstream from hydropower dams.

  2. Crosshole seismic tomography across a masonry dam

    Science.gov (United States)

    Wong, Joe

    1995-05-01

    An intensive crosshole seismic survey was done across a 700-foot-long stone-masonry dam. It involved measurements on six connected panels each approximately 100 feet in width extending completely across the dam from abutment to abutment. The objective was to provide tomographic images of P-wave velocity and dynamic elastic moduli of the dam and foundation materials along the axis of the dam. Field seismograms were recorded with an airgun source and hydrophone detectors. Data analysis included interactive time-picking, plotting of common source gathers, and tomographic imaging using an iterative back-propagation technique. Color-coded tomograms of velocity and dynamic Young's modulus were produced and correlated with geological and geophysical data measured on drill core samples. Low values of velocity and dynamic elastic modulus correlated with low RQD and high fracture frequency. The tomograms showed significant variations of mechanical properties in the stone masonry dam and its foundation. The colored tomograms were useful in highlighting zones of weak rock possibly requiring remedial action. They also assisted engineering evaluation of the dam by providing a detailed two-dimensional distribution of mechanical properties which can be used as ground truth data for numerical modeling of stress-strain fields.

  3. Estimating flood inundation caused by dam failures

    Energy Technology Data Exchange (ETDEWEB)

    Mocan, N. [Crozier and Associates Inc., Collingwood, ON (Canada); Joy, D.M. [Guelph Univ., ON (Canada). School of Engineering; Rungis, G. [Grand River Conservation Authority, Cambridge, ON (Canada)

    2006-01-15

    Recent advancements in modelling inundation due to dam failures have allowed easier and more illustrative analyses of potential outcomes. This paper described new model and mapping capabilities available using the HEC-RAS hydraulic model in concert with geographic information systems (GIS). The study area was the upper reaches of Canagagigue Creek and the Woolwich Dam near Elmira, Ontario. A hydraulic analysis of a hypothetical dam failure was developed based on the summer probable maximum flood (PMF) event. Limits extended from Woolwich Dam to downstream of the Town of Elmira. An incoming summer PMF hydrograph was set as the upstream boundary condition in the upstream model. Simulation parameters include simulation time-step; implicit weighting factor; water surface calculation tolerance; and output calculation interval. Peak flows were presented, as well as corresponding flood inundation results through the Town of Elmira. The hydraulic model results were exported to a GIS in order to develop inundation maps for emergency management planning. Results from post-processing included inundation maps for each of the simulated time-steps as well as an inundation animation for the duration of the dam breach. It was concluded that the modelling tools presented in the study can be applied to other dam safety assessment projects in order to develop effective and efficient emergency preparedness plans through public consultation and the establishment of impact zones. 1 tab., 2 figs.

  4. Geodetic deformation monitoring at Pendidikan Diponegoro Dam

    Science.gov (United States)

    Yuwono, Bambang Darmo; Awaluddin, Moehammad; Yusuf, M. A.; Fadillah, Rizki

    2017-07-01

    Deformation monitoring is one indicator to assess the feasibility of Dam. In order to get the correct result of the deformation, it is necessary to determine appropriate deformation monitoring network and the observation data should be analyse and evaluated carefully. Measurement and analysis of deformation requires relatively accurate data and the precision is high enough, one of the observation method that used is GPS (Global Positioning System). The research was conducted at Pendidikan Undip Dams is Dam which is located in Tembang. Diponegoro Dam was built in 2013 and a volume of 50.86 m3 of water, inundation normal width of up to 13,500 m2. The main purpose of these building is not only for drainage but also for education and micro hydro power plant etc. The main goal of this reasearch was to monitor and analyze the deformation at Pendidikan Undip Dam and to determaine whether GPS measurement could meet accuracy requirement for dam deformation measurements. Measurements were made 2 times over 2 years, 2015 and 2016 using dual frequency GPS receivers with static methods and processed by Scientific Software GAMIT 10.6

  5. Global phosphorus retention by river damming.

    Science.gov (United States)

    Maavara, Taylor; Parsons, Christopher T; Ridenour, Christine; Stojanovic, Severin; Dürr, Hans H; Powley, Helen R; Van Cappellen, Philippe

    2015-12-22

    More than 70,000 large dams have been built worldwide. With growing water stress and demand for energy, this number will continue to increase in the foreseeable future. Damming greatly modifies the ecological functioning of river systems. In particular, dam reservoirs sequester nutrient elements and, hence, reduce downstream transfer of nutrients to floodplains, lakes, wetlands, and coastal marine environments. Here, we quantify the global impact of dams on the riverine fluxes and speciation of the limiting nutrient phosphorus (P), using a mechanistic modeling approach that accounts for the in-reservoir biogeochemical transformations of P. According to the model calculations, the mass of total P (TP) trapped in reservoirs nearly doubled between 1970 and 2000, reaching 42 Gmol y(-1), or 12% of the global river TP load in 2000. Because of the current surge in dam building, we project that by 2030, about 17% of the global river TP load will be sequestered in reservoir sediments. The largest projected increases in TP and reactive P (RP) retention by damming will take place in Asia and South America, especially in the Yangtze, Mekong, and Amazon drainage basins. Despite the large P retention capacity of reservoirs, the export of RP from watersheds will continue to grow unless additional measures are taken to curb anthropogenic P emissions.

  6. Evaluation of Environmentally Acceptable Lubricants (EALS) for Dams Managed by the U.S. Army Corps of Engineers

    Science.gov (United States)

    2015-08-01

    hydroelectric dams are a significant environmental risk, and they developed a model to assess risk for dams in Canada. Similarly, Verlind et al. (2004...biodegradable and contains no ozone -depleting chemicals, no SARA (Superfund Amendment and Reauthorization Act) Title 313 chemicals, no heavy metals...lubricant discharges and leakages. In 33rd Arctic and Marine Oilspill Program Technical Seminar 529-554. Hanna, L. J., and C. A. Pugh. 1998

  7. The remains of the dam: what have we learned from 15 years of US dam removals?

    Science.gov (United States)

    Gordon E. Grant; Sarah L. Lewis

    2015-01-01

    Important goals for studying dam removal are to learn how rivers respond to large and rapid introductions of sediment, and to develop predictive models to guide future dam removals. Achieving these goals requires organizing case histories systematically so that underlying physical mechanisms determining rates and styles of sediment erosion, transport, and deposition...

  8. Simulating dam - breach flood scenarios of the Tangjiashan landslide dam induced by the Wenchuan earthquake

    NARCIS (Netherlands)

    Fan, Xuanmei; Tang, C.; van Westen, C.J.; Alkema, D.

    2012-01-01

    Floods from failures of landslide dams can pose a hazard to people and property downstream, which have to be rapidly assessed and mitigated in order to reduce the potential risk. The Tangjiashan landslide dam induced by the Mw=7.9 2008 Wenchuan earthquake had impounded the largest lake in the

  9. 78 FR 53494 - Dam Safety Modifications at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams

    Science.gov (United States)

    2013-08-29

    ... Cherokee, TVA would also install about 40 post-tensioned anchors into the concrete portion of the dam... of Dam Structures: Combination of Concrete Floodwalls and Earthen Embankments, will protect the four... Watts Bar). TVA also installed a permanent concrete apron on approximately 2 acres of the downstream...

  10. Consuming a low-fat diet from weaning to adulthood reverses the programming of food preferences in male, but not in female, offspring of 'junk food'-fed rat dams.

    Science.gov (United States)

    Ong, Z Y; Muhlhausler, B S

    2014-01-01

    This study aimed to determine whether the negative effects of maternal 'junk food' feeding on food preferences and gene expression in the mesolimbic reward system could be reversed by weaning the offspring onto a low-fat diet. Offspring of control (n = 11) and junk food-fed (JF, n = 12) dams were weaned onto a standard rodent chow until 6 weeks (juvenile) or 3 months (adult). They were then given free access to both chow and junk food for 3 weeks and food preferences determined. mRNA expression of key components of the mesolimbic reward system was determined by qRT-PCR at 6 weeks, 3 and 6 months of age. In the juvenile group, both male and female JF offspring consumed more energy and carbohydrate during the junk food exposure at 6 weeks of age and had a higher body fat mass at 3 months (P junk food; however, female JF offspring had a higher body fat mass at 6 months (P junk food exposure on food preferences and fat mass can be reversed by consuming a low-fat diet from weaning to adulthood in males. Females, however, retain a higher propensity for diet-induced obesity even after consuming a low-fat diet for an extended period after weaning. © 2013 Scandinavian Physiological Society. Published by John Wiley & Sons Ltd.

  11. The Total Risk Analysis of Large Dams under Flood Hazards

    Directory of Open Access Journals (Sweden)

    Yu Chen

    2018-02-01

    Full Text Available Dams and reservoirs are useful systems in water conservancy projects; however, they also pose a high-risk potential for large downstream areas. Flood, as the driving force of dam overtopping, is the main cause of dam failure. Dam floods and their risks are of interest to researchers and managers. In hydraulic engineering, there is a growing tendency to evaluate dam flood risk based on statistical and probabilistic methods that are unsuitable for the situations with rare historical data or low flood probability, so a more reasonable dam flood risk analysis method with fewer application restrictions is needed. Therefore, different from previous studies, this study develops a flood risk analysis method for large dams based on the concept of total risk factor (TRF used initially in dam seismic risk analysis. The proposed method is not affected by the adequacy of historical data or the low probability of flood and is capable of analyzing the dam structure influence, the flood vulnerability of the dam site, and downstream risk as well as estimating the TRF of each dam and assigning corresponding risk classes to each dam. Application to large dams in the Dadu River Basin, Southwestern China, demonstrates that the proposed method provides quick risk estimation and comparison, which can help local management officials perform more detailed dam safety evaluations for useful risk management information.

  12. Effect of DGAT1 gene mutation in sows of dam-line on the ...

    African Journals Online (AJOL)

    magdalena.szyndler

    2015-08-05

    Aug 5, 2015 ... of breeds used in breeding program as a dam-line: polish large white (PLW) and polish landrace (PL). Colostrum and milk of sows were collected at 1, 7, 14 and 21 days of lactation to assay solids, total protein, fat and lactose. Data on piglet rearing performance were collected at 1, 7, 14 and 21 days of.

  13. Ice interactions at a dam face

    Energy Technology Data Exchange (ETDEWEB)

    Morse, B.; Morse, J.; Beaulieu, P.; Pratt, Y. [Laval Univ., Quebec City, PQ (Canada). Dept. of Civil Engineering; Stander, E. [State Univ. of New York, Cobleskill College, Cobleskill, NY (United States). Dept. of Natural Sciences; Cote, A.; Tarras, A.; Noel, P. [Hydro-Quebec, Varennes, PQ (Canada). IREQ

    2009-07-01

    This paper reported on a joint research project between Laval University and Hydro-Quebec to study ice forces on dams in an effort to harmonize design criteria and develop mitigation strategies. This paper introduced the project and explored some of the preliminary results of the 2007-2008 field season. Ice displacement, ice stresses and ice forces on the LaGabelle dam were measured at several locations. The paper identified and discussed the complex relationships between data sets and discussed the spatial-temporal variability of the ice forces and its impact on design criteria. The project objective was to develop design criteria for ice forces on dams and to provide a scientific basis for interpreting and harmonizing existing recommended criteria. The methodology and site description were presented. It was concluded that the ice processes in a reservoir near a dam face subject to water fluctuations are quite complex. Therefore, in order to know the real average pressure on the dam, a significant amount of panels are required, having important implications for determining safe design values. 9 refs., 10 figs.

  14. Monitoring of the Earth's surface deformation in the area of water dam Zarnowiec

    Science.gov (United States)

    Mojzes, Marcel; Wozniak, Marek; Habel, Branislav; Macak, Marek

    2017-04-01

    Mathematical and physical research directly motivates geodetic community which can provide very accurate measurements for testing of the proposed models Earth's surface motion near the water dams should be monitored due to the security of the area. This is a process which includes testing of existing models and their physical parameters. Change of the models can improve the practical results for analyzing the trends of motion in the area of upper reservoir of water dam Zarnowiec. Since 1998 Warsaw University of Technology realized a research focused on the horizontal displacements of the upper reservoir of water dam Zarnowiec. The 15 selected control points located on the upper reservoir crown of the water dam were monitored by classical distance measurements. It was found out that changes in the object's geometry occur due to the variation of the water level. The control measurements of the changes in the object's geometry occurring during the process of emptying and filling of the upper reservoir of water dam were compared with the deformations computed using improved Boussinesqués method programmed in the software MATLAB and ANSYS for elastic and isotropic half space as derivation of suitable potentials extended to the loaded region. The details and numerical results of this process are presented This presentation was prepared within the project "National Centre for Diagnostic of the Earth's Surface Deformations in the Area of Slovakia", ITMS code: 26220220108.

  15. SWE-SPHysics Simulation of Dam Break Flows at South-Gate Gorges Reservoir

    Directory of Open Access Journals (Sweden)

    Shenglong Gu

    2017-05-01

    Full Text Available This paper applied a Smoothed Particle Hydrodynamics (SPH approach to solve Shallow Water Equations (SWEs to study practical dam-break flows. The computational program is based on the open source code SWE-SPHysics, where a Monotone Upstream-centered Scheme for Conservation Laws (MUSCL reconstruction method is used to improve the Riemann solution with Lax-Friedrichs flux. A virtual boundary particle method is applied to treat the solid boundary. The model is first tested on two benchmark collapses of water columns with the existence of downstream obstacle. Subsequently the model is applied to forecast a prototype dam-break flood, which might occur in South-Gate Gorges Reservoir area of Qinghai Province, China. It shows that the SWE-SPH modeling approach could provide a promising simulation tool for practical dam-break flows in engineering scale.

  16. American Recovery and Reinvestment Act: North Fork Skokomish Powerhouse at Cushman No. 2 Dam

    Energy Technology Data Exchange (ETDEWEB)

    Fischer, Steve [DBA Tacoma Power, WA (United States); McCarty, Patrick [DBA Tacoma Power, WA (United States)

    2013-09-30

    The objective of this project was to add generating capacity on an in-stream flow release at Tacoma Power's Cushman hydroelectric project, Cushman No. 2 Dam, FERC Project P-460. The flow that is being used to generate additional electricity was being discharged from a valve at the base of the dam without recovery of the energy. A second objective to the project was to incorporate upstream fish passage by use of a fish collection structure attached to the draft tubes of the hydroelectric units. This will enable reintroduction of native anadromous fish above the dams which have blocked fish passage since the late 1920's. The project was funded in part by the American Recovery and Reinvestment Act through the Department of Energy, Office of Energy, Efficiency and Renewable Energy, Wind and Water Power Program.

  17. Design of tailing dam using red mud

    Science.gov (United States)

    Rout, Subrat; Sahoo, Tapaswini; Das, Sarat

    2013-06-01

    Red mud, waste industrial product from aluminum industries produced approximately 75 million tonnes every year with less than half of this is used. Storage of this unutilized red mud takes vast tracts of usable land and pollutes, land, air and water. Construction of high embankments, under passes, flyovers, tailing dams uses vast tract of natural resources (top soil) is also matter of concern as its takes thousands of years to form the natural soil. This paper discusses use of red mud for construction of tailing dam based on laboratory findings and finite element analysis. The geotechnical properties such as plasticity, compaction, permeability, shear strength characteristics and dispersion of red mud are presented. Stability and seepage analysis of tailing dams as per finite element analysis using the above geotechnical parameters is presented.

  18. A Mathematical Model for Forecasting the Dam-Break Flood Routing Process of a Landslide Dam

    Directory of Open Access Journals (Sweden)

    Fugang Xu

    2012-01-01

    Full Text Available Once a landslide dam bursts, its reservoir discharges quickly in a flood which will cause catastrophic damage to life and property downstream. For a specific landslide dam, the peak flow rate and the evolution of downstream flood are influenced by the shape and size of the dike breach when dam-break occurs. According to the general nature of landslide dams and field observations of dike-breach development patterns, a dike-breach propagation mode has been determined. By combining an improved empirical equation with knowledge of the dike-breach propagation mode, a mathematical model for forecasting dam-break flood routing has been developed and is presented here. Sensitivity analysis was then carried out based on the computed results for peak flow rate and the flood evolution curve under different parameters. The computed results showed that the width coefficient and the depth coefficient had similar effects on the dam-break flood but that the impact of the depth coefficient was more significant than that of the width coefficient. Finally, the proposed model was used to calculate the flood evolution for the Tangjiashan landslide dam. The computed results showed that the error between the simulated result and the measured data was less than 5%.

  19. Seismic response of concrete gravity dam reinforced with FRP sheets on dam surface

    Directory of Open Access Journals (Sweden)

    Hong Zhong

    2013-10-01

    Full Text Available This paper aims at exploring the effects of anti-seismic reinforcement with the fiber-reinforced polymer (FRP material bonded to the dam surface in dam engineering. Time-history analysis was performed to simulate the seismic failure process of a gravity dam that was assumed to be reinforced at the locations of slope discontinuity at the downstream surface, part of the upstream face, and the dam heel. A damage model considering the influence of concrete heterogeneity was used to model the nonlinearity of concrete. A bond-slip model was applied to the interface between FRP and concrete, and the reinforcement mechanism was analyzed through the bond stress and the stress in FRP. The results of the crack pattern, displacement, and acceleration of the reinforced dam were compared with those of the original one. It is shown that FRP, as a reinforcement material, postpones the occurrence of cracks and slows the crack propagation, and that cracks emanating from the upstream surface and downstream surface are not connected, meaning that the reinforced dam can retain water-impounding function when subjected to the earthquake. Anti-seismic reinforcement with FRP is therefore beneficial to improving the seismic resistant capability of concrete dams.

  20. Study on dynamic anti-sliding stability of a high gravity dam considering complex dam foundation

    Directory of Open Access Journals (Sweden)

    Deng-hong CHEN

    2011-06-01

    Full Text Available There existed some limitations when analyzing the anti-sliding seismic stability of dam-foundation system by traditional pseudo-static method and response spectrum method. The dynamic strength reduction method was used to study on the deep anti-sliding stability of a high gravity dam considering complex dam foundation under strong earthquake-induced ground action. The static analysis was firstly carried out by reducing the shear strength parameters of the dam foundation’s rock mass with equal proportion. Then, the time-history seismic analysis was carried out based on the static analysis. It was proposed as one of dynamic instability criterions that the peak values of the dynamic displacements and plastic strain energy change suddenly with increasing strength reduction coefficient. The elasto-plastic behavior of the dam foundation was idealized using Drucker–Prager yield criterion based on associated flow rule assumption. Through the static, dynamic strength reduction analysis and dynamic linear elastic analysis of the overflow dam monolith of a high gravity dam, the results’ reliability of elastic-plastic time history analysis was confirmed. The results also showed that the rock mass strength of the high gravity dam foundation has higher strength reserve coefficient. The instability criterions of dynamic strength reduction method proposed were feasible. Although the static anti-slide analysis methods and standards of gravity dam based on the numerical methods are being discussed at present, the dynamic calculation method and instability criterions proposed in this paper would provide some meaningful suggestions for the dynamic analysis of the similar projects.

  1. Lac Courte Oreilles Hydro Dam Assessment

    Energy Technology Data Exchange (ETDEWEB)

    Weaver, Jason [Lac Courte Oreilles, Hayward, WI (United States); Meyers, Amy [Kiser Hydro, LLC, Norway, MI (United States)

    2014-12-31

    The main objective of this project was to investigate upgrading the existing hydro power generating system at the Winter Dam. The tribe would like to produce more energy and receive a fair market power purchase agreement so the dam is no longer a drain on our budget but a contributor to our economy. We contracted Kiser Hydro, LLC Engineering for this project and received an engineering report that includes options for producing more energy with cost effective upgrades to the existing turbines. Included in this project was a negotiation of energy price sales negotiations.

  2. Computational Aspects of Dam Risk Analysis: Findings and Challenges

    Directory of Open Access Journals (Sweden)

    Ignacio Escuder-Bueno

    2016-09-01

    Full Text Available In recent years, risk analysis techniques have proved to be a useful tool to inform dam safety management. This paper summarizes the outcomes of three themes related to dam risk analysis discussed in the Benchmark Workshops organized by the International Commission on Large Dams Technical Committee on “Computational Aspects of Analysis and Design of Dams.” In the 2011 Benchmark Workshop, estimation of the probability of failure of a gravity dam for the sliding failure mode was discussed. Next, in 2013, the discussion focused on the computational challenges of the estimation of consequences in dam risk analysis. Finally, in 2015, the probability of sliding and overtopping in an embankment was analyzed. These Benchmark Workshops have allowed a complete review of numerical aspects for dam risk analysis, showing that risk analysis methods are a very useful tool to analyze the risk of dam systems, including downstream consequence assessments and the uncertainty of structural models.

  3. National Inventory of Dams Coastal California Extract 2010

    Data.gov (United States)

    California Department of Resources — The National Inventory of Dams (NID) is a congressionally authorized database, which documents dams in the U.S. and its territories. The NID was most recently...

  4. Dam-Break Flood Analysis Upper Hurricane Reservoir, Hartford, Vermont

    National Research Council Canada - National Science Library

    Acone, Scott

    1995-01-01

    .... Various dam break flood conditions were modeled and inundation maps developed. Based on this analysis the dam is rated a Class 2 or significant hazard category in terms of its potential to cause downstream damage...

  5. Inventory of Dams in the State of Iowa

    Data.gov (United States)

    Iowa State University GIS Support and Research Facility — Permitted dams in Iowa and associated attributes, as recorded by the Floodplain Section of the DNR. The dams regulated are those with the parameters listed below: a....

  6. Investigation on the Causes of Cracking in Earth Dams (Case study: Mahmood-Abad Earth Dam

    Directory of Open Access Journals (Sweden)

    H. Rahimi

    2016-09-01

    Full Text Available Introduction: Cracking of earth dams is a one of the main threat causes of stability of embankment dams. In this research by modeling of the behavior of an embankment dam and employing conditions of the earthquake, the reasons of cracking were inspected using by modeling of earth dam behavior. Based on the literature, one of the main causes of dam failures is sliding and cracking of the dam structure during earthquake. Localized liquefaction of foundation soils was one of the causes of the observed post-earthquake distress within these dams. Material and Methods: In order to study the causes and the results of crack on earth dams, Mahmoodabad earthen dam with a height of 19 m, is located in Zanjan province, northwest of Iran, which suffered a longitudinal crack on the crest and slight sliding of the upstream slope due to 2001 Avaj earthquake was studied. This dam has faced earthquake two times with an interval of two years. During the first earthquake with the magnitude about 6.6 in Richter scale small longitudinal cracks had created on the crest. The developed cracks had been repaired by injecting the cement and then has been hidden by passing the time. After the second earthquake with the magnitude about 6.5 in Richter scale the hidden cracks had been appeared again and the slight movement of the upper slopes of dam reported. Based on the site investigation and documented information about dam, including maps and parameter data, the behavior of the dam has modeled by using Plaxis as a finite element model. In order to check the accuracy of the design of dam, the stability analysis has been conducted using by Xslope as a limit equilibrium model. The foundation conditions and the Geotechnical properties of the layer beneath the dam has been inspected by open excavation. Results and Discussion: Underground investigation about Geotechnical properties of dam foundation has showed that there is a thin sandy layer confined in alluvium material of the

  7. Dams and transnational advocacy: Political opportunities in transnational collective action

    Science.gov (United States)

    Fu, Teng

    Possible arguments to explain the gradual decline in big dam development and its site transferring from developed to developing countries include technical, economic, and political factors. This study focuses on the political argument---the rise of transnational anti-dam advocacy and its impact on state policy-making. Under what conditions does transnational anti-dam advocacy matter? Under what conditions does transnational advocacy change state dam policies (delay, scale down, or cancel)? It examines the role of transnational anti-dam actors in big dam building in a comparative context in Asia. Applying the social movement theory of political opportunity structure (POS) and using the qualitative case-study method, the study provides both within-case and cross-case analyses. Within-case analysis is utilized to explain the changing dynamics of big dam building in China (Three Gorges Dam and proposed Nu/Salween River dam projects), and to a lesser extent, Sardar Sarovar Project in India and Nam Theun 2 Dam in Laos. Different domestic and international POS (DPOS and IPOS) impact the strategies and outcomes of anti-dam advocacies in these countries. The degree of openness of the POS directly affects the capacity of transnational efforts in influencing state dam policies. The degree of openness or closure is measured by specific laws, institutions, discourse, or elite allies (or the absence of these) for the participation of non-state actors on big dam issues at a particular moment. This degree of openness is relative, varying over time, across countries and regions. This study finds that the impact of transnational anti-dam activism is most effective when both DPOS and IPOS are relatively open. Transnational anti-dam advocacy is least effective in influencing state dam policies when both DPOS and IPOS are relatively closed. Under a relatively open DPOS and closed IPOS, transnational anti-dam advocacy is more likely to successfully change state dam policies and even

  8. Diagnosis of embankment dam distresses using Bayesian networks. Part I. Global-level characteristics based on a dam distress database

    National Research Council Canada - National Science Library

    Zhang, L. M; Xu, Y; Jia, J. S; Zhao, C

    2011-01-01

    .... The main objective of this paper is to develop a robust probability-based tool using Bayesian networks for the diagnosis of embankment dam distresses at the global level based on past dam distress data...

  9. Major dams of the United States, Geographic NAD83, USGS (2006) [dams00x020_USGS_2006

    Data.gov (United States)

    Louisiana Geographic Information Center — This map layer portrays major dams of the United States, including Puerto Rico and the U.S. Virgin Islands. The map layer was created by extracting dams 50 feet or...

  10. How to manage the cumulative flood safety of catchment dams ...

    African Journals Online (AJOL)

    Dam safety is a significant issue being taken seriously worldwide. However, in Australia, although much attention is being devoted to the medium- to large-scale dams, minimal attention is being paid to the serious potential problems associated with smaller dams, particularly the potential cumulative safety threats they pose ...

  11. INTRODUCTION All earth dams in their natural state experience ...

    African Journals Online (AJOL)

    INTRODUCTION. All earth dams in their natural state experience some degree of seepage and spillage flow from the reservoir and through permeable soils. Seepage and spillage may also be associated with internal erosion in the dam, and internal erosion is one of the main reasons for dam failures (Sjodahl, 2006).

  12. SEISMIC RESPONSE OF DAM WITH SOIL-STRUCTURE INTERACTION.

    Science.gov (United States)

    Bycroft, G.N.; Mork, P.N.

    1987-01-01

    An analytical solution to the response of a long trapezoidal-section dam on a foundation consisting of an elastic half-space and subjected to simulated earthquake motion is developed. An optimum seismic design is achieved when the cross section of the dam is triangular. The effect of soil structure interaction is to lower the strain occurring in the dam.

  13. Earthquake induced liquefaction analysis of Tendaho earth-fill dam ...

    African Journals Online (AJOL)

    fill dam, which is part of Tendaho Dam and Irrigation Project; the largest irrigation project in Ethiopia to date. The dam is located in the most seismic part of Ethiopia and was originally designed to be founded on potentially liquefiable alluvium ...

  14. Field Experimental Analysis of Prototype Twin Dam Failure Phenomenon

    Science.gov (United States)

    Tseng, Fu-Min; Chen, Su-Chin; An, Hsiuan-Pei

    2015-04-01

    We constructed a full scale two-dam system in Landao Creek, Huisun forest, Taiwan. From its own alluvium to investigate the dam break morphology and physical properties between two dams with three intervals in 16.2m (case 1), 32.4m (case 2) and 64.8m (case 3). We adjusted the interval by fixed upstream dam and changed downstream dam site to observed and analyzed dam failure processes and hydraulic properties of the dam system. Grain size distribution investigation and 3D Lidar model of the stream bed were executed before and after dams break to discuss the river morphology evolution. In addition, to explore the type of breach varying with time, we used the method of 3D Remodeling from Motion Structure with Multi-View Stereo, which is a 3D spatial modeling process by photoing an object at same time in more than four different angles with over 70% overlap to each other, to construct the 3D model of dams system in this study. Furthermore, the dam break process were analyzed by cameras images and data recorded from water level gauges. The result showed that the shortest intervals in Case 1 result in a stronger torrent impact at upstream side of downstream dam, more significant reduction in dam intensity and wider breach which was 22% more than that in Case 2. On the contrary, the failure duration between two dams in Case 3 was 4.0 and 2.7 times longer than that in Case 1 and Case 2, respectively. Consequently, the decrement of dam interval led to a greater damage and rapid increment of water level which was prompted by outburst flow from the upstream dam failure at downstream dam, and shorter failure duration in two-dam system. In addition, the transport distance of sediment which yielded from upstream dam breach depend on whether downstream was obstructed or not. The 90% sediment of upstream dam breach were deposited on the upstream side of downstream dam with a comparison of entire loss in case of downstream dam.

  15. Investigation of geophysical methods for assessing seepage and internal erosion in embankment dams : a study of through-dam seismic testing at WAC Bennett Dam

    Energy Technology Data Exchange (ETDEWEB)

    Gaffran, P.; Jeffries, M. [BC Hydro, Burnaby, BC (Canada)

    2005-07-15

    Crosshole tomography is used to establish the distribution of seismic velocity between drill holes. The through-dam mode takes advantage of the triangular cross-section of earth embankments, obviating the need for drill holes. Seismic energy, generated on one face of the dam, passes underneath the crest and is detected by sensors arrayed on the opposite face. The sinkholes discovered at WAC Bennett Dam in 1996 provided an opportunity to test the procedure. Using p-wave energy, two series of measurements were conducted, notably one immediately before remediation of one sinkhole, and a second one shortly after the sinkhole was repaired. The known defect was successfully imaged by the first round of measurements. This report presented the results of an investigation of the through-dam seismic method using propagation of seismic waves through a dam from upstream to downstream, or vice-versa. The purpose of the study was to determine if this procedure could characterize the distribution of seismic velocity within a dam in an accurate and cost effective manner. The report presented the methods of velocity testing such as crosshole and downhole, and tomography; and through-dam measurements. Background to the Bennett Dam studies was also provided, with particular reference to the Bennett Dam sinkholes; sinkhole investigations; working hypothesis for sinkhole development; sinkhole number one characterization; and sinkhole remediation. An analysis of compression wave testing at Bennett Dam and shear wave testing was then offered. Other topics that were discussed included field test procedures; methodologies for data processing; p-waves versus s-waves; applicability of the research; and costs of through-dam surveys. It was concluded that under the right circumstances, through-dam seismic testing was capable of detecting changed conditions in an embankment dam. 15 refs., 2 tabs., 41 figs., 1 appendix.

  16. DAM-LAKEFRONT PLAZA: Revitalization of an Agriculture Reservoir Dam in Kashar-Tirana/Albania

    Directory of Open Access Journals (Sweden)

    Valbona Koçi

    2014-12-01

    Full Text Available The Dam-Lakefront Plaza in Kashar-Tirana/Albania is a research project that proposes not only the re-consideration and reinforcement of the artificial Reservoirs Dams built during Socialism in Albania, but envisions the maintenance of dams and revitalization of the lakeside area promoting the public-private collaboration. In addition, it envisions the generation of qualitative and lively public spaces in sub-urban areas as well. Admitting the artificial lakes as specific nodes of man-made infrastructure in the landscape, and consequently the dams (together with the drainage channels as important hydrotechnic elements of the flood protection infrastructure, this research intends to elaborate on one type of landscape infrastructure - the vertical screens, offering a mediation between the natural and built landscape.

  17. Dams life. Dams in operation; La vie des barrages. Barrages en exploitation

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-31

    This paper summarizes the conclusions of the annual inspections of French dams in operation (fissures, water oozing, concrete swelling etc..). Only the observations which require a special attention are reported. (J.S.)

  18. Facilitating fish passage at ultra low head dams: An alternative to dam removal

    Science.gov (United States)

    Odeh, M.

    2004-01-01

    Ecosystem sustainability and returning the biological integrity to rivers continue to change the landscape of fish passage technology. Installing a conventional fishways has a limited degree of success in accommodating fish passage needs. Recently, the option of total dam removal has been gaining momentum among resource managers, conservationists, and even engineers. Certain dams, however, cannot be removed, and conventional fishways are either too expensive to build or the real estate is simply not available; yet freedom of passage must be attained. At the Little Falls Dam on the Potomac River a notch in the crest of the dam was installed to accommodate passage of fish. The notch has three labyrinth weirs used for energy dissipation. Water velocities are maintained at less than about 4 m/s anywhere within the passage structure during migratory season of the target species (American shad). Construction of this novel design was recently completed (March 2000) and future biological evaluations are ongoing. Copyright ASCE 2004.

  19. Application of strength reduction method to dynamic anti-sliding stability analysis of high gravity dam with complex dam foundation

    OpenAIRE

    Deng-hong Chen; Cheng-bin Du

    2011-01-01

    Considering that there are some limitations in analyzing the anti-sliding seismic stability of dam-foundation systems with the traditional pseudo-static method and response spectrum method, the dynamic strength reduction method was used to study the deep anti-sliding stability of a high gravity dam with a complex dam foundation in response to strong earthquake-induced ground action. Based on static anti-sliding stability analysis of the dam foundation undertaken by decreasing the shear streng...

  20. Modelling approach for gravity dam break analysis

    Directory of Open Access Journals (Sweden)

    Boussekine Mourad

    2016-09-01

    Full Text Available The construction of dams in rivers can provide considerable benefits such as the supply of drinking and irrigation water; however the consequences which would result in the event of their failure could be catastrophic. They vary dramatically depending on the extent of the inundation area, the size of the population at risk.

  1. 75 FR 49429 - Metal and Nonmetal Dams

    Science.gov (United States)

    2010-08-13

    ... monitored at frequent intervals by a person trained to recognize unusual conditions; be inspected by a... identify unusual conditions and signs of instability. Personnel with more specialized knowledge of dam... be qualified for their level of responsibility and trained in inspection procedures. 11. What...

  2. Resilience scales of a dammed tropical river

    Science.gov (United States)

    Calamita, Elisa; Schmid, Martin; Wehrli, Bernhard

    2017-04-01

    Artificial river impoundments disrupt the seasonality and dynamics of thermal, chemical, morphological and ecological regimes in river systems. These alterations affect the aquatic ecosystems in space and time and specifically modify the seasonality and the longitudinal gradients of important biogeochemical processes. Resilience of river systems to anthropogenic stressors enables their recovery along the flow path; however little is known about the longitudinal distance that rivers need to partially restore their physical, chemical and biological integrity. In this study, the concept of a "resilience scale" will be explored for different water quality parameters downstream of Kariba dam, the largest artificial lake in the Zambezi basin (South-East Africa). The goal of this project is to develop a modelling framework to investigate and quantify the impact of large dams on downstream water quality in tropical context. In particular, we aim to assess the degree of reversibility of the main downstream alterations (temperature, oxygen, nutrients) and consequently the quantification of their longitudinal extent. Coupling in-situ measurements with hydraulic and hydrological parameters such as travel times, will allow us to define a physically-based parametrization of the different resilience scales for tropical rivers. The results will be used for improving future dam management at the local scale and assessing the ecological impact of planned dams at the catchment scale.

  3. living in Kapulukaya Dam Lake (Kirikkale, Turkey)

    African Journals Online (AJOL)

    GREGORY

    2010-08-23

    Aug 23, 2010 ... This study involves the investigation of the breeding properties of Esox lucius (L., 1758) living in. Kapulukaya Dam Lake in Turkey. It was observed that the fish reaches sexual maturity at the age of 3, and the breeding period starts in February and ends in March. The highest and lowest gonadosomatic.

  4. Dam that social networking: connecting South Africa's major dams to social media

    CSIR Research Space (South Africa)

    Butgereit, L

    2011-10-01

    Full Text Available appealing to the general public, the Internet was trawled for additional information. This additional information was appended to the water level status updates. Sites such as YouTube, Google Scholar, Google Books, and Google News were automatically... searched on a regular basis for various keywords such as ?Vaal Dam Sluice Gates? and ?Bloemhof Dam fishing?. The information which was retrieved on those automatic searches was randomly appended to the water level information. 8. Evaluation...

  5. Experimental Research on the Dam-Break Mechanisms of the Jiadanwan Landslide Dam Triggered by the Wenchuan Earthquake in China

    Science.gov (United States)

    Xu, Fu-gang; Yang, Xing-guo; Hao, Ming-hui

    2013-01-01

    Dam breaks of landslide dams are always accompanied by large numbers of casualties, a large loss of property, and negative influences on the downstream ecology and environment. This study uses the Jiadanwan landslide dam, created by the Wenchuan earthquake, as a case study example. Several laboratory experiments are carried out to analyse the dam-break mechanism of the landslide dam. The different factors that impact the dam-break process include upstream flow, the boulder effect, dam size, and channel discharge. The development of the discharge channel and the failure of the landslide dam are monitored by digital video and still cameras. Experimental results show that the upstream inflow and the dam size are the main factors that impact the dam-break process. An excavated discharge channel, especially a trapezoidal discharge channel, has a positive effect on reducing peak flow. The depth of the discharge channel also has a significant impact on the dam-break process. The experimental results are significant for landslide dam management and flood disaster prevention and mitigation. PMID:23844387

  6. Proceeding of the public safety around dams conference

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    The Canadian Dam Association hosted the Public Safety Around Dams workshop in which presentations were given in the morning to describe the different measures and methods implemented by the Ontario Ministry of Natural Resources, Ontario Power Generation and others to improve safety around dams. In the afternoon, the participants toured the Auburn and Lakefield dams and facilities to view the infrastructures and equipment. A roundtable discussion concluded the day. Following this workshop, a Public Safety Around Dams group was created on the social network site, LinkedIn. This conference featured 6 presentations, 3 of which have been catalogued separately for inclusion in this database.

  7. Seismic failure modes and seismic safety of Hardfill dam

    Directory of Open Access Journals (Sweden)

    Kun XIONG

    2013-04-01

    Full Text Available Based on microscopic damage theory and the finite element method, and using the Weibull distribution to characterize the random distribution of the mechanical properties of materials, the seismic response of a typical Hardfill dam was analyzed through numerical simulation during the earthquakes with intensities of 8 degrees and even greater. The seismic failure modes and failure mechanism of the dam were explored as well. Numerical results show that the Hardfill dam remains at a low stress level and undamaged or slightly damaged during an earthquake with an intensity of 8 degrees. During overload earthquakes, tensile cracks occur at the dam surfaces and extend to inside the dam body, and the upstream dam body experiences more serious damage than the downstream dam body. Therefore, under the seismic conditions, the failure pattern of the Hardfill dam is the tensile fracture of the upstream regions and the dam toe. Compared with traditional gravity dams, Hardfill dams have better seismic performance and greater seismic safety.

  8. PREDICTION OF TOTAL DISSOLVED GAS EXCHANGE AT HYDROPOWER DAMS

    Energy Technology Data Exchange (ETDEWEB)

    Hadjerioua, Boualem [ORNL; Pasha, MD Fayzul K [ORNL; Stewart, Kevin M [ORNL; Bender, Merlynn [Bureau of Reclamation; Schneider, Michael L. [U.S. Army Corps of Engineers

    2012-07-01

    Total dissolved gas (TDG) supersaturation in waters released at hydropower dams can cause gas bubble trauma in fisheries resulting in physical injuries and eyeball protrusion that can lead to mortality. Elevated TDG pressures in hydropower releases are generally caused by the entrainment of air in spillway releases and the subsequent exchange of atmospheric gasses into solution during passage through the stilling basin. The network of dams throughout the Columbia River Basin (CRB) are managed for irrigation, hydropower production, flood control, navigation, and fish passage that frequently result in both voluntary and involuntary spillway releases. These dam operations are constrained by state and federal water quality standards for TDG saturation which balance the benefits of spillway operations designed for Endangered Species Act (ESA)-listed fisheries versus the degradation to water quality as defined by TDG saturation. In the 1970s, the United States Environmental Protection Agency (USEPA), under the federal Clean Water Act (Section 303(d)), established a criterion not to exceed the TDG saturation level of 110% in order to protect freshwater and marine aquatic life. The states of Washington and Oregon have adopted special water quality standards for TDG saturation in the tailrace and forebays of hydropower facilities on the Columbia and Snake Rivers where spillway operations support fish passage objectives. The physical processes that affect TDG exchange at hydropower facilities have been studied throughout the CRB in site-specific studies and routine water quality monitoring programs. These data have been used to quantify the relationship between project operations, structural properties, and TDG exchange. These data have also been used to develop predictive models of TDG exchange to support real-time TDG management decisions. These empirically based predictive models have been developed for specific projects and account for both the fate of spillway and

  9. GIS inundation mapping and dam breach analysis of Woolwich Dam using HEC-geoRAS

    Energy Technology Data Exchange (ETDEWEB)

    Mocan, N. [Crozier and Associates Inc., Collingwood, ON (Canada); Joy, D.M. [Guelph Univ., ON (Canada); Rungis, G. [Grand River Conservation Authority, Cambridge, ON (Canada)

    2006-07-01

    A study was conducted to determine the extent of flood inundation given a hypothetical dam breach scenario of the Woolwich Dam located in the Grand River Watershed, 2.5 km north of the Town of Elmira, Ontario. The dam is operated by the Grand River Conservation Authority and was constructed to provide low-flow augmentation to Canagagigue Creek. Advances in the computational capabilities of numerical models along with the availability of fine resolution geospatial data has lead to significant advances in the evaluation of catastrophic consequences due to the ensuing flood waters when dams fail. The hydraulic models HEC-RAS and HEC-GeoRAS were used in this study along with GIS to produce high resolution spatial and temporal flood inundation mapping. Given the proximity to the Town of Elmira, the dam is classified as having a high hazard potential. The large size and high hazard potential of the dam suggests that the Inflow Design Flood (IDF) is the Probable Maximum Flood (PMF) event. The outlet structure of the spillway consists of 4 ogee-type concrete spillways equipped with radial gates. A low-level concrete pipe located within the spillway structure provides spillage for maintenance purposes. The full flow capacity of the spillway structure is 297 cubic metres per second at the full supply level of 364.8 metres. In addition to GIS flood inundation maps, this paper included the results of flood hydrographs, water surface profiles and peak flow data. It was concluded that techniques used in this analysis should be considered for use in the development of emergency management planning and dam safety assessments across Canada. 6 refs., 3 tabs., 4 figs.

  10. Dam-breach analysis and flood-inundation mapping for selected dams in Oklahoma City, Oklahoma, and near Atoka, Oklahoma

    Science.gov (United States)

    Shivers, Molly J.; Smith, S. Jerrod; Grout, Trevor S.; Lewis, Jason M.

    2015-01-01

    Dams provide beneficial functions such as flood control, recreation, and storage of water supplies, but they also entail risk; dam breaches and resultant floods can cause substantial property damage and loss of life. The State of Oklahoma requires each owner of a high-hazard dam, which the Federal Emergency Management Agency defines as dams for which failure or improper operation probably will cause loss of human life, to develop an emergency action plan specific to that dam. Components of an emergency action plan are to simulate a flood resulting from a possible dam breach and map the resulting downstream flood-inundation areas. The resulting flood-inundation maps can provide valuable information to city officials, emergency managers, and local residents for planning an emergency response if a dam breach occurs.

  11. Mathematical Modeling in Systems for Operational Evaluation of the Stress-Strain State of the Arch-Gravity Dam at the Sayano-Shushenskaya Hydroelectric Power Plant

    Energy Technology Data Exchange (ETDEWEB)

    Bellendir, E. N.; Gordon, L. A., E-mail: lev-gordon@mail.ru; Khrapkov, A. A.; Skvortsova, A. E., E-mail: SkvortsovaAE@vniig.ru [B. E. Vedeneev All-Russia Research Institute of Hydraulic Engineering (VNIIG) (Russian Federation)

    2017-01-15

    Current studies of the stress-strain state of the dam at the Sayano-Shushenskaya Hydroelectric Power Plant at VNIIG based on mathematical modeling including full scale and experimental data are described. Applications and programs intended for automatic operational evaluation of the stress-strain state of the dam for optimizing control of the upper race level in the course of the annual filling-drawdown cycle and during seismic events are examined. Improvements in systems for monitoring the stress-strain state of concrete dams are proposed.

  12. Monitoring and maintenance at Kariba dam

    Energy Technology Data Exchange (ETDEWEB)

    Goguel, B. (Coyne et Bellier, Bureau d' Ingenieurs-Conseils, 75 - Paris (France)); Mpala, A.S. (Zambezi River Authority, Lusaka (Zambia))

    1992-06-01

    The 128 m-high Kariba arch dam, built between 1955 and 1959 on the Zambezi river, is on the border between Zambia and Zimbabwe. It creates one of the largest man-made lakes in the world, and supplies two power stations with a total capacity of 1266 MW. Safety monitoring of the dam and its foundation is a long-term, continuous and very important function, which guides maintenance efforts. The general behaviour of the work is influenced by the complex geological conditional changes on the right(south) bank, slow long-term dimensional changes in the concrete, and variable hydrological conditions. After a comprehensive study of the instrumentation data amassed up to 1983, additional instrumentation was provided between 1986 and 1989. The new data analysis has begun recently and is expected to allow for interpretation of the long-term phenomena involved. (author).

  13. Kariba: the dubious benefits of large dams

    Energy Technology Data Exchange (ETDEWEB)

    Balon, E.K.

    1978-01-01

    The ecological consequences of dam building extend far beyond the common cost-benefit analysis. On the Zambezi River for example, a unique and stable ecological system, which took millenia to develop, was rapidly changed by dams into less productive lakes. The process was accompanied by widespread destruction and misery. The production of the electricity required for a more profitable export of mineral resources rendered the local inhabitants dependent on external sources of food, water, etc., where they had formerly been self-sufficient. The surface of the lake reflects more solar energy than the old terrestrial system. As a consequence, fish production is lower than the lost production of plants and game. Species diversity may be increased by natural invasion and artificial introduction, but the production limits of the system can not be changed.

  14. Landfill liners from dam reservoir sediments

    Directory of Open Access Journals (Sweden)

    Koś Karolina

    2016-03-01

    Full Text Available Landfill liners from dam reservoir sediments. Every municipal solid waste landfill has to be properly secured to protect the natural environment from possible leachate. Most often an artificial sealing is used, which is based on a soil liner from cohesive soils (clays, silts. Usability evaluation of bottom sediments from Rzeszowski Reservoir for building these liners was presented in the paper. Sediments from dam reservoirs, gathered as a result of the siltation process, can be a valuable material for earthworks purposes. Determination of their possible ways of usage is important, especially before the planned dredging, because thanks to that this material will not be put on a heap. Based on the analysis of the geotechnical parameters of these sediments it was stated that this material can be preliminary allowed for using in liners.

  15. Dam Seepage Investigation of an Earthfill Dam in Warren County, Missouri Using Geophysical Methods

    Directory of Open Access Journals (Sweden)

    Stanley C. Nwokebuihe

    2017-01-01

    Full Text Available Electrical resistivity tomography (ERT, induced polarization (IP and spontaneous potential (SP data were acquired across and in proximity to a leaking earth-fill dam (Wolf Creek dam in Warren County, Missouri. The objectives were to identify and map probable seepage pathways through the dam and to determine if the outlet works drainage pipe used in the construction of the dam was leaking. On the basis of the integrated interpretation of the acquired geophysical data two probable seepage pathways through the leaking earth-fill dam were identified and mapped. These two pathways are referred to as the Groin Leak and Water Fall Leak, respectively. The Groin Leak and Water Fall Leak seepage pathways are both characterized by relatively low resistivity and low chargeability. It is also concluded that there is high probability that water is leaking from the downstream end of the outlet works drainage pipe. The interpreted drainage pipe leak (Outlet works Leak is characterized by relatively low resistivity, high chargeability and negative self-potential values.

  16. Dam removal increases American eel abundance in distant headwater streams

    Science.gov (United States)

    Hitt, Nathaniel P.; Eyler, Sheila; Wofford, John E.B.

    2012-01-01

    American eel Anguilla rostrata abundances have undergone significant declines over the last 50 years, and migration barriers have been recognized as a contributing cause. We evaluated eel abundances in headwater streams of Shenandoah National Park, Virginia, to compare sites before and after the removal of a large downstream dam in 2004 (Embrey Dam, Rappahannock River). Eel abundances in headwater streams increased significantly after the removal of Embrey Dam. Observed eel abundances after dam removal exceeded predictions derived from autoregressive models parameterized with data prior to dam removal. Mann–Kendall analyses also revealed consistent increases in eel abundances from 2004 to 2010 but inconsistent temporal trends before dam removal. Increasing eel numbers could not be attributed to changes in local physical habitat (i.e., mean stream depth or substrate size) or regional population dynamics (i.e., abundances in Maryland streams or Virginia estuaries). Dam removal was associated with decreasing minimum eel lengths in headwater streams, suggesting that the dam previously impeded migration of many small-bodied individuals (<300 mm TL). We hypothesize that restoring connectivity to headwater streams could increase eel population growth rates by increasing female eel numbers and fecundity. This study demonstrated that dams may influence eel abundances in headwater streams up to 150 river kilometers distant, and that dam removal may provide benefits for eel management and conservation at the landscape scale.

  17. Will Dam Removal Increase Nitrogen Flux to Estuaries?

    Directory of Open Access Journals (Sweden)

    Arthur J. Gold

    2016-11-01

    Full Text Available To advance the science of dam removal, analyses of functions and benefits need to be linked to individual dam attributes and effects on downstream receiving waters. We examined 7550 dams in the New England (USA region for possible tradeoffs associated with dam removal. Dam removal often generates improvements for safety or migratory fish passage but might increase nitrogen (N flux and eutrophication in coastal watersheds. We estimated N loading and removal with algorithms using geospatial data on land use, stream flow and hydrography. We focused on dams with reservoirs that increase retention time at specific points of river reaches, creating localized hotspots of elevated N removal. Approximately 2200 dams with reservoirs had potential benefits for N removal based on N loading, retention time and depth. Across stream orders, safety concerns on these N removal dams ranged between 28% and 44%. First order streams constituted the majority of N removal dams (70%, but only 3% of those were classified as high value for fish passage. In cases where dam removal might eliminate N removal function from a particular reservoir, site-specific analyses are warranted to improve N delivery estimates and examine alternatives that retain the reservoir while enhancing fish passage and safety.

  18. Using a coupled eco-hydrodynamic model to predict habitat for target species following dam removal

    Science.gov (United States)

    Tomsic, C.A.; Granata, T.C.; Murphy, R.P.; Livchak, C.J.

    2007-01-01

    A habitat suitability index (HSI) model was developed for a water quality sensitive fish (Greater Redhorse) and macroinvertebrate (Plecoptera) species to determine the restoration success of the St. John Dam removal for the Sandusky River (Ohio). An ArcGIS?? model was created for pre- and post-dam removal scenarios. Inputs to the HSI model consist of substrate distributions from river surveys, and water level and velocity time series, outputs from a hydrodynamic model. The ArcGIS?? model predicted habitat suitability indices at 45 river cross-sections in the hydrodynamic model. The model was programmed to produce polygon layers, using graphical user interfaces that were displayed in the ArcGIS?? environment. The results of the model clearly show an increase of habitat suitability from pre- to post-dam removal periods and in the former reservoir. The change in suitability of the model is attributed mostly to the change in depth in the river following the dam removal for both the fish and invertebrate species. The results of the invertebrate model followed the same positive trend as species enumerations from the river basin. ?? 2007 Elsevier B.V. All rights reserved.

  19. Numerical Analyses of Earthquake Induced Liquefaction and Deformation Behaviour of an Upstream Tailings Dam

    Directory of Open Access Journals (Sweden)

    Muhammad Auchar Zardari

    2017-01-01

    Full Text Available Much of the seismic activity of northern Sweden consists of micro-earthquakes occurring near postglacial faults. However, larger magnitude earthquakes do occur in Sweden, and earthquake statistics indicate that a magnitude 5 event is likely to occur once every century. This paper presents dynamic analyses of the effects of larger earthquakes on an upstream tailings dam at the Aitik copper mine in northern Sweden. The analyses were performed to evaluate the potential for liquefaction and to assess stability of the dam under two specific earthquakes: a commonly occurring magnitude 3.6 event and a more extreme earthquake of magnitude 5.8. The dynamic analyses were carried out with the finite element program PLAXIS using a recently implemented constitutive model called UBCSAND. The results indicate that the magnitude 5.8 earthquake would likely induce liquefaction in a limited zone located below the ground surface near the embankment dikes. It is interpreted that stability of the dam may not be affected due to the limited extent of the liquefied zone. Both types of earthquakes are predicted to induce tolerable magnitudes of displacements. The results of the postseismic slope stability analysis, performed for a state after a seismic event, suggest that the dam is stable during both the earthquakes.

  20. National Dam Safety Program. Court Street Dam (Inventory Number NY 6843), Monroe County, New York

    Science.gov (United States)

    1980-09-30

    i. Foundation . - V- .d* 6 I I ~j. Abutments ,, ,.-. ,X. 1. Approach & Outlet Channels .... _ __’_ _ _ _ M. Energy Dissipators (Plunge...4o16.03)( 6Oba.24)( 7500.34)( 942b.26)( HiDRO $RAPH At 1, 200.00 1 lY925o 34668. 49812. 64756. 79699. 99b24.( o73.40) ( 5b64.21)( 987.3b)( 1410.52

  1. Do Hydroelectric Dams Mitigate Global Warming? The Case of Brazil's Curuna Dam

    Energy Technology Data Exchange (ETDEWEB)

    Fearnside, P.M. [National Institute for Research in the Amazon (INPA), C.P. 478, 69011-970 Manaus, Amazonas (Brazil)

    2005-10-15

    Hydroelectric dams in tropical forest areas emit greenhouse gases, as illustrated by the Curuna dam in the Amazonian portion of Brazil. Emissions include carbon dioxide from decay of the above-water portions of trees that are left standing in the reservoir and methane from soft vegetation that decays under anaerobic conditions on the bottom of the reservoir, especially macrophytes (water weeds) and vegetation that grows in the drawdown zone and is flooded when the reservoir water level rises. Some methane is released from the reservoir surface through bubbling and diffusion, but larger amounts are released from water passing through the turbines and spillway. Methane concentration in the water increases with depth, and the turbines and spillway draw water from sufficient depth to have substantial methane content. In 1990 (13 years after filling), the Curuna Dam emitted 3.6 times more greenhouse gases than would have been emitted by generating the same amount of electricity from oil.

  2. Simulating dam-breach flood scenarios of the Tangjiashan landslide dam induced by the Wenchuan Earthquake

    Directory of Open Access Journals (Sweden)

    X. Fan

    2012-10-01

    Full Text Available Floods from failures of landslide dams can pose a hazard to people and property downstream, which have to be rapidly assessed and mitigated in order to reduce the potential risk. The Tangjiashan landslide dam induced by the Mw = 7.9 2008 Wenchuan earthquake had impounded the largest lake in the earthquake affected area with an estimated volume of 3 × 108 m3, and the potential catastrophic dam breach posed a serious threat to more than 2.5 million people in downstream towns and Mianyang city, located 85 km downstream. Chinese authorities had to evacuate parts of the city until the Tangjiashan landslide dam was artificially breached by a spillway, and the lake was drained. We propose an integrated approach to simulate the dam-breach floods for a number of possible scenarios, to evaluate the severity of the threat to Mianyang city. Firstly, the physically-based BREACH model was applied to predict the flood hydrographs at the dam location, which were calibrated with observational data of the flood resulting from the artificial breaching. The output hydrographs from this model were inputted into the 1-D–2-D SOBEK hydrodynamic model to simulate the spatial variations in flood parameters. The simulated flood hydrograph, peak discharge and peak arrival time at the downstream towns fit the observations. Thus this approach is capable of providing reliable predictions for the decision makers to determine the mitigation plans. The sensitivity analysis of the BREACH model input parameters reveals that the average grain size, the unit weight and porosity of the dam materials are the most sensitive parameters. The variability of the dam material properties causes a large uncertainty in the estimation of the peak flood discharge and peak arrival time, but has little influence on the flood inundation area and flood depth downstream. The effect of cascading breaches of smaller dams downstream of the Tangjiashan dam was

  3. COMPARISON OF CALCULATED AND OBSERVED SEISMIC ACCELERATIONS IN COMPOSITE-TYPE ROCK-FILL DAM OF THE DNESTROVSKAYA HYDRO-ELECTRIC POWER PLANT DURING EXPERIMENTAL EXPLOSIONS

    Directory of Open Access Journals (Sweden)

    A. A. Matvienko

    2016-01-01

    Full Text Available A methodology for determination of seismic accelerations in earth dams has been developed within the framework of seismic resistance wave theory. In this case we take into account an influence of the dam foundation and seismic wave emission into it. The methodology is based on numerical solution of the dynamic problem while using a finite difference method. A software program SGD “Determination of seismic acceleration in the earth dam” has been prepared on the basis of the developed methodology. The program allows to evaluate ordinates of calculation orthographic representations for acceleration throughout the dam height for all time moments. Thus, it is possible to obtain the most dangerous acceleration orthographic representations at direct and reverse seismic actions. The papers presents verification (compliance test of calculated and observed seismic accelerations for the rock-fill dam of the Dnestrovskaya Hydro-Electric Power Plant No 1. The observed seismic accelerations have been obtained during experimental explosions. The calculated seismic accelerations have been obtained in accordance with the proposed methodology for determination of seismic accelerations in the earth dams. A comparative analysis of calculation results with the data of field observations has demonstrated that a maximum difference between extreme accelerations obtained by calculation, and during field observations, do not exceed 10.11 % for the dam crest, and 6.56 % for its bottom. The obtained results permit to recommend the developed program for engineering calculations of seismic accelerations in the earth dams. The program application will make it possible to determine seismic acceleration in the earth dam with sufficient reliability.

  4. Wildlife Habitat Impact Assessment, Chief Joseph Dam Project, Washington : Project Report 1992.

    Energy Technology Data Exchange (ETDEWEB)

    Kuehn, Douglas; Berger, Matthew

    1992-01-01

    Under the Pacific Northwest Electric Power Planning and Conservation Act of 1980, and the subsequent Northwest Power Planning Council`s Columbia River Basin Fish and Wildlife Program, a wildlife habitat impact assessment and identification of mitigation objectives have been developed for the US Army Corps of Engineer`s Chief Joseph Dam Project in north-central Washington. This study will form the basis for future mitigation planning and implementation.

  5. How Big of an Effect Do Small Dams Have? Using Geomorphological Footprints to Quantify Spatial Impact of Low-Head Dams and Identify Patterns of Across-Dam Variation

    Science.gov (United States)

    Costigan, Katie H.; Daniels, Melinda D.

    2015-01-01

    Longitudinal connectivity is a fundamental characteristic of rivers that can be disrupted by natural and anthropogenic processes. Dams are significant disruptions to streams. Over 2,000,000 low-head dams (ecology are largely untested. Progress for research and conservation is impaired by not knowing the magnitude of low-head dam impacts. Based on the geomorphic literature, we refined a methodology that allowed us to quantify the spatial extent of low-head dam impacts (herein dam footprint), assessed variation in dam footprints across low-head dams within a river network, and identified select aspects of the context of this variation. Wetted width, depth, and substrate size distributions upstream and downstream of six low-head dams within the Upper Neosho River, Kansas, United States of America were measured. Total dam footprints averaged 7.9 km (3.0–15.3 km) or 287 wetted widths (136–437 wetted widths). Estimates included both upstream (mean: 6.7 km or 243 wetted widths) and downstream footprints (mean: 1.2 km or 44 wetted widths). Altogether the six low-head dams impacted 47.3 km (about 17%) of the mainstem in the river network. Despite differences in age, size, location, and primary function, the sizes of geomorphic footprints of individual low-head dams in the Upper Neosho river network were relatively similar. The number of upstream dams and distance to upstream dams, but not dam height, affected the spatial extent of dam footprints. In summary, ubiquitous low-head dams individually and cumulatively altered lotic ecosystems. Both characteristics of individual dams and the context of neighboring dams affected low-head dam impacts within the river network. For these reasons, low-head dams require a different, more integrative, approach for research and management than the individualistic approach that has been applied to larger dams. PMID:26540105

  6. Dynamic Analysis of an Inflatable Dam Subjected to a Flood

    OpenAIRE

    Lowery, Kristen Mary

    1997-01-01

    A dynamic simulation of the response of an inflatable dam subjected to a flood was carried out to determine the survivability envelope of the dam where it can operate without rupture, or overflow. A fully nonlinear free-surface flow was applied in two dimensions using a mixed Eulerian-Lagrangian formulation. An ABAQUS finite element model was used to determine the dynamic structural response of the dam. The problem was solved in the time domain which allows the prediction of a number ...

  7. Predicting surfacing internal erosion in moraine core dams

    OpenAIRE

    Rönnqvist, Hans

    2010-01-01

    Dams that comprise broadly and widely graded glacial materials, such as moraines, have been found to be susceptible to internal erosion, perhaps more than dams of other soil types. Internal erosion washes out fine-grained particles from the filling material; the erosion occurs within the material itself or at an interface to another dam zone, depending on the mode of initiation. Whether or not internal erosion proceeds depend on the adequacy of the filter material. If internal erosion is allo...

  8. Methodology for risk assessment of collapses of torrent check dams

    OpenAIRE

    Martinčič, Manica

    2014-01-01

    Slovenia has a lot of torrential check dams, but until now there was no uniform method one could apply in order to perform a review of the torrential check dams' condition and to assess their physical vulnerability. In 2013, we assessed the risk of torrential check dams on Suhelj, Belca and Pišnica torrents by applying the risk assessment methodology for large dams. Since, for various reasons, the results were deemed useless, we decided to adjust the risk assessment model for torrential ch...

  9. the effect of age of dam on weaning mass for ftve dam breed types in ...

    African Journals Online (AJOL)

    at an earlier age than the Charolais, Simmentaler and Dual Purpose types. This was probably due to their rate of maturity. These results indicate that when the average dam-age is low in a herd, the early maturing types can be more productive than later maturing types. Extrapolating this data to extensive conditions, where ...

  10. Dam Design can Impede Adaptive Management of Environmental Flows: A Case Study from the Opuha Dam, New Zealand

    Science.gov (United States)

    Lessard, JoAnna; Murray Hicks, D.; Snelder, Ton H.; Arscott, David B.; Larned, Scott T.; Booker, Doug; Suren, Alastair M.

    2013-02-01

    The Opuha Dam was designed for water storage, hydropower, and to augment summer low flows. Following its commissioning in 1999, algal blooms (dominated first by Phormidium and later Didymosphenia geminata) downstream of the dam were attributed to the reduced frequency and magnitude of high-flow events. In this study, we used a 20-year monitoring dataset to quantify changes associated with the dam. We also studied the effectiveness of flushing flows to remove periphyton from the river bed. Following the completion of the dam, daily maximum flows downstream have exceeded 100 m3 s-1 only three times; two of these floods exceeded the pre-dam mean annual flood of 203 m3 s-1 (compared to 19 times >100 m3 s-1 and 6 times >203 m3 s-1 in the 8 years of record before the dam). Other changes downstream included increases in water temperature, bed armoring, frequency of algal blooms, and changes to the aquatic invertebrate community. Seven experimental flushing flows resulted in limited periphyton reductions. Flood wave attenuation, bed armoring, and a shortage of surface sand and gravel, likely limited the effectiveness of these moderate floods. Floods similar to pre-dam levels may be effective for control of periphyton downstream; however, flushing flows of that magnitude are not possible with the existing dam infrastructure. These results highlight the need for dams to be planned and built with the capacity to provide the natural range of flows for adaptive management, particularly high flows.

  11. Hovercraft drill probes Saraji tailings dam

    Energy Technology Data Exchange (ETDEWEB)

    1991-09-01

    In early operations at BHP-Utah's Saraji Mine in central Queensland, quantities of coking coal were pumped into the tailings dam because the preparation plant's flotation circuit was unable to handle ultra-fines. A reverse circulating drilling rig mounted on a hovercraft was used to recover 22 samples (representing 9 metres of tailings from 11 x 8 x 0.09 metre cores) in an investigation into whether the tailings can now be treated economically. 1 fig.

  12. The World Commission on Dams + 10: Revisiting the Large Dam Controversy

    Directory of Open Access Journals (Sweden)

    Deborah Moore

    2010-06-01

    Full Text Available The World Commission on Dams (WCD was an experiment in multi-stakeholder dialogue and global governance concerned with a subject area – large dams – that was fraught with conflict and controversy. The WCD Report, Dams and Development: A New Framework for Decision-Making, was published in 2000 and accompanied by hopes that broad-based agreements would be forged on how to better manage water and energy development. Ten years later, this special issue of Water Alternatives revisits the WCD and its impacts, exploring the question: Is the WCD still relevant? The editorial team and the Guest Editors of this special issue of Water Alternatives have selected a range of 20 papers, 6 viewpoints, and 4 book reviews that help to illustrate the evolution in the dams debate. The goal of this special issue is to examine the influence and the impacts of the WCD on the dam enterprise, in general, and on the policies and practices of key stakeholders and institutions, and on the development outcomes for affected communities and environments, in particular. In this introduction, the Guest Editors provide an overview of the special issue, exploring the new drivers of dam development that have emerged during the last decade, including climate change and new financiers of dams, and describing the themes emerging from this diverse set of papers and viewpoints. This special issue demonstrates the need for a renewed multi-stakeholder dialogue at multiple levels. This would not be a redo of the WCD, but rather a rekindling and redesigning of processes and forums where mutual understanding, information-sharing, and norm-setting can occur. One of the most promising developments of the last decade is the further demonstration, in case studies described here, that true partnership amongst key stakeholders can produce transformative resource-sharing agreements, showing that many of the WCD recommendations around negotiated decision making are working in practice. We hope

  13. Quasi-stable Slope-Failure Dams in High Asia

    Science.gov (United States)

    Shroder, J. F.

    2010-12-01

    Collapses of steep mountain slopes in the Himalaya, Karakoram, Pamir, Hindu Kush, and Tibetan Plateau are well known as a result of:(1) generally high seismicity in active tectonic areas; (2) prior deglaciation leaving undercut, unstable cliffs; (3) present-day debuttressing of rock cliffs by glacial down-wasting in conditions of global warming; and (4) degradation of permafrost cohesion and water-ice cementation in high mountain slopes. Landslide dams across mountain rivers are also well known worldwide and generally do not endure for long because of the common landslide-lake outburst floods (LLOF) whose discharge is commonly sufficiently large to remove much of the dam in a short time. A number of massive slope-failure dams in south High Asia, however, have endured for centuries and require explanations for the length of duration, whereas recent examples require robust assessment for better predictive hazard analysis. Three main factors contribute to longevity of slope-failure dams: (1) mega-rocks >15-30 m that inhibit dam failure in overflow breaches; (2) mega-porosity wherein incoming discharge to the landslide lake is balanced by subterranean water through-flow within the landslide dam; (3) impermeable clay fills caused by remobilization of prior lacustrine-dammed sediment that impart dam strength to allow lasting integrity for a time, and (4) climate-change induced lake-level lowering. Several examples of long-lived or unusually stable, slope-failure dams associated with pronounced structural/tectonic associations include: (1) Pangong Tso, Ladakh and Tibet; (2) Lake Shewa, Afghanistan; (3) Sarez Lake, Tajikistan; and (4) Lake Hunza, Pakistan. Pangong Tso and Lake Shewa were emplaced thousands of years ago and only Lake Shewa shows some instability of the dam front where percolating water maintains lake level but may be causing new slumping. Sarez Lake behind the Usoi landslide dam was emplaced by an earthquake in 1911 and maintains its level by seepage. Lake

  14. Cascade dams influence on sediment characteristics and phosphorus distribution.

    Science.gov (United States)

    Rapin, Anne; Mourier, Brice; Rabiet, Marion; Malgorzata, Grybos; Kestens, Tim; Deluchat, Veronique

    2017-04-01

    Massive river artificialisation by dam construction, responding to the steadily increasing human demand of water and electricity leads to several environmental consequences, including alteration of hydrological dynamic and sediment discontinuity. Important decreases of water flows and sediment transport downstream impact phosphorus (P) flux to the ocean and its cycle, due to P sediment storage in dam reservoir. Moreover, the release of P from sediments may enhance eutrophication processes in dam reservoir. Our study focused on the influence of cascade dams on physical and chemical characteristics of sediments and particularly on P sedimentary speciation along river continuum. Considering these results, the potential of P release from dam reservoir sediments was appraised and compared to un-impacted river parts. In addition, key parameters controlling P release at sediment/water interface were evaluated. Champsanglard, Chézelles and Age are three consecutive hydroelectric reservoirs on Creuse River (France; respective surfaces area of 55 ha, 23 ha, 38 ha and approximative height of 20 m each) subjected to seasonal cyanobacterial blooms. Surface sediments (17 samples) were collected in dams and free-flow river sections (on a stretch of 17 km); chemical composition (Fe, Al, Ca, Mn and P), organic matter (OM) content, particle size distribution and P fractionation were analysed. An abrupt change in sediment granulometry from a coarse-medium sand to silt texture going through free-flow river to dam reservoirs was observed. The same assessment was made in regard to OM content (from 3 ± 3% in river parts to 18 ± 3% in dams) and total P (0.27 ± 0.11 mgP/g DW in river parts to 1.8 ± 0.3 mgP/gDW in dams). P enrichment in sediment from dam reservoir is due to the retention of fine size particles. Relation between total P content and sediment grain size within each dam reservoir highlighted the role of slowdown river flow occurring in dams. In Champsanglard reservoir

  15. Thermal effects of dams in the Willamette River basin, Oregon

    Science.gov (United States)

    Rounds, Stewart A.

    2010-01-01

    Methods were developed to assess the effects of dams on streamflow and water temperature in the Willamette River and its major tributaries. These methods were used to estimate the flows and temperatures that would occur at 14 dam sites in the absence of upstream dams, and river models were applied to simulate downstream flows and temperatures under a no-dams scenario. The dams selected for this study include 13 dams built and operated by the U.S. Army Corps of Engineers (USACE) as part of the Willamette Project, and 1 dam on the Clackamas River owned and operated by Portland General Electric (PGE). Streamflows in the absence of upstream dams for 2001-02 were estimated for USACE sites on the basis of measured releases, changes in reservoir storage, a correction for evaporative losses, and an accounting of flow effects from upstream dams. For the PGE dam, no-project streamflows were derived from a previous modeling effort that was part of a dam-relicensing process. Without-dam streamflows were characterized by higher peak flows in winter and spring and much lower flows in late summer, as compared to with-dam measured flows. Without-dam water temperatures were estimated from measured temperatures upstream of the reservoirs (the USACE sites) or derived from no-project model results (the PGE site). When using upstream data to estimate without-dam temperatures at dam sites, a typical downstream warming rate based on historical data and downstream river models was applied over the distance from the measurement point to the dam site, but only for conditions when the temperature data indicated that warming might be expected. Regressions with measured temperatures from nearby or similar sites were used to extend the without-dam temperature estimates to the entire 2001-02 time period. Without-dam temperature estimates were characterized by a more natural seasonal pattern, with a maximum in July or August, in contrast to the measured patterns at many of the tall dam sites

  16. Compiling an Open Database of Dam Inundation Areas on the Irrawaddy, Salween, Mekong, and Red River Basins

    Science.gov (United States)

    Cutter, P. G.; Walcutt, A.; O'Neil-Dunne, J.; Geheb, K.; Troy, A.; Saah, D. S.; Ganz, D.

    2016-12-01

    Dam construction in mainland Southeast Asia has increased substantially in recent years with extensive regional impacts including alterations to water regimes, the loss and degradation of natural forests and biodiversity, and reductions in soil and water quality. The CGIAR Water Land Ecosystem program (WLE) and partners maintain a comprehensive database of locations and other data relating to existing, planned, and proposed dams in the region's major transboundary rivers spanning areas in Thailand, Cambodia, Laos, Vietnam, Myanmar, and China. A recent regional needs assessment and specific stakeholder requests revealed the need for a dataset reflecting the inundation areas of these dams for use in measuring impacts to river ecology, analyzing disaster risk, monitoring land cover and land use change, evaluating carbon emissions, and assessing the actual and potential impacts to communities. In conjunction with WLE and other partners, SERVIR-Mekong, a regional hub of the USAID and NASA-supported SERVIR program, formulated an explicit procedure to produce this dataset. The procedure includes leveraging data from OpenStreetMap and other sources, creating polygons based on surface water classification procedures achieved via Google Earth Engine, manual digitizing, and modeling of planned/proposed dams based on a DEM and the location and planned height of dams. A quality assurance step ensures that all polygons conform to spatial data quality standards agreed upon by a wide range of production partners. When complete, the dataset will be made publicly available to encourage greater understanding and more informed decisions related to the actual and potential impacts of dams in the region.

  17. The Three Gorges Dam Affects Regional Precipitation

    Science.gov (United States)

    Wu, Liguang; Zhang, Qiang; Jiang, Zhihong

    2006-01-01

    Issues regarding building large-scale dams as a solution to power generation and flood control problems have been widely discussed by both natural and social scientists from various disciplines, as well as the policy-makers and public. Since the Chinese government officially approved the Three Gorges Dam (TGD) projects, this largest hydroelectric project in the world has drawn a lot of debates ranging from its social and economic to climatic impacts. The TGD has been partially in use since June 2003. The impact of the TGD is examined through analysis of the National Aeronautics and Space Administration (NASA) Tropical Rainfall Measuring Mission (TRMM) rainfall rate and Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature and high-resolution simulation using the Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) fifth-generation Mesoscale Model (MM5). The independent satellite data sets and numerical simulation clearly indicate that the land use change associated with the TGD construction has increased the precipitation in the region between Daba and Qinling mountains and reduced the precipitation in the vicinity of the TGD after the TGD water level abruptly rose from 66 to 135 m in June 2003. This study suggests that the climatic effect of the TGD is on the regional scale (approx.100 km) rather than on the local scale (approx.10 km) as projected in previous studies.

  18. 75 FR 34476 - Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2010-06-17

    ... Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of Reclamation... Interior (Secretary) is renewing the charter for the Glen Canyon Dam Adaptive Management Work Group. The purpose of the Adaptive Management Work Group is to advise and to provide recommendations to the Secretary...

  19. 21 CFR 872.6300 - Rubber dam and accessories.

    Science.gov (United States)

    2010-04-01

    ...) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6300 Rubber dam and accessories. (a) Identification. A rubber dam and accessories is a device composed of a thin sheet of latex with a hole in the... cavity preparation. The device is stretched around a tooth by inserting a tooth through a hole in the...

  20. Major Dams of the United States - Direct Download

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This map layer portrays major dams of the United States, including Puerto Rico and the U.S. Virgin Islands. The map layer was created by extracting dams 50 feet or...

  1. Damming Tropical Island Streams: Problems, Solutions, and Alternatives.

    Science.gov (United States)

    JAMES G. MARCH; JONATHAN P. BENSTEAD; CATHERINE M. PRINGLE; FREDERICK N. SCATENA

    2003-01-01

    The combination of human population growth, increased water usage, and limited groundwater resources often leads to extensive damming of rivers and streams on tropical islands. Ecological effects of dams on tropical islands can be dramatic, because the vast majority of native stream faunas (fishes, shrimps, and snails) migrate between freshwater and saltwater during...

  2. Iterative analysis of concrete gravity dam-nonlinear foundation ...

    African Journals Online (AJOL)

    user

    Keywords: Concrete gravity dam; dam-foundation interaction; iterative algorithm; Duncan-Chang model; viscous dashpots. 1. Introduction. Considerable research has been conducted on the subject of dynamic analysis of structure-foundation system. The various numerical methods developed for the analysis of dynamic ...

  3. 76 FR 24516 - Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2011-05-02

    ... Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of Reclamation, Interior. ACTION: Notice of public meeting. SUMMARY: The Glen Canyon Dam Adaptive Management Work Group...-575) of 1992. The AMP includes a Federal advisory committee, the AMWG, a technical work group (TWG), a...

  4. 78 FR 21415 - Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2013-04-10

    ... Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of Reclamation, Interior. ACTION: Notice of public meeting. SUMMARY: The Glen Canyon Dam Adaptive Management Work Group..., the AMWG, a technical work group, a Grand Canyon Monitoring and Research Center, and independent...

  5. 78 FR 7810 - Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2013-02-04

    ... Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of Reclamation, Interior. ACTION: Notice of public meeting. SUMMARY: The Glen Canyon Dam Adaptive Management Work Group.... L. 102-575) of 1992. The AMP includes a Federal advisory committee, the AMWG, a technical work group...

  6. 77 FR 9265 - Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2012-02-16

    ... Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of Reclamation, Interior. ACTION: Notice of public meeting. SUMMARY: The Glen Canyon Dam Adaptive Management Work Group... Federal advisory committee, the AMWG, a technical work group (TWG), a Grand Canyon Monitoring and Research...

  7. METHOD OF OPTIMAL OPERATION OF SMALL DAM IN ...

    African Journals Online (AJOL)

    2015-01-15

    Jan 15, 2015 ... We consider that frequency of the month rainfall of the order of P=75% may well ensure a minor risk towards the need of irrigation. *DETERMINATION OF LOSS OF WATER IN DAM. It was agreed to consider that the losses of water in dam are evaporative losses ev. P , from the plan of water and filtration fil.

  8. The Grand Ethiopian Renaissance Dam and Ethiopia's Succession ...

    African Journals Online (AJOL)

    ... change in the pertinence of the norms of international law nor to any altruistic revision of positions in the lower reaches of the river, but rather to its belated awakening in pursuing the Grand Ethiopian Renaissance Dam (GERD) as a national project of multifarious impact. Key terms: The Grand Ethiopian Renaissance Dam, ...

  9. Walden North Dam overtopping : emergency response and rehabilitation

    Energy Technology Data Exchange (ETDEWEB)

    Dyer, S. [FortisBC Inc., South Slocan, BC (Canada); McCreanor, J. [Acres International Ltd., Calgary, AB (Canada); Cronin, D.L.R.; Daw, D. [Acres International Ltd., Vancouver, BC (Canada)

    2004-09-01

    This paper described the events that led to the overtopping of the Walden North Dam during a heavy rainfall in June 2002, resulting in a breach around an abutment wall. The dam is part of a run-of-river hydro development on Cayoosh Creek near Lillooet, British Columbia. The Walden North Dam was a low, 46 meter wide concrete dam with a single radial gate. The dam overtopping was attributed to failure of the radial gate hoist. Prior to this event, the dam had been classified by the British Columbia Dam Safety Authorities as a high and then a low consequence category of failure. As facility managers, Aquila Networks Canada Ltd. established an immediate action plan to stabilize the situation and resume normal power production by applying the following priorities: (1) ensure safety of workers and the public, (2) limit further damage to the dam and other facilities, (3) ensure environmental protection, and (4) continue to operate the generation units. Local authorities were informed to evacuate a downstream campsite and environmental agencies were contacted along with safety regulators. Repairs included demolition of the damaged portion of the structure and construction a new two-bay gate/stoplog spillway and bridge. Construction was completed by September 2003 according to the requirements of the Department of Fisheries and Oceans for minimum flow, accurate control of fish flows and environmental monitoring of the stream area. 10 figs.

  10. Evaluation of flora diversity and abundance in Awba Dam Tourism ...

    African Journals Online (AJOL)

    The site is rich in flora diversity; a potential for ecotourism development. Much of the reservoir area were overgrown with invasive hydro-flora species suggesting need for effective management and conservation of the flora resources as well as the touristic capacity of Awba dam tourism centre. Keywords: Awba dam tourism ...

  11. Measures of struggle against appearance of cracks in earth dams

    Directory of Open Access Journals (Sweden)

    Ibraeva Yulia

    2016-01-01

    Full Text Available The article describes a method calculation of the basic parameters of the transverse rows of pile of simple printed or precast dam. As well, in this article have been shown all the necessary formulas for this calculation and have been proposed solutions to prevent cracking in the dams.

  12. Estimation of permanent displacements of the Tehri dam in the ...

    Indian Academy of Sciences (India)

    The objective of this paper is to estimate permanent displacements of Tehri dam due to an earthquake of magnitude M w = 8 · 5 , the occurrence of which has a high probability in the region, and for an earthquake of magnitude M w = 7 · 0 , for which the dam has been currently designed. A two-dimensional finite element ...

  13. The Political Ecology of Chinese Large Dams in Cambodia: Implications, Challenges and Lessons Learnt from the Kamchay Dam

    Directory of Open Access Journals (Sweden)

    Giuseppina Siciliano

    2016-09-01

    Full Text Available Given the opportunities offered by foreign investment in energy infrastructure mostly by Chinese firms, the Government of Cambodia is giving high priority to developing hydropower resources for reducing energy poverty and powering economic growth. Using a “Political ecology of the Asian drivers” framework, this paper assesses China’s involvement in the development of large dams’ in Cambodia and its impacts on the access of natural resources such as water and energy by dam builders, local communities and the government. This analysis is based on 61 interviews and 10 focus group discussions with affected communities, institutional actors, Chinese dam builders and financiers in relation to the first large Chinese dam built in Cambodia: the Kamchay dam. Based on the results of the analysis this paper makes recommendations on how to improve the planning, implementation and governance of future large dams in Cambodia.

  14. Stability of earth dam with a vertical core

    Directory of Open Access Journals (Sweden)

    Orekhov Vyacheslav Valentinovich

    2016-01-01

    Full Text Available Earth dam with impervious element in the form of asphaltic concrete core is currently the most promising type of earth dams (due to simple construction technology and universal service properties of asphaltic concrete and is widely used in the world. However, experience in the construction and operation of high dams (above 160 m is not available, and their work is scarcely explored. In this regard, the paper discusses the results of computational prediction of the stress-strain state and stability of a high earth dam (256 m high with the core. The authors considered asphaltic concrete containing 7 % of bitumen as the material of the core. Gravel was considered as the material of resistant prisms. Design characteristics of the rolled asphaltic concrete and gravel were obtained from the processing of the results of triaxial tests. The calculations were performed using finite element method in elastoplastic formulation and basing on the phased construction of the dam and reservoir filling. The research shows, that the work of embankment dam with vertical core during filling of the reservoir is characterized by horizontal displacement of the lower resistant prism in the tailrace and the formation of a hard wedge prism descending along the core in the upper resistant prism. The key issue of the safety assessment is to determine the safety factor of the overall stability of the dam, for calculation of which the destruction of the earth dam is necessary, which can be done by reducing the strength properties of the dam materials. As a results of the calculations, the destruction of the dam occurs with a decrease in the strength characteristics of the materials of the dam by 2.5 times. The dam stability depends on the stability of the lower resistant prism. The destruction of its slope occurs on the classical circular-cylindrical surface. The presence of a potential collapse surface in the upper resistant prism (on the edges of the descending wedge does

  15. Neotectonics of the Vajont dam site

    Science.gov (United States)

    Mantovani, Franco; Vita-Finzi, Claudio

    2003-08-01

    The disastrous Vajont landslide (NE Italy) of 9 October 1963 is generally thought to have occurred on an existing failure surface. Reassessment of the morphological and structural evidence suggests that movement was on a normal fault plane which had juxtaposed Cretaceous limestone and highly fractured rock debris, thus rendering the dam site unusually susceptible to massive sliding. The proposed fault is consistent in strike with the regional lineament pattern. Although movement was triggered by the combined effects of heavy rainfall and changes in reservoir level, there is circumstantial evidence that seismicity played a contributory part in mobilising the slide by increasing pore pressure at the base of the slide as well as by any associated shaking.

  16. Establishing baseline biodiversity data prior to hydroelectric dam construction to monitoring impacts to bats in the Brazilian Amazon.

    Science.gov (United States)

    Bobrowiec, Paulo Estefano D; Tavares, Valéria da Cunha

    2017-01-01

    The modification of Amazonian rivers by the construction of megaprojects of hydroelectric dams has widely increased over the last decade. Robust monitoring programs have been rarely conducted prior to the establishment of dams to measure to what extent the fauna, and its associated habitats may be affected by upcoming impacts. Using bats as models, we performed analyses throughout the area under the influence of the Santo Antônio hydroelectric dam, Southwestern Brazilian Amazonia before its construction to estimate how the fauna and its associated habitats would be affected by the upcoming impacts. We surveyed bats in 49 plots distributed along the areas going to be inundated by the dam and those remaining dry. As predictors for the species distribution, we tested the variables of vegetation structure and topography. Species composition largely differed between the dry plots and the plots located in areas that will be flooded, and this was strongly associated with the variables of forest basal area and elevation. Vegetation-related variables also had strong influence on the guilds distribution. The flooding of lower elevations areas is expected to negatively affect the species number and abundance of frugivorous species. In contrast, it is likely that animalivores will be less vulnerable to dam-induced flooding, since they were abundant in the areas not expect to be inundated. We urge for the implementation of studies to predict impacts caused by large hydroelectric dams, including tests of the influence of the local conditions that shape diversity to avoid massive losses of the biota, and to build preventive monitoring and management actions.

  17. Verifying Pressure of Water on Dams, a Case Study

    Directory of Open Access Journals (Sweden)

    Temel Bayrak

    2008-09-01

    Full Text Available Sensing and monitoring deformation pattern of dams is often one of the most effective ways to understand their safety status. The main objective of the present study is to find the extent to which rising reservoir level affects the mechanism of deformation of the Yamula dam under certain changes in the reservoir level conditions during the first filling period. A new dynamic deformation analysis technique was developed to analyze four geodetic monitoring records consisting of vertical and horizontal displacements of nine object points established on the dam and six reference points surrounding it, to see whether the rising reservoir level is responsible for the vertical and horizontal deformations during the first filling period. The largest displacements were determined in the middle points of the dam construction. There is an apparent linear relationship between the dam subsidence and the reservoir level. The dynamic deformation model was developed to model this situation. The model infers a causative relationship between the reservoir level and the dam deformations. The analysis of the results determines the degree of the correlation between the change in the reservoir level and the observed structural deformation of the dam.

  18. Environmental and dam effects on cannibalism in Wistar rat litters

    Directory of Open Access Journals (Sweden)

    Graziela Tarôco

    2015-08-01

    Full Text Available The factors related to cannibalistic behavior of dams in a Wistar rat colony are identified and analyzed. The maternal genetic effects were tested as a random effect by the method of generalized linear models. The season at parturition, the dam´s age at parturition and the density of the room at parturition were tested as fixed effects, whereas the litter size at birth was tested as a co-variable. The genetic effect of the dam was significant for the number of cannibalized pups. Although the season at parturition, the dam´s age and room density on the day of parturition were not individually significant (p > 0.05, most of the interactions between the variation sources were significant (p < 0.05. Cannibalism occurred mostly in dams aged over 241 days, with parturition during spring. So that occurrences of cannibalism could be avoided, dams with the smallest number of cannibalized pups should be selected, coupled to dams younger than 241 days, breeding during spring. The above strategies may reduce the number of couples in the vivarium and increase their production efficiency.

  19. Responses of riparian reptile communities to damming and urbanization

    Science.gov (United States)

    Hunt, Stephanie D.; Guzy, Jacquelyn C.; Price, Steven J.; Halstead, Brian J.; Eskew, Evan A.; Dorcas, Michael E.

    2013-01-01

    Various anthropogenic pressures, including habitat loss, threaten reptile populations worldwide. Riparian zones are critical habitat for many reptile species, but these habitats are also frequently modified by anthropogenic activities. Our study investigated the effects of two riparian habitat modifications-damming and urbanization-on overall and species-specific reptile occupancy patterns. We used time-constrained search techniques to compile encounter histories for 28 reptile species at 21 different sites along the Broad and Pacolet Rivers of South Carolina. Using a hierarchical Bayesian analysis, we modeled reptile occupancy responses to a site's distance upstream from dam, distance downstream from dam, and percent urban land use. The mean occupancy response by the reptile community indicated that reptile occupancy and species richness were maximized when sites were farther upstream from dams. Species-specific occupancy estimates showed a similar trend of lower occupancy immediately upstream from dams. Although the mean occupancy response of the reptile community was positively related to distance downstream from dams, the occupancy response to distance downstream varied among species. Percent urban land use had little effect on the occupancy response of the reptile community or individual species. Our results indicate that the conditions of impoundments and subsequent degradation of the riparian zones upstream from dams may not provide suitable habitat for a number of reptile species.

  20. Daily Water Quality Forecasting System Linking Weather, Watersheds, Rivers and Dam Reservoirs Based On Numerical Simulations

    Science.gov (United States)

    Byun, C. Y.; Lee, S. J.; Oh, S. S.; Hwang, H. S.; Kim, H. S.

    2016-12-01

    Many large dam reservoirs and rivers, which are the most important water resources in Korea, are under increased pressure from various environmental issues, including an excessive growth of phytoplanktons(algae) because of eutrophication and long-term impact of turbid water on the water supply system after flood events. However most of organizations managing water quality respond to these problems after turbid water or algal blooms happen. But nowadays Korea Water Resources Corporation(K-water) has been upgrading its water quality management system to establish a predictive and preventive management paradigm not only in dam reservoirs but also in rivers and watersheds. For these, K-water has been setting up water quality forecasting systems using 3-dimensional hydrodynamic water quality model ELCOM-CAEDYM to all reservoirs, HSPF(Hydrological Simulation Program Fortran) to 4 watersheds and CE-QUAL-W2 to 4 main rivers in Korean Peninsula. For efficient operation and real time water quality modeling of 3 different models, K-water have also developed integrated software and centralized simulation hardware machines which run all models, link all in- and output together and visualizes results every day. With systems, K-water has been forecasting water quality of all reservoirs and rivers according to 5 days weather forecasting results and applying to predict the water quality changes in dams, rivers and watersheds in advance according to operation rule changes and climate changes.

  1. Hydraulic characteristics and dynamics of beaver dams in a Midwestern U.S. agricultural waershed

    Science.gov (United States)

    M.C. McCullough; D.E. Eisenhauer; M.G. Dosskey; D.M. Admiraal

    2006-01-01

    Populations of Noth America beaver (castor canadensis) have increased in the past decades throughout the Midwestern U.S., leading to an increase in the frequency of beaver dams in small streams. Beaver dams form ponds and slow water velocity. Multiple dams create a stair-step effect on the water surface profile. The hydraulic and geomorphic influence of beaver dams on...

  2. Management of agro-pastoral dams in Benin: stakeholders, institutions and rehabilitation research

    NARCIS (Netherlands)

    Kpéra, G.N.; Aarts, N.; Saïdou, A.; Tossou, R.C.; Eilers, C.H.A.M.; Mensah, G.A.; Sinsin, B.A.; Kossou, D.K.; van der Zijpp, A.J.

    2012-01-01

    Agro-pastoral dams are waterholes constructed to provide water for livestock and for agricultural development. In Benin, agro-pastoral dams are managed by dam management committees. This study seeks to (1) characterize the stakeholders involved in agro-pastoral dam use and management, (2) identify

  3. Management of agro-pastoral dams in Benin: Stakeholders, institutions and rehabilitation research

    NARCIS (Netherlands)

    Kpera, G.N.; Aarts, N.; Saidou, A.; Tossou, R.C.; Eilers, C.H.A.M.; Mensah, G.A.; Sinsin, B.; Kossou, D.K.; Zijpp, van der A.J.

    2012-01-01

    Agro-pastoral dams are waterholes constructed to provide water for livestock and for agricultural development. In Benin, agro-pastoral dams are managed by dam management committees. This study seeks to (1) characterize the stakeholders involved in agro-pastoral dam use and management, (2) identify

  4. Linking Three Gorges Dam and downstream hydrological regimes along the Yangtze River, China

    NARCIS (Netherlands)

    Mei, X.; Dai, Z.; Van Gelder, P.H.A.J.M.; Gao, J.

    2015-01-01

    The magnitude of anthropogenic influence, especially dam regulation, on hydrological system is of scientific and practical value for large river management. As the largest dam in the world by far, Three Gorges Dam (TGD) is expected to be a strong evidence on dam impacts on downstream hydrological

  5. Route-Specific Passage Proportions and Survival Rates for Fish Passing through John Day Dam, The Dalles Dam, and Bonneville Dam in 2010 and 2011

    Energy Technology Data Exchange (ETDEWEB)

    Ploskey, Gene R.; Weiland, Mark A.; Carlson, Thomas J.

    2012-06-04

    This report fulfills a request of the U.S. Army Engineer District, Portland, Oregon, to produce an interim report of estimates of route-specific fish passage proportions and survival rates for lower Columbia River dams in 2010 and 2011. The estimates are needed to update the Compass Model for the Columbia River Treaty and the new Biological Opinion before detail technical reports are published in late 2012. This report tabulates route-specific fish-passage proportions and survival rates for steelhead and Chinook salmon smolts passing through various sampled routes at John Day Dam, The Dalles Dam, and Bonneville Dam in 2010 and 2011. Results were compiled from analyses of data acquired in spring 2010 and 2011 studies that were specifically designed to estimate dam-passage and forebay-to-tailrace survival rates, travel time metrics, and spill passage efficiency, as stipulated by the 2008 Federal Columbia River Power System Biological Opinion and the Columbia Basin Fish Accords. The study designs allowed for estimation of route-specific fish passage proportions and survival rates as well as estimation of forebay-passage survival, all of which are summarized herein.

  6. Global perturbation of organic carbon cycling by river damming

    Science.gov (United States)

    Maavara, Taylor; Lauerwald, Ronny; Regnier, Pierre; van Cappellen, Philippe

    2017-05-01

    The damming of rivers represents one of the most far-reaching human modifications of the flows of water and associated matter from land to sea. Dam reservoirs are hotspots of sediment accumulation, primary productivity (P) and carbon mineralization (R) along the river continuum. Here we show that for the period 1970-2030, global carbon mineralization in reservoirs exceeds carbon fixation (Pchanging age distribution of dams. We further estimate that at the start of the twenty-first century, in-reservoir burial plus mineralization eliminated 4.0+/-0.9 Tmol per year (48+/-11 Tg C per year) or 13% of total organic carbon (OC) carried by rivers to the oceans. Because of the ongoing boom in dam building, in particular in emerging economies, this value could rise to 6.9+/-1.5 Tmol per year (83+/-18 Tg C per year) or 19% by 2030.

  7. Elwha Master Datafile - Elwha dam removal neashore monitoring

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Removal of two dams on the Elwha River, Washington will help restore natural sediment processes to the coastal environment near the river mouth. We are interested in...

  8. Eutrophication levels of some South African impoundments III. Roodeplaat Dam

    CSIR Research Space (South Africa)

    Steyn, DJ

    1976-01-01

    Full Text Available . The purpose of the study was to determine the present eutrophication status of Roodeplaat dam and the effect of either increased discharges of secondary treated sewage effluents....

  9. Determination of trophic situation of Sarimsakli Dam Lake (Kayseri ...

    African Journals Online (AJOL)

    msakl. Dam Lake from May 2001 to June 2002 monthly to determine the trophic situation of lake. Additionally, physical parameters of water such as temperature, dissolved oxygen, electrical conductivity (EC), pH, light permeability were measured in ...

  10. Dam Failure Effects on Local/Regional Critical Infrastructures

    Directory of Open Access Journals (Sweden)

    Pîrvuleţu Marius-Eugen

    2016-09-01

    Full Text Available The paper will focus on multi-hazard assessment following the failure of the Ezer dam on Jijia river. All induced risks are analyzed in terms of critical infrastructure protection, considering three possible failure scenarios.

  11. Greenhouse gas emissions from Brazil’s Amazonian hydroelectric dams

    Science.gov (United States)

    Fearnside, Philip M.

    2016-01-01

    Tropical dams are often falsely portrayed as ‘clean’ emissions-free energy sources. The letter by de Faria et al (2015 Environ. Res. Lett. 10 124019) adds to evidence questioning this myth. Calculations are made for 18 dams that are planned or under construction in Brazilian Amazonia and show that emissions from storage hydroelectric dams would exceed those from electricity generation based on fossil fuels. Fossil fuels need not be the alternative, because Brazil has vast potential for wind and solar power as well as opportunities for energy conservation. Because dam-building is rapidly shifting to humid tropical areas, where emissions are higher than in other climatic zones, the impact of these emissions needs to be given proper weight in energy-policy decisions.

  12. Bed Sediment Monitoring of Multiple Contiguous Small Dam Removals

    Science.gov (United States)

    Galster, J. C.; Wyrick, J. R.

    2010-12-01

    Dam removal is crucial for reconnecting river habitats, restoring passage of fish and other aquatic organisms, and restoring the free flow of water and sediment. However, removal of obsolete dams is often resisted due to concerns of releasing sediment and initiating channel instability. Two dams on the Musconetcong River in northern New Jersey have been removed as part of a watershed-wide effort to remove or breach all major obstructions to restore the river to its original free-flowing state. The two dams were consecutively situated 1 kilometer apart and their removals provided an opportunity to study the geomorphic response in the form of bed elevation changes and sediment size through pre- and post-removal monitoring. Initial geomorphic surveys of the riverbed in the vicinity of and between the two dams have shown areas of erosion and deposition. These surveys have established a set of control points along the river channel between the two dams, and confirm the downstream movement of a sediment plume and localized areas of erosion. At the upstream dam, comparisons pre- and post-dam removal surveys show greater than 100 cubic meters of sediment being both eroded and deposited within the site. Most but not all of the erosion occurred around the newly exposed sediment bar upstream of the former dam, where the thalweg has reestablished itself following the dam’s removal. Areas that were excavated during removal have experienced deposition. Most of the deposition occurred downstream and on the left-hand bank. Due to the two low flow culverts in the former dam, a mid-channel sediment bar formed but has subsequently eroded. At the downstream dam site, erosion has removed up to 1.1 m of sediment from the bed in places while depositing up to 0.5 m sediment in others. As sediment from the former impoundment migrated through the project site, areas excavated during the removal became areas of deposition following the removal, and; alternately, areas in the channel

  13. STUDY ON TEMPERATURE DISTRIBUTION DUE TO FREEZING AND THAWING AT THE FENGMAN CONCRETE GRAVITY DAM

    Directory of Open Access Journals (Sweden)

    He Yu

    2011-01-01

    Full Text Available Freezing and thawing damage is one of the major problems of the Fengman concrete dam. Based on the temperature records of the dam, appropriate heat transfer boundary conditions in the dam body are suggested. A three-dimensional finite element model is used to determine annual variation of temperature field of the dam as a case study. The deterioration problem of concrete dam owing to freezing and thawing effect is investigated.

  14. Riparian Vegetation Encroachment Ratios in rivers below large Dams

    Science.gov (United States)

    Garcia de Jalón, Diego; Martínez-Fernández, Vanesa; González del Tánago, Marta

    2017-04-01

    Large Dams and reservoirs change the natural flow regime and consequently cause many alterations in riparian vegetation dynamics which may be assessed at different spatial and temporal scales. In Mediterranean regions flow regulation is frequently associated with irrigation. Regulated rivers with this purpose very often show reduced discharges during the wet season when the reservoir is being filled and increased discharges during the dry season when irrigation takes place. This type of regulation frequently promotes riparian vegetation growth as soil moisture levels are increased during summer when a natural drought would otherwise limit its growth. Additionally, flow regulation by large dams promotes the aging of late seral riparian vegetation reducing the frequency of flood disturbance and consequently, the potential recruitment of pioneer species. In this work we study the response of woody riparian vegetation to flow regulation by large dams in four rivers from Central Spain: Jarama, Manzanares, Guadalix and Alberche. The aim is to quantify the annual vegetation encroachment ratios and to develop a model to understand the main controlling factors, such as floodplain and channel traits; flow regulation intensity; type of regulation; present vegetation canopy; distance to the dam; and time since dam commissioning. A temporal comparison using aerial photographs from 1956, 1966, 1972, 1991, 2011 and 2014 was done in thirteen river reaches downstream from large dams, to evaluate their morphological evolution.. Floodplain dimensions and channel and riparian vegetation changes were assessed by comparing different pre-dam and post-dam conditions. Recent coloured photographs with 0.5 m spatial resolution and older black-and-white photographs at 1:33 000 spatial scale were supplied by the National Geographic Institute of Spain (www.ign.es) and the Statistical Institute (www.madrid.org/nomecalles/Inicio.icm) from Madrid Community. Similar visual scales were used to cope

  15. Hydraulic fracturing of rock-fill dam

    Directory of Open Access Journals (Sweden)

    Jun-Jie WANG

    2016-02-01

    Full Text Available The condition in which hydraulic fracturing in core of earth-rock fill dam maybe induced, the mechanism by which the reason of hydraulic fracturing canbe explained, and the failure criterion by which the occurrence of hydraulicfracturing can be determined, were investigated. The condition dependson material properties such as, cracks in the core and low permeability ofcore soil, and “water wedging” action in cracks. An unsaturated core soiland fast impounding are the prerequisites for the formation of “waterwedging” action. The mechanism of hydraulic fracturing can be explainedby fracture mechanics. The crack propagation induced by water pressuremay follow any of mode I, mode II and mixed mode I-II. Based on testingresults of a core soil, a new criterion for hydraulic fracturing was suggested,from which mechanisms of hydraulic fracturing in the core of rock-fill damwere discussed. The results indicated that factors such as angle betweencrack surface and direction of principal stress, local stress state at thecrack, and fracture toughness KIC of core soil may largely affect theinduction of hydraulic fracturing and the mode of the propagation of thecrack.The condition in which hydraulic fracturing in core of earth-rock fill dam maybe induced, the mechanism by which the reason of hydraulic fracturing canbe explained, and the failure criterion by which the occurrence of hydraulicfracturing can be determined, were investigated. The condition dependson material properties such as, cracks in the core and low permeability ofcore soil, and “water wedging” action in cracks. An unsaturated core soiland fast impounding are the prerequisites for the formation of “waterwedging” action. The mechanism of hydraulic fracturing can be explainedby fracture mechanics. The crack propagation induced by water pressuremay follow any of mode I, mode II and mixed mode I-II. Based on testingresults of a core soil, a new criterion for hydraulic fracturing

  16. The Changing Political Dynamics of Dam Building on the Mekong

    Directory of Open Access Journals (Sweden)

    Philip Hirsch

    2010-06-01

    Full Text Available This paper explores political dynamics surrounding dam building in the Mekong river basin, prior to, and following, the World Commission on Dams (WCD. Since the 1950s, dam building in the Mekong river basin has been enmeshed in a complex and shifting geopolitical and eco-political landscape. The broad geopolitical sweep of US hegemony, Cold War, regional rapprochement and the rise of China has been superimposed on eco-political shifts between modernist belief in progress as mastery over nature, concerns of global and national environmental movements over dams and their impacts, and a galvanised Mekong environmentalism. During the first decade of the 21st century, mainstream dams on the Lower Mekong have returned to the agenda after having almost disappeared in favour of tributary projects. The growing strength and assertiveness of regional economic players has fundamentally altered the context of energy demand, planning and investment. New sources of finance have relocated the points of political leverage. Environment has been mustered in favour of, as well as in opposition to, dam construction in the contexts of climate-change discourses, protected-area linkage with dam projects, and an industry push for sustainability protocols and certification. Despite the Mekong being one of its focal basins, WCD has not played a prominent role in this transformed arena, yet many of the social and environmental concerns, stakeholder-based processes and safeguard-oriented approaches to hydropower planning that WCD brought to the fore have persisted in the wider ethos of politics around dams in the region.

  17. Phytoplankton composition of Sazlidere Dam lake, Istanbul, Turkey

    Directory of Open Access Journals (Sweden)

    Nese Yilmaz

    2013-05-01

    Full Text Available The phytoplankton composition of Sazlidere Dam lake was studied at 5 sampling sites between December 2003 - November 2005. A total of 67 taxa were recorded, representing Bacillariophyta (31, Chlorophyta (18, Cyanophyta (9, Chrysophyta (1, Cryptophyta (1, Dinophyta (3 and Euglenophyta (4. Bacillariophyta members constituted the dominant phytoplankton group in terms of species number. Nygaard’s compound index value and composition of phytoplankton indicate that the trophic state of Sazlidere Dam lake was changing from oligotrophic to mesotrophic.

  18. (Pisces, Cyprinidae) in Wuras Dam, a shallow, turbid impoundment

    African Journals Online (AJOL)

    an important role in energy cycling. In Wuras Dam, in which energy cycling is detritus-based, this species makes up 70"70 of the mass of fish (Pieterse & Keulder 1982). Wuras Dam is situated in the central highveld area of South. Africa (19°4O'S126°00E) in the Fourie Spruit, an annual tributary of the Modder River, Orange ...

  19. Seismic stability analysis of concrete gravity dams with penetrated cracks

    Directory of Open Access Journals (Sweden)

    Shou-yan JIANG

    2012-03-01

    Full Text Available The seismic stability of a cracked dam was examined in this study. Geometric nonlinearity and large deformations, as well as the contact condition at the crack site, were taken into consideration. The location of penetrated cracks was first identified using the concrete plastic-damage model based on the nonlinear finite element method (FEM. Then, the hard contact algorithm was used to simulate the crack interaction in the normal direction, and the Coloumb friction model was used to simulate the crack interaction in the tangential direction. After verification of numerical models through a case study, the seismic stability of the Koyna Dam with two types of penetrated cracks is discussed in detail with different seismic peak accelerations, and the collapse processes of the cracked dam are also presented. The results show that the stability of the dam with two types of penetrated cracks can be ensured in an earthquake with a magnitude of the original Koyna earthquake, and the cracked dam has a large earthquake-resistant margin. The failure processes of the cracked dam in strong earthquakes can be divided into two stages: the sliding stage and the overturning stage. The sliding stage ends near the peak acceleration, and the top block slides a long distance along the crack before the collapse occurs. The maximum sliding displacement of the top block will decrease with an increasing friction coefficient at the crack site.

  20. The Social, Historical, and Institutional Contingencies of Dam Removal

    Science.gov (United States)

    Magilligan, F. J.; Sneddon, C. S.; Fox, C. A.

    2017-06-01

    Environmental managers in the United States and elsewhere are increasingly perceiving dam removal as a critical tool for river restoration and enhancing watershed resilience. In New England, over 125 dams have been dismantled for ecological and economic rationales. A surprising number of these removals, including many that are ongoing, have generated heated conflicts between restoration proponents and local communities who value their dammed landscapes. Using a comparative case study approach, we examine the environmental conflict around efforts to remove six dams in New England. Each of these removal efforts followed quite different paths and resultant outcomes: successful removal, stalled removal, and failure despite seemingly favorable institutional conditions. Lengthy conflicts often transpired in instances where removals occurred, but these were successfully arbitrated by paying attention to local historical-geographical conditions conducive to removal and by brokering effective compromises between dam owners and the various local actors and stakeholders involved in the removal process. Yet our results across all cases suggest that these are necessary, but not sufficient conditions for restoration through dam removal since a similar set of conditions typified cases where removals are continuously stalled or completely halted. Scholars examining the intersection between ecological restoration and environmental politics should remain vigilant in seeking patterns and generalities across cases of environmental conflict in order to promote important biophysical goals, but must also remain open to the ways in which those goals are thwarted and shaped by conflicts that are deeply contingent on historical-geographical conditions and broader institutional networks of power and influence.

  1. Powder avalanche and catching dam interaction : influence of upstream dam slope ?

    Science.gov (United States)

    Caccamo, Paolo; Naaim-Bouvet, Florence; Faug, Thierry

    2013-04-01

    The influence of an obstacle on the dynamics of a finite-volume density current modelling a powder-snow avalanche was investigated. A constant volume of a dyed salt solution reproduced the small-scale aerosol flowing down an inclined channel immersed in a water tank. Reference tests in the absence of the obstacle characterized the dynamics parameters of the flow and then the influence of two different types of obstacles on these parameters was studied. Both of the obstacles represent a catching dam one with a vertical uphill face (OBS1) and the second one with an inclined uphill face 32° (OBS2). A high resolution acoustic velocimeter allows measurements on the 3D Flow velocity. For the reference avalanche, it was shown that the maximum velocity norm can be up to 18% greater than the maximum horizontal contribution (parallel to the slope) and that the ratio maximum velocity norm over front velocity varies between 1.75 and 2.2. THis ratio varies between 1.7 and 2.8 for the obstacles situation. In terms of protection effectiveness, laboratory tests showed that a catching dam with the upstream vertical to the slope is more efficient than a dam with an inclined upstream face. In presence of OBS2 the flow does not hit the obstacle but it rather passes smoothly over it, without any visible detachment from the surface. The ramp effect is remarkable and the avalanche reaches faster (in terms of time) a given point downstream from the obstacle. On the contrary, in the OBS1 configuration, the incoming flow hits the vertical wall and bursts. The flow is subjected to a strong deflection with the formation of a vertical jet.

  2. From dams to development justice: Progress with 'free, prior and informed consent' since the World Commission on Dams

    National Research Council Canada - National Science Library

    Joji Cariño; Marcus Colchester

    2010-01-01

      The World Commission on Dams (WCD) helped establish as development best practice the requirement to respect the right of indigenous peoples to give or withhold their 'free, prior and informed consent' (FPIC...

  3. Synthesis of the effects to fish species of two management scenarios for the secretarial determination on removal of the lower four dams on the Klamath

    Science.gov (United States)

    Hamilton,; Rondorf, Dennis W.; Hampton,; Quinones,; Simondet,; Smith,

    2011-01-01

    For decades the long-standing conflict in the Klamath River Basin over water and fish resources has persisted. In an effort to resolve these disputes, PacifiCorp and interested parties negotiated, wrote, and signed the Klamath Hydroelectric Settlement Agreement (KHSA) in 2010, calling for the potential removal of the four lower dams on the Klamath River mainstem. The KHSA established a process known as the Secretarial Determination, which includes 1) conducting new scientific studies and a re-evaluation of existing studies found in the FERC record and from other sources, and 2) evaluating the potential environmental and human effects of such an action pursuant to National Environmental Policy Act, California Environmental Quality Act, and other applicable laws.  In March 2012, the Secretary of the Interior will decide whether removal of these dams on the Klamath River: 1) will advance salmonid fisheries, and 2) is in the public interest. In this report, we summarize anticipated effects to fish resources under two management scenarios: 1) current conditions with dams in place and without the programs and actions in the Klamath Basin Restoration Agreement (KBRA), and 2) removal of the lower four dams plus programs and actions called for in the KBRA and KHSA. This information will aid the Secretary of the Interior in determining whether dam removal and implementation of KBRA will advance restoration of salmonid (salmon and trout) fisheries.

  4. Horizon Dam design, construction, and quality management

    Energy Technology Data Exchange (ETDEWEB)

    Patrick, B. [EBA Engineering Consultants Ltd., Nanaimo, BC (Canada); Sisson, R. [Canadian Natural Resources Ltd., Fort McMurray, AB (Canada)

    2010-07-01

    This paper discussed the design and construction of the Tar River Diversion Dam and the quality management system (QMS) used during construction. The project was unusual in that the company constructed the project using its own workforce, without contractors, under challenging schedule and site conditions. The topography, geology and geotechnical aspects of the site were discussed along with the embankment design, seepage control measures and construction execution. The QMS was designed to fit the needs of the unique construction execution strategy and meet safety, reliability, performance, and operation requirements, comply with all regulations and approval conditions, and identify and communicate risk to the appropriate entity. Specifications and construction procedures had to be modified to accommodate equipment operators trained with the skills and techniques of mine operations, not those associated with conventional civil construction projects. Foundation movement identified during construction required mid-build design changes, construction rescheduling, and additional deformation analyses to determine long-term stability. The QMS allowed changes in the understanding of site conditions to be quickly addressed and risks to be identified and cost-effectively mitigated. Design consultants were used to modify designs and appropriately identify and mitigate risks. The approach to embankment construction was successful because the QMS included processes for change management, issue resolution, and risk-benefit assessment, and because experienced personnel had a regular presence on the construction site and worked collaboratively. The effective QMS was deemed to be integral to the success of the construction project. 1 tab., 7 figs.

  5. Qu'Appelle River Dam, dam break analysis using advanced GIS tools for rapid modelling and inundation mapping

    Energy Technology Data Exchange (ETDEWEB)

    Bonin, D. [Hatch Energy, Winnipeg, MB (Canada); Campbell, C. [Saskatchewan Watershed Authority, Moose Jaw, SK (Canada); Groeneveld, J. [Hatch Energy, Calgary, AB (Canada)

    2008-07-01

    The South Saskatchewan River Project (SSRP) comprises a multi-purpose reservoir that provides water for conservation and irrigation, flood control, power generation, recreation, and municipal and industrial water supply. In addition to the 64 m high Gardiner Dam, the 27 m high Qu'Appelle River Dam and the 22 km long Lake Diefenbaker Reservoir, the SSRP also includes ancillary works. The Qu'Appelle River valley extends for 458 km before connecting to the Assiniboine River. The valley is incised up to 90 m in depth and is a popular cottaging and recreational area with several major communities located in the flood plain. In the event of a breach of the Qu'Appelle Dam, the discharge will increase from a normal maximum discharge of under 60 m{sup 3} per second to over 50,000 m{sup 3} per second. The Saskatchewan Watershed Authority (SWA) is responsible for ensuring safe development of the Province's water resources, without affecting reservoir or lake operations, and preventing damage from flooding, erosion or land slides. It is in the process of developing Hazard Assessments and emergency preparedness plans for each of their dams in accordance with the Canadian Dam Safety Guidelines. Studies using GIS technology and the hydrodynamic routing model HEC-RAS have been completed to evaluate the potential inundation that may result in the event of failure of the Qu'Appelle River Dam. These studies involved the development of a breach parameter model using a breach data set revised to better reflect the Qu'Appelle River Dam; the development of a dam break model for the Qu'Appelle River Dam and downstream river and flood plain; and, the use of this model to simulate two potential dam failure scenarios for the Qu'Appelle River Dam, notably failure during passage of the PMF and failure during fair weather conditions. Inundation maps have been prepared for the downstream Qu'Appelle River valley for each of the above events. 3 refs., 4

  6. 5. decennial inspection of Tignes dam. Draining of the higher french dam; 5. inspection decennale du barrage de Tignes. Vidange du plus haut barrage de France

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-03-01

    This document deals with the 5. decennial inspection of the Tignes dam. The Tignes dam has been drained to allow EDF and the public authorities to verify the dam wall, of 180 m high, in order to validate the next decade. The four steps of the drainage are described as the maintenance policy of such building. (A.L.B.)

  7. Temporary Restoration of Bull Trout Passage at Albeni Falls Dam

    Energy Technology Data Exchange (ETDEWEB)

    Paluch, Mark; Scholz, Allan; McLellan, Holly [Eastern Washington University Department of Biology; Olson, Jason [Kalispel Tribe of Indians Natural Resources Department

    2009-07-13

    This study was designed to monitor movements of bull trout that were provided passage above Albeni Falls Dam, Pend Oreille River. Electrofishing and angling were used to collect bull trout below the dam. Tissue samples were collected from each bull trout and sent to the U. S. Fish and Wildlife Service Abernathy Fish Technology Center Conservation Genetics Lab, Washington. The DNA extracted from tissue samples were compared to a catalog of bull trout population DNA from the Priest River drainage, Lake Pend Oreille tributaries, and the Clark Fork drainage to determine the most probable tributary of origin. A combined acoustic radio or radio tag was implanted in each fish prior to being transported and released above the dam. Bull trout relocated above the dam were able to volitionally migrate into their natal tributary, drop back downstream, or migrate upstream to the next dam. A combination of stationary radio receiving stations and tracking via aircraft, boat, and vehicle were used to monitor the movement of tagged fish to determine if the spawning tributary it selected matched the tributary assigned from the genetic analysis. Seven bull trout were captured during electrofishing surveys in 2008. Of these seven, four were tagged and relocated above the dam. Two were tagged and left below the dam as part of a study monitoring movements below the dam. One was immature and too small at the time of capture to implant a tracking tag. All four fish released above the dam passed by stationary receivers stations leading into Lake Pend Oreille and no fish dropped back below the dam. One of the radio tags was recovered in the tributary corresponding with the results of the genetic test. Another fish was located in the vicinity of its assigned tributary, which was impassable due to low water discharge at its mouth. Two fish have not been located since entering the lake. Of these fish, one was immature and not expected to enter its natal tributary in the fall of 2008. The other

  8. Environmental Assessment, Repair of the Dam at Non-Potable Reservoir #1, United States Air Force Academy, Colorado

    Science.gov (United States)

    2015-08-01

    compound WWTP wastewater treatment plant August 2015 Environmental Assessment 1-1 Repair Dam at Non-Potable Reservoir #1, Air Force Academy...pumping approximately 1.5 million gpd during the irrigation season with an additional 0.5 million gpd of effluent from the wastewater treatment plant...environmental justice, utilities, transportation (roadway), Environmental Restoration Program (ERP) sites, storage tanks, pesticide usage, polychlorinated

  9. Physical and biological responses to an alternative removal strategy of a moderate-sized dam in Washington, USA.

    Science.gov (United States)

    Shannon Claeson; B. Coffin

    2015-01-01

    Dam removal is an increasingly practised river restoration technique, and ecological responses vary with watershed, dam and reservoir properties, and removal strategies. Moderate-sized dams, like Hemlock Dam (7.9m tall and 56m wide), are large enough that removal effects could be significant, but small enough that mitigation may be possible through a modified dam...

  10. Histological and Metabolic State of Dams Suckling Small Litter or MSG-Treated Pups

    Directory of Open Access Journals (Sweden)

    Claudia Regina Capriglioni Cancian

    2016-01-01

    Full Text Available Lactation is an important function that is dependent on changes in the maternal homeostasis and sustained by histological maternal adjustments. We evaluated how offspring manipulations during the lactational phase can modulate maternal morphologic aspects in the mammary gland, adipose tissue, and pancreatic islets of lactating dams. Two different models of litter-manipulation-during-lactation were used: litter sizes, small litters (SL or normal litters (NL and subcutaneous injections in the puppies of monosodium glutamate (MSG, or saline (CON. SL Dams and MSG Dams presented an increase in WAT content and higher plasma levels of glucose, triglycerides, and insulin, in relation to NL Dams and CON Dams, respectively. The MG of SL Dams and MSG Dams presented a high adipocyte content and reduced alveoli development and the milk of the SL Dams presented a higher calorie and triglyceride content, compared to that of the NL Dams. SL Dams presented a reduction in islet size and greater lipid droplet accumulation in BAT, in relation to NL Dams. SL Dams and MSG Dams present similar responses to offspring manipulation during lactation, resulting in changes in metabolic parameters. These alterations were associated with higher fat accumulation in BAT and changes in milk composition only in SL Dams.

  11. Influence of spatial variations in ground motion on earthquake response of arch dams

    Energy Technology Data Exchange (ETDEWEB)

    Chopra, A. [California Univ., Berkeley, CA (United States). Dept. of Civil and Environmental Engineering; Wang, J. [Tsinghua Univ., Beijing (China). Dept. of Hydraulic Engineering

    2010-07-01

    Ground motion recorded at arch dams demonstrate spatial variation or non-uniformity along the dam-foundation interface. Records obtained at two dams demonstrated this phenomena, notably the Pacoima Dam located in California during the magnitude 4.3 earthquake on January 13, 2001, and the magnitude 6.9 Northridge earthquake on January 17, 1994; and the Mauvoisin Dam located in Switzerland during the magnitude 4.6 Valpelline earthquake on March 31, 1996. These spatial variations in ground motion are hardly ever considered in earthquake analysis of arch dams. When they are included, dam-water-interaction is generally oversimplified. This paper discussed the use of the linear analysis procedure, which includes dam-water-foundation rock interaction effects and recognizes the semi-unbounded extent of the rock and impounded water domains in examining the response of the two arch dams to spatially-varying ground motions recorded during earthquakes. Specifically, the paper discussed the Mauvoisin Dam and earthquake records; system and excitation; influence of spatial variations in ground motion; Pacoima Dam and earthquake records; and influence of spatial variations in excitation. It was concluded that spatial variations in ground motion, typically ignored in dam engineering practice, can have profound influence on the earthquake-induced stresses in the dam. This influence depends on the degree to which ground motion varies spatially along the dam-rock interface. 11 refs., 9 figs.

  12. The behaviour of a large dam at severe frost

    Directory of Open Access Journals (Sweden)

    M. C. SPADEA

    1972-06-01

    Full Text Available Synthesizing the problem, the action of the thrusts in the
    behaviour of t h e dam of Pieve di Cadore, makes itself conspicuous expecially
    during three periods of the year:
    1. - About the end of June, the air temperature, 011 t h e average, overcomes
    the water one in the watershed upstream the dam: the bending of
    t h e dam upstream increases from the bottom to the top.
    2. - About the end of October, the thermal conditions change; the
    mean air temperature grows lower than the mean water temperature; the
    dam begins her bending dowstream.
    3. - When the air temperature is distinctly below 0 °C, the action of
    t h e t h r u s t s grows more complexe; t h e rocky waterlogged system downstream
    of t h e dam, while cooling, swells and pushes t h e bottom of t h e dam upstream;
    at t h e higher quote, on the contrary, the t h r u s t downstream continues.
    When the strenght limit of the medium is surpassed, arises a contrast
    between the rocky system and the concrete structure: this contrast can origin
    a t e very small fractures, revealed from seismic station installed into the
    central ashlar (XIV a t 660 metres height of t h e dam, under t h e form of microshocks
    which energy is of about 10I0-10U erg.

  13. Mitigation for the Construction and Operation of Libby Dam, 2003-2004 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Dunnigan, James; DeShazer, Jay; Garrow, Larry (Montana Department of Fish, Wildlife and Parks, Libby, MT)

    2004-06-01

    ''Mitigation for the Construction and Operation of Libby Dam'' is part of the Northwest Power and Conservation Council's (NPCC) resident fish and wildlife program. The program was mandated by the Northwest Planning Act of 1980, and is responsible for mitigating for damages to fish and wildlife caused by hydroelectric development in the Columbia River Basin. The objective of Phase I of the project (1983 through 1987) was to maintain or enhance the Libby Reservoir fishery by quantifying seasonal water levels and developing ecologically sound operational guidelines. The objective of Phase II of the project (1988 through 1996) was to determine the biological effects of reservoir operations combined with biotic changes associated with an aging reservoir. The objectives of Phase III of the project (1996 through present) are to implement habitat enhancement measures to mitigate for dam effects, to provide data for implementation of operational strategies that benefit resident fish, monitor reservoir and river conditions, and monitor mitigation projects for effectiveness. This project completes urgent and high priority mitigation actions as directed by the Kootenai Subbasin Plan. Montana FWP uses a combination of diverse techniques to collect a variety of physical and biological data within the Kootenai River Basin. These data serve several purposes including: the development and refinement of models used in management of water resources and operation of Libby Dam; investigations into the limiting factors of native fish populations, gathering basic life history information, tracking trends in endangered, threatened species, and the assessment of restoration or management activities intended to restore native fishes and their habitats.

  14. Mitigation for the Construction and Operation of Libby Dam, 2004-2005 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Dunnigan, James; DeShazer, Jay; Garrow, Larry (Montana Department of Fish, Wildlife and Parks, Libby, MT)

    2005-06-01

    ''Mitigation for the Construction and Operation of Libby Dam'' is part of the Northwest Power and Conservation Council's (NPCC) resident fish and wildlife program. The program was mandated by the Northwest Planning Act of 1980, and is responsible for mitigating damages to fish and wildlife caused by hydroelectric development in the Columbia River Basin. The objective of Phase I of the project (1983 through 1987) was to maintain or enhance the Libby Reservoir fishery by quantifying seasonal water levels and developing ecologically sound operational guidelines. The objective of Phase II of the project (1988 through 1996) was to determine the biological effects of reservoir operations combined with biotic changes associated with an aging reservoir. The objectives of Phase III of the project (1996 through present) are to implement habitat enhancement measures to mitigate for dam effects, to provide data for implementation of operational strategies that benefit resident fish, monitor reservoir and river conditions, and monitor mitigation projects for effectiveness. This project completes urgent and high priority mitigation actions as directed by the Kootenai Subbasin Plan. Montana Fish, Wildlife & Parks (MFWP) uses a combination of techniques to collect physical and biological data within the Kootenai River Basin. These data serve several purposes including: the development and refinement of models used in management of water resources and operation of Libby Dam; investigations into the limiting factors of native fish populations, gathering basic life history information, tracking trends in endangered and threatened species, and the assessment of restoration or management activities designed to restore native fishes and their habitats.

  15. Dams. Bulletin of the technical service of electric power and big dams; Barrages. Bulletin du service technique de l`energie electrique et des grands barrages

    Energy Technology Data Exchange (ETDEWEB)

    Davard, J.

    1997-12-31

    The Dams bulletin reports on technical news concerning big French dams in operation. This issue comprises 5 papers. Two of them are examples of granting problems which led to the dismantling of the dams of Kernansquillec (Cotes d`Armor, France) and Maisons-Rouges (Indre-et-Loire, France) for economical and environmental reasons. The 3 other papers concern the life of French dams (technical control reports of the French dams in operation), the activities of the control service (annual inspections, preparation of draining operations, renewing of granting), and some general information (organisation of competent authorities, colloquium reports, hydro-power production during the first quarter of 1997). (J.S.)

  16. Factors affecting route selection and survival of steelhead kelts at Snake River dams in 2012 and 2013

    Energy Technology Data Exchange (ETDEWEB)

    Harnish, Ryan A. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Colotelo, Alison H. A. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Li, Xinya [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Fu, Tao [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Ham, Kenneth D. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Deng, Zhiqun [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Green, Ethan D. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2015-03-31

    In 2012 and 2013, Pacific Northwest National Laboratory (PNNL) conducted a study that summarized the passage route proportions and route-specific survival rates of steelhead kelts that passed through Federal Columbia River Power System (FCRPS) dams. To accomplish this, a total of 811 steelhead kelts were tagged with Juvenile Salmon Acoustic Telemetry System (JSATS) transmitters. Acoustic receivers, both autonomous and cabled, were deployed throughout the FCRPS to monitor the downstream movements of tagged kelts. Kelts were also tagged with passive integrated transponder tags to monitor passage through juvenile bypass systems (JBS) and detect returning fish. The current study evaluated data collected in 2012 and 2013 to identify environmental, temporal, operational, individual, and behavioral variables that were related to forebay residence time, route of passage, and survival of steelhead kelts at FCRPS dams on the Snake River. Multiple approaches, including 3-D tracking, bivariate and multivariable regression modeling, and decision tree analyses were used to identify the environmental, temporal, operational, individual, and behavioral variables that had the greatest effect on forebay residence time, route of passage, and route-specific and overall dam passage survival probabilities for tagged kelts at Lower Granite (LGR), Little Goose (LGS), and Lower Monumental (LMN) dams. In general, kelt behavior and discharge appeared to work independently to affect forebay residence times. Kelt behavior, primarily approach location, migration depth, and “searching” activities in the forebay, was found to have the greatest influence on their route of passage. The condition of kelts was the single most important factor affecting their survival. The information gathered in this study may be used by dam operators and fisheries managers to identify potential management actions to improve in-river survival of kelts or collection methods for kelt reconditioning programs to aid

  17. Large Dam Effects on Flow Regime and Hydraulic Parameters of river (Case study: Karkheh River, Downstream of Reservoir Dam

    Directory of Open Access Journals (Sweden)

    Farhang Azarang

    2017-06-01

    Full Text Available Introduction: The critical role of the rivers in supplying water for various needs of life has led to engineering identification of the hydraulic regime and flow condition of the rivers. Hydraulic structures such dams have inevitable effects on their downstream that should be well investigated. The reservoir dams are the most important hydraulic structures which are the cause of great changes in river flow conditions. Materials and Methods: In this research, an accurate assessment was performed to study the flow regime of Karkheh river at downstream of Karkheh Reservoir Dam as the largest dam in Middle East. Karkheh River is the third waterful river of Iran after Karun and Dez and the third longest river after the Karun and Sefidrud. The Karkheh Dam is a large reservoir dam built in Iran on the Karkheh River in 2000. The Karkheh Reservoir Dam is on the Karkheh River in the Northwestern Khouzestan Province, the closest city being Andimeshk to the east. The part of Karkheh River, which was studied in this research is located at downstream of Karkheh Reservoir Dam. This interval is approximately 94 km, which is located between PayePol and Abdolkhan hydrometric stations. In this research, 138 cross sections were used along Karkheh River. Distance of cross sections from each other was 680m in average. The efficient model of HEC-RAS has been utilized to simulate the Karkheh flow conditions before and after the reservoir dam construction using of hydrometric stations data included annually and monthly mean discharges, instantaneous maximum discharges, water surface profiles and etc. Three defined discharges had been chosen to simulate the Karkheh River flow; maximum defined discharge, mean defined discharge and minimum defined discharge. For each of these discharges values, HEC-RAS model was implemented as a steady flow of the Karkheh River at river reach of study. Water surface profiles of flow, hydraulic parameters and other results of flow regime in

  18. Enhancing mud supply from the Lower Missouri River to the Mississippi River Delta USA: Dam bypassing and coastal restoration

    Science.gov (United States)

    Kemp, G. Paul; Day, John W.; Rogers, J. David; Giosan, Liviu; Peyronnin, Natalie

    2016-12-01

    Sand transport to the Mississippi River Delta (MRD) remains sufficient to build wetlands in shallow, sheltered coastal bays fed by engineered diversions on the Mississippi River (MR) and its Atchafalaya River (AR) distributary. But suspended mud (silt & clay) flux to the coast has dropped from a mean of 390 Mt y-1 in the early 1950s, to 100 Mt y-1 since 1970. This fine-grained sediment travels deeper into receiving estuarine basins and plays a critical role in sustaining existing marshes. Virtually all of the 300 Mt y-1 of missing mud once flowed from the Missouri River (MOR) Basin before nearly 100 dams were built as part of the Pick-Sloan water development project. About 100 Mt y-1 is now intercepted by main-stem Upper MOR dams closed in 1953. But the remaining 200 Mt y-1 is trapped by impoundments built on tributaries to the Lower MOR in the 1950s and 1960s. Sediment flux during the post-dam high MOR discharge years of 1973, 1993 and 2011 approached pre-dam levels when tributaries to the Lower MOR, including the Platte and Kansas Rivers, contributed to flood flows. West bank tributaries drain a vast, arid part of the Great Plains, while those entering from the east bank traverse the lowlands of the MOR floodplain. Both provinces are dominated by highly erodible loess soils. Staunching the continued decline in MR fine-grained sediment flux has assumed greater importance now that engineered diversions are being built to reconnect the Lowermost MR to the MRD. Tributary dam bypassing in the Lower MOR basin could increase mud supply to the MRD by 100-200 Mt y-1 within 1-2 decades. Such emergency measures to save the MRD are compatible with objectives of the Missouri River Restoration and Platte River Recovery Programs to restore MOR riparian habitat for endangered species. Rapid mobilization to shunt fine-grained sediments past as many as 50 Lower MOR tributary dams in several U.S. states will undoubtedly require as much regional coordination and funding in the 21st

  19. Putting Roman Dams in Context: a Virtual Approach

    Science.gov (United States)

    Decker, M. J.; Du Vernay, J. P.; Mcleod, J. B.

    2017-08-01

    Water resources and management have become a critical global issue. During the half-millennium of its existence, the Roman Empire developed numerous strategies to cope with water management, from large-scale urban aqueduct systems, to industrial-scale water mills designed to cope with feeding growing city populations. Roman engineers encountered, adopted, and adapted indigenous hydraulic systems, and left lasting imprints on the landscape of the Mediterranean and temperate Western Europe by employing a range of water technologies. A recent academic study has enabled the identification of remains of and references to seventy-two dams from the Roman era, constructed in Spain between the 1st and 4th century AD. Such unique heritage, without comparisons in the Mediterranean makes Spain an emblematic case study for the analysis of Roman hydraulic engineering and water management policies. Fifty dams have been located and detailed. The twenty-two outstanding, although identified on the ground, have not been able to be acceptably characterized, due in some cases to their being ruins in a highly degraded state, others due to their being masked by repairs and reconstructions subsequent to the Roman era. A good example of such neglected dams is the buttress dam of Consuegra , in Toledo province (Castilla-La Mancha). Dating to the 3rd - 4th century AD, the Dam of Consuegra, on the basin of the Guadiana, with its over 600 metres length and 4,80 metres height, is a remarkable case of Roman engineering mastery. It had a retaining wall upstream, numerous buttresses and perhaps an embankment downstream, of which no remains are left. The application of 3D digital imaging technique to create a high quality virtual model of such monuments has proved to be successful especially for the study of the technological aspects related its construction. The case study of the Roman dam of Muel (Zaragoza) has shown, in fact, as best practices in digital archaeology can provide an original and

  20. PUTTING ROMAN DAMS IN CONTEXT: A VIRTUAL APPROACH

    Directory of Open Access Journals (Sweden)

    M. J. Decker

    2017-08-01

    Full Text Available Water resources and management have become a critical global issue. During the half-millennium of its existence, the Roman Empire developed numerous strategies to cope with water management, from large-scale urban aqueduct systems, to industrial-scale water mills designed to cope with feeding growing city populations. Roman engineers encountered, adopted, and adapted indigenous hydraulic systems, and left lasting imprints on the landscape of the Mediterranean and temperate Western Europe by employing a range of water technologies. A recent academic study has enabled the identification of remains of and references to seventy-two dams from the Roman era, constructed in Spain between the 1st and 4th century AD. Such unique heritage, without comparisons in the Mediterranean makes Spain an emblematic case study for the analysis of Roman hydraulic engineering and water management policies. Fifty dams have been located and detailed. The twenty-two outstanding, although identified on the ground, have not been able to be acceptably characterized, due in some cases to their being ruins in a highly degraded state, others due to their being masked by repairs and reconstructions subsequent to the Roman era. A good example of such neglected dams is the buttress dam of Consuegra , in Toledo province (Castilla-La Mancha. Dating to the 3rd - 4th century AD, the Dam of Consuegra, on the basin of the Guadiana, with its over 600 metres length and 4,80 metres height, is a remarkable case of Roman engineering mastery. It had a retaining wall upstream, numerous buttresses and perhaps an embankment downstream, of which no remains are left. The application of 3D digital imaging technique to create a high quality virtual model of such monuments has proved to be successful especially for the study of the technological aspects related its construction. The case study of the Roman dam of Muel (Zaragoza has shown, in fact, as best practices in digital archaeology can provide

  1. Hydroacoustic Evaluation of Juvenile Salmonid Passage at The Dalles Dam Sluiceway, 2005

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Khan, Fenton; Hedgepeth, J; Mueller, Robert P.; Rakowski, Cynthia L.; Richmond, Marshall C.; Serkowski, John A.; Skalski, John R.

    2006-06-01

    The U.S. Army Corps of Engineers Portland District engaged the Pacific Northwest National Laboratory to evaluate fish passage at The Dalles Dam powerhouse in 2005. The goal of the study was to provide information on smolt passage that will inform decisions on long-term measures and operations to enhance sluiceway passage and reduce turbine passage to improve smolt survival at the dam. The study addressed one of the main programs dedicated to improving juvenile salmonid survival at The Dalles Dam: Surface Flow Bypass. The study objectives (see below) were met using a combination of hydroacoustic and hydraulic data. The study incorporated fixed-location hydroacoustic methods across the entire powerhouse, with especially intense sampling using multiple split-beam transducers at all sluiceway portals. We did not sample fish passage at the spillway in 2005. In the sluiceway nearfield, we used an acoustic camera to track fish movements. The fish data were interpreted with hydraulic data from a computational fluid dynamics (CFD) model. Fish passage data were collected in the framework of an “experiment” using a randomized block design (3-day treatments; two treatments) to compare two sluiceway operational configurations: Sluice 2+5 and Sluice 2+19 (six gates open for each configuration). Total project outflow was 76% of the 10-year average for spring and 71% of the 10-year average for summer. Based on these findings, we make the following recommendations: 1) The sluice should be operated 24 h/d from April until November. 2) Open six rather than three sluice gates to take advantage of the maximum hydraulic capacity of the sluiceway. 3) Open the three gates above the western-most operating main turbine unit and the three gates at MU 8 where turbine passage rates are relatively high. 4) Operate the turbine units below open sluice gates as a standard fish operations procedure. 5) Develop hydraulic and entrance enhancements to the sluiceway to tap the potential of The

  2. Sinkhole formation mechanism at Steinaker Dam : the complete story

    Energy Technology Data Exchange (ETDEWEB)

    Dise, K. [United States Dept. of the Interior, Washington, DC (United States). Bureau of Reclamation

    2009-07-01

    This case history summary described an internal erosion event that occurred at a zoned earthfill dam located within the Ashley Creek watershed area of the Uinta Mountain uplift. The incident occurred under static loading. The rocks in the region are heavily fractured with close to moderately spaced joints along the bedding planes. The joints were not grouted during the dam's construction, and the foundation was not treated with dental concrete or slush grouting. The dam's core material consisted of a mixture of clay, silt and sand. A sinkhole area appeared on the downstream face of the dam and was filled. A second sinkhole appeared in 1965. Abutment grouting was performed. A core investigation study in 1992 showed that voids were present in the core. Deep dynamic compaction was used to densify the foundation materials. Voids in the gravel envelope were filled with fine sand. The investigation showed that the sinkholes were formed by seeps travelling through abutment bedrock fractures. The voids were large enough to provide an exit for the fine-grained foundation alluvial materials. It was concluded that grouting the abutment prevented higher velocity seepages that may have eventually initiated a dam breach. 6 figs.

  3. Applying Mechanistic Dam Breach Models to Historic Levee Breaches

    Directory of Open Access Journals (Sweden)

    Risher Paul

    2016-01-01

    Full Text Available Hurricane Katrina elevated levee risk in the US national consciousness, motivating agencies to assess and improve their levee risk assessment methodology. Accurate computation of the flood flow magnitude and timing associated with a levee breach remains one of the most difficult and uncertain components of levee risk analysis. Contemporary methods are largely empirical and approximate, introducing substantial uncertainty to the damage and life loss models. Levee breach progressions are often extrapolated to the final width and breach formation time based on limited experience with past breaches or using regression equations developed from a limited data base of dam failures. Physically based embankment erosion models could improve levee breach modeling. However, while several mechanistic embankment breach models are available, they were developed for dams. Several aspects of the levee breach problem are distinct, departing from dam breach assumptions. This study applies three embankments models developed for dam breach analysis (DL Breach, HR BREACH, and WinDAM C to historic levee breaches with observed (or inferred breach rates, assessing the limitations, and applicability of each model to the levee breach problem.

  4. The Sulphate Effect on Lijiaxia Concrete Dam (China Gallery

    Directory of Open Access Journals (Sweden)

    Xufen Zhu

    2017-01-01

    Full Text Available The concrete degradation is one of the most serious problems for a dam construct during the normal operation, which determines the dam service life. Hence, it is very important to reduce the extent of the dam concrete degradation for the safety of the dam normal operation. Here, Lijiaxia hydroelectric station is taken as an example, and a comprehensive method to assess the sulphate effect on dam gallery is proposed. Eleven samples in total were taken from three difference locations by the drill bore. The microstructural investigations including X-ray fluorescence spectrometry (XRF, X-ray diffraction (XRD, scanning electron microscope (SEM, and energy dispersive spectroscopy (EDS were conducted to assess the sulphate attack and the degradation degree. Meanwhile, the water chemical analysis was applied to reveal the mechanism of concrete degradation. The experimental and analysis results indicate that the concrete degradation degree varies with the location of the samples. The components of the concrete change and the content of SO3 increase dramatically during degradation. Moreover, the mineral facies of the concrete change correspondingly, with the cement paste substituted by the calcite, calcium vitriol, and gypsum. The reinforcement and precaution measures are suggested based on the results of the degradation assessment.

  5. Analysis the dynamic response of earth dam in free vibration and forced by introducing the effect of the interaction dam foundation

    Directory of Open Access Journals (Sweden)

    Malika Boumaiza

    2018-01-01

    Full Text Available The present study concerns the analysis of the dynamic response of earth dam, in free and forced vibration (under the effect of earthquake using the finite element method. The analysis is carried out at the end of dam construction without filling. The behavior of the dam materials and the foundation is linear elastic. In free vibration, to better understand the effect of the dam foundation interaction, we will take into account different site conditions and see their influence on the free vibration characteristics of the dam. In forced vibration, to study the seismic response of the dam, the system is subjected to the acceleration of the Boumerdes earthquake of May 21, 2003 recorded at the station n ° 2 of the dam of Kaddara in the base, with a parametric study taking into account the influence of the main parameters such as the mechanical properties of the soil: rigidity, density.

  6. Mitigation for the Construction and Operation of Libby Dam, 2000 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Hoffman, Greg; Marotz, Brian L.; Dunnigan, James (Montana Department of Fish, Wildlife and Parks, Libby, MT)

    2002-09-01

    ''Mitigation for the Construction and Operation of Libby Dam'' is part of the Northwest Power Planning Council's resident fish and wildlife program. The program was mandated by the Northwest Planning Act of 1980, and is responsible for mitigating for damages to fish and wildlife caused by hydroelectric development in the Columbia River Basin. The objective of Phase I of the project (1983 through 1987) was to maintain or enhance the Libby Reservoir fishery by quantifying seasonal water levels and developing ecologically sound operational guidelines. The objective of Phase II of the project (1988 through 1996) was to determine the biological effects of reservoir operations combined with biotic changes associated with an aging reservoir. The objectives of Phase III of the project (1996 through present) are to implement habitat enhancement measures to mitigate for dam effects, to provide data for implementation of operational strategies that benefit resident fish, monitor reservoir and river conditions, and monitor mitigation projects for effectiveness.

  7. Smolt Passage Behavior and Flow-Net Relationship in the Forebay of John Day Dam, 1984-1985 Final Report of Research.

    Energy Technology Data Exchange (ETDEWEB)

    Giorgi, Albert E.

    1985-12-01

    The migration routes of downstream migrant salmonids in the forebay of John Day Dam were defined and assessed in relation to current velocities and water turbidity and temperature. Forebay current patterns were obtained from current meters at fixed sampling stations, the distribution of outmigrants was determined from purse seine sampling, and migration routes of yearling chinook salmon and steelhead were identified by radio telemetry techniques. All species of emigrating salmonids alter their distribution across the forebay as they approach the dam. Fish abundance was positively correlated with water clarity. There was no evidence to suggest that the migration routes were in response to current patterns in the forebay. Radio telemetry studies demonstrated that a certain segment of yearling chinook salmon approaching the dam are predisposed to spill passage (Washington side of the river) by virtue of their lateral position across the forebay. A new application of radio tag methodology was assessed and found to be useful in evaluating the effectiveness of spill for bypassing outmigrant salmon. A program system and cartographic model was developed which displays for any specified hour forebay current patterns at prevailing river flows and dam operations. The system can be used at other dam sites where investigations may wish to detail forebay current patterns.

  8. An Evaluation of the Success Rate of Sermo Dam Management in Daerah Istimewa Yogyakarta

    Science.gov (United States)

    Andriawan, A.; Sobriyah; Ikhsan, C.

    2017-11-01

    In dam operating and maintaining activities, there are some activities becoming the main function: the assessment of dam condition to keep monitoring and safeguarding the condition of dam as the main building. To achieve the maximum service, the maximal dam management is required as well and it should be followed with management evaluation. This case study was taken place in Sermo Dam of Daerah Istimewa Yogyakarta during 2015 - 2017. The method applied in this study was descriptive quantitative one, conducting a research using primary and secondary data. In this research, the assessment of dam condition was viewed from 1 (one) component, dam body, so that the component weight was 100%. The value of dam body condition was obtained from data of Sermo Dam monitoring in 2015-2016 and from the result of field survey in 2017. The result of research showed that the condition values of Sermo Dam with dam body component were 92.66% in 2015, 92.99% in 2016, and 93.99% in 2017. The result also showed that the value of dam body condition tended to increase during 2015-2017. To maintain the condition, the maximal operation and maintenance of dam was recommended.

  9. Modeling the costs and benefits of dam construction from a multidisciplinary perspective.

    Science.gov (United States)

    Brown, Philip H; Tullos, Desiree; Tilt, Bryan; Magee, Darrin; Wolf, Aaron T

    2009-07-01

    Although the benefits of dam construction are numerous, particularly in the context of climate change and growing global demand for electricity, recent experience has shown that many dams have serious negative environmental, human, and political consequences. Despite an extensive literature documenting the benefits and costs of dams from a single disciplinary perspective, few studies have simultaneously evaluated the distribution of biophysical, socio-economic, and geopolitical implications of dams. To meet the simultaneous demands for water, energy, and environmental protection well into the future, a broader view of dams is needed. We thus propose a new tool for evaluating the relative costs and benefits of dam construction based on multi-objective planning techniques. The Integrative Dam Assessment Modeling (IDAM) tool is designed to integrate biophysical, socio-economic, and geopolitical perspectives into a single cost/benefit analysis of dam construction. Each of 27 different impacts of dam construction is evaluated both objectively (e.g., flood protection, as measured by RYI years) and subjectively (i.e., the valuation of said flood protection) by a team of decision-makers. By providing a visual representation of the various costs and benefits associated with two or more dams, the IDAM tool allows decision-makers to evaluate alternatives and to articulate priorities associated with a dam project, making the decision process about dams more informed and more transparent. For all of these reasons, we believe that the IDAM tool represents an important evolutionary step in dam evaluation.

  10. Lost in Development’s Shadow: The Downstream Human Consequences of Dams

    Directory of Open Access Journals (Sweden)

    Brian D. Richter

    2010-06-01

    Full Text Available The World Commission on Dams (WCD report documented a number of social and environmental problems observed in dam development projects. The WCD gave particular emphasis to the challenges of properly resettling populations physically displaced by dams, and estimated the total number of people directly displaced at 40-80 million. Less attention has been given, however, to populations living downstream of dams whose livelihoods have been affected by dam-induced alterations of river flows. By substantially changing natural flow patterns and blocking movements of fish and other animals, large dams can severely disrupt natural riverine production systems – especially fisheries, flood-recession agriculture and dry-season grazing. We offer here the first global estimate of the number of river-dependent people potentially affected by dam-induced changes in river flows and other ecosystem conditions. Our conservative estimate of 472 million river-dependent people living downstream of large dams along impacted river reaches lends urgency to the need for more comprehensive assessments of dam costs and benefits, as well as to the social inequities between dam beneficiaries and those potentially disadvantaged by dam projects. We conclude with three key steps in dam development processes that could substantially alleviate the damaging downstream impacts of dams.

  11. Analysis of dam break waves; Analyse av dambruddsboelger

    Energy Technology Data Exchange (ETDEWEB)

    Midttoemme, Grethe Holm (ed.)

    2010-06-15

    The project objective was to improve knowledge and methodology for dam break wave calculations in relation to current practice and NVE's current requirements. The reason was the experience of flood in Troendelag in 2006, which indicated that NVE's policies was not good enough for small and / or erosion prone rivers. The project has shown that erosion processes can be at least as large consequences as the dam break flood, and that degree of detail with respect to terrain data and the choice of roughness is important for the results in a watercourse as Lauvsnes waterway. It is also shown that the results from the use of 2D model may differ significantly from results from the 1D model. The report is making recommendations for updating guidelines for dam break wave calculations. (AG)

  12. Simulation of Soil Moisture Development in Flood Protecting Earth Dams

    Science.gov (United States)

    Cislerova, M.; Zumr, D.; Dusek, J.; Vogel, T.

    2007-12-01

    Extreme floods represent an increased risk for urban areas and agriculture. Time to time the protective earth dams are destroyed by a suddenly increased amount of water with destroing or even cathastrophic consequences. A numerical study of the soil moisture development within the earth body during the flood is simulated under a selection of boundary conditions. Several soil materials are considered. Simulations are performed firstly for homogeneous materials using the 2D single domain approach, in the second step the dual permeability simulations are done assuming inhomogeneities in the construction which may lead to the preferential flow. Results for saturated as well as for unsaturated part of the dam are analyzed. Using the appropriate simulation model may help to design safer flood dams and evaluate the reason of possible failures to prevent future disasters. The research has been performed in the frame of research project VZ 04 CEZ MSM 6840770005.

  13. Valorization of mud from Fergoug dam in manufacturing mortars

    Directory of Open Access Journals (Sweden)

    L. Laoufi

    2016-12-01

    Full Text Available The production of calcined mud, with pozzolanic properties, from the large quantities of sediments dredged from Algerian dams, could be a good opportunity for the formulation of high performance mortars and pozzolanic concretes, with lower costs and less greenhouse gas (CO2 emissions. The optimal temperatures selected for calcination were 750, 850 and 950 °C. The burning operation was continuous over a period of 3 h. Therefore, a series of physical, chemical, mechanical and microstructural analyses were conducted on sediment samples, collected from the waters of Fergoug dam. The results obtained from the analyses of the calcined mud, from the dam, allowed saying that mortars with different percentages of that mud represent a potential source of high reactivity pozzolanic materials.

  14. Impact of dam-building on marine life

    Science.gov (United States)

    Pandian, T. J.

    1980-03-01

    Dam-building across naturally flowing rivers tends to decrease discharge of surplus water into the sea, reduce nutrient concentration in estuaries and coastal waters, and diminish plankton blooms as well as fish landings. Depletion of nutrients and organic matter along with reduced mud and silt deposition affect benthic life on the continental shelf. Reduced mud and silt deposition leads to coastal retreat. Dams, especially those constructed for hydro-electric purposes, hinder migration of fishes and decapods. Discharge from dams can create barriers at high or low flows, cause delays, disrupt normal behavioural routine and change the travel speed of migratory animals. Where all spawners of a given population are frequently kept away from the breeding site, the population faces extinction.

  15. Sediment trapping by dams creates methane emission hot spots

    DEFF Research Database (Denmark)

    Maeck, A.; Delsontro, T.; McGinnis, Daniel F.

    2013-01-01

    Inland waters transport and transform substantial amounts of carbon and account for similar to 18% of global methane emissions. Large reservoirs with higher areal methane release rates than natural waters contribute significantly to freshwater emissions. However, there are millions of small dams...... worldwide that receive and trap high loads of organic carbon and can therefore potentially emit significant amounts of methane to the atmosphere. We evaluated the effect of damming on methane emissions in a central European impounded river. Direct comparison of riverine and reservoir reaches, where...... reservoirs or rivers. We show that sediment accumulation correlates with methane production and subsequent ebullitive release rates and may therefore be an excellent proxy for estimating methane emissions from small reservoirs. Our results suggest that sedimentation-driven methane emissions from dammed river...

  16. A two-dimensional dam-break flood plain model

    Science.gov (United States)

    Hromadka, T.V.; Berenbrock, C.E.; Freckleton, J.R.; Guymon, G.L.

    1985-01-01

    A simple two-dimensional dam-break model is developed for flood plain study purposes. Both a finite difference grid and an irregular triangle element integrated finite difference formulation are presented. The governing flow equations are approximately solved as a diffusion model coupled to the equation of continuity. Application of the model to a hypothetical dam-break study indicates that the approach can be used to predict a two-dimensional dam-break flood plain over a broad, flat plain more accurately than a one-dimensional model, especially when the flow can break-out of the main channel and then return to the channel at other downstream reaches. ?? 1985.

  17. Water quality assessment at Omerli Dam using remote sensing techniques.

    Science.gov (United States)

    Alparslan, Erhan; Aydöner, Cihangir; Tufekci, Vildan; Tüfekci, Hüseyin

    2007-12-01

    Water quality at Omerli Dam, which is a vital potable water resource of Istanbul City, Turkey was assessed using the first four bands of Landsat 7-ETM satellite data, acquired in May 2001 and water quality parameters, such as chlorophyll-a, suspended solid matter, secchi disk and total phosphate measured at several measurement stations at Omerli Dam during satellite image acquisition time and archived at the Marine Pollution and Ecotoxicology laboratory of the Marmara Research Center, where this study was carried out. Establishing a relationship between this data, and the pixel reflectance values in the satellite image, chlorophyll-a, suspended solid matter, secchi disk and total phosphate maps were produced for the Omerli Dam.

  18. Social Discounting of Large Dams with Climate Change Uncertainty

    Directory of Open Access Journals (Sweden)

    Marc Jeuland

    2010-06-01

    This paper reviews the recent discounting controversy and examines its implications for the appraisal of an illustrative hydropower project in Ethiopia. The analysis uses an integrated hydro-economic model that accounts for how the dam’s transboundary impacts vary with climate change. The real value of the dam is found to be highly sensitive to assumptions about future economic growth. The argument for investment is weakest under conditions of robust global economic growth, particularly if these coincide with unfavourable hydrological or development factors related to the project. If however long-term growth is reduced, the value of the dam tends to increase. There may also be distributional or local arguments favouring investment, if growth in the investment region lags behind that of the rest of the globe. In such circumstances, a large dam can be seen as a form of insurance that protects future vulnerable generations against the possibility of macroeconomic instability or climate shocks.

  19. Development of probabilistic operating rules for Hluhluwe Dam, South Africa

    Science.gov (United States)

    Ndiritu, J.; Odiyo, J.; Makungo, R.; Mwaka, B.; Mthethwa, N.; Ntuli, C.; Andanje, A.

    2017-08-01

    Hluhluwe Dam, with a 30 million m3 reservoir that supplies water for irrigation and Hluhluwe municipality in Kwa-Zulu Natal Province, South Africa, was consistently experiencing low storage levels over several non-drought years since 2001. The dam was operated by rules of thumb and there were no records of water releases for irrigation - the main user of the dam. This paper describes an assessment of the historic behaviour of the reservoir since its completion in 1964 and the development of operating rules that accounted for: i) the multiple and different levels of reliability at which municipal and irrigation demands need to be supplied, and ii) inter-annual and inter-decadal variability of climate and inflows into the dam. The assessment of the behaviour of the reservoir was done by simulation assuming trigonometric rule curves that were optimized to maximize both yield and storage state using the SCE-UA method. The resulting reservoir behaviour matched the observed historic trajectory reasonably well and indicated that the dam has mainly been operated at a demand of 10 million m3/year until 2000 when the demand suddenly rose to 25 million m3/year. Operating rules were developed from a statistical analysis of the base yields from 500 simulations of the reservoir each using 5 year-long stochastically generated sequences of inflows, rainfall and evaporation. After the implementation of the operating rules in 2009, the storage state of the dam improved and matched those of other reservoirs in the region that had established operating rules.

  20. Environmental risk assessment of a dam during construction phase

    Directory of Open Access Journals (Sweden)

    S. Rezaian

    2016-12-01

    Full Text Available The present study was conducted to assess the possible risks induced by construction of Gavi Dam in Ilam Province; western part of Iran, using MIKE-11 model and technique for order of preference by similarity to ideal solution. For this purpose, vulnerable zone of the dam site against the flooding risk of Gavi River was calculated for different return periods. The flooding zones were stimulated by MIKE-11 model. In order to check whether or not the dam construction could affect the quality of the Gavi River, the physicochemical quality of the river water was also tested. Afterwards, a questionnaire was prepared containing an inventory of possible risks supposed to be induced by construction of Gavi Dam. The questionnaires were placed at disposal of experts to score the items based on their importance. The questionnaires were then analyzed using SPSS Software, version 16. According to which, a total number of 12 risk factors were identified. The dam construction risks were qualitatively assessed by preliminary hazard analysis. Based on the results, 3 of 12 identified risks were recognized unacceptable. The shortlisted risks were prioritized at final step using technique for order of preference by similarity to ideal solution. "Habitat fragmentation" with a weight of 0.3002, "water pollution" with a weight of 0.295, and "impacts on aquatics" with a weight of 0.293 were identified as three top priority flooding risks. Among the most important corrective measures for mitigation of the risks at construction phase can be pointed to "restoration of the land cover", “conservation of areas surrounding the dam as a new wildlife habitat", “prevention of water contamination”, and "conservation of fish spawning sites".

  1. Satellite SAR interferometry for monitoring dam deformation in Portugal

    OpenAIRE

    Joaquim, Sousa; Lazecky, Milan; Hlavacova, Ivana; Bakon, Matus; Patrício, Glória

    2016-01-01

    The paper offers three examples of satellite SAR interferometry (InSAR) application for monitoring dam deformations: Paradela, Raiva and Alto Ceira, all of them in Portugal. Dam deformations were estimated using several sets of ERS and Envisat C-band SAR data by PS-InSAR method that offers accuracy of a millimeter per year at monitoring man-made tructures. The results show potential of InSAR but also summarize limits of C-band InSAR in these particular cases and can be handful to recogn...

  2. Dispersive Dam-Break Flow of a Photon Fluid

    Science.gov (United States)

    Xu, Gang; Conforti, Matteo; Kudlinski, Alexandre; Mussot, Arnaud; Trillo, Stefano

    2017-06-01

    We investigate the temporal photonic analogue of the dam-break phenomenon for shallow water by exploiting a fiber optics setup. We clearly observe the decay of the steplike input (photonic dam) into a pair of oppositely propagating rarefaction wave and dispersive shock wave. Our results show evidence for a critical transition of the dispersive shock into a self-cavitating state. The detailed observation of the cavitating state dynamics allows for a fully quantitative test of the Whitham modulation theory applied to the universal defocusing nonlinear Schrödinger equation.

  3. Roles for Dam methylation in bacterial chromosome replication

    DEFF Research Database (Denmark)

    Charbon, Godefroid; Koch, Birgit; Skovgaard, Ole

    GATC sequences in the DNA of Escherichia coli and related species are methylated at the adenine residue by DNA adenine methyltransferase (DamMT). These methylated residues and/or the level of DamMT influence initiation of chromosome replication from the replication origin, oriC, which contain...... holoenzyme and the Hda protein. Overall these processes contribute to limit chromosome replication to once and only once per cell cycle. Cells deficient in RIDA (by deletion of the hda gene) overinitiate chromosome replication, grows poorly and rapidly accumulate secondary mutations. We analyzed a number...

  4. The Dalles Dam, Columbia River: Spillway Improvement CFD Study

    Energy Technology Data Exchange (ETDEWEB)

    Cook, Chris B.; Richmond, Marshall C.; Serkowski, John A.

    2006-06-01

    This report documents development of computational fluid dynamics (CFD) models that were applied to The Dalles spillway for the US Army Corps of Engineers, Portland District. The models have been successfully validated against physical models and prototype data, and are suitable to support biological research and operations management. The CFD models have been proven to provide reliable information in the turbulent high-velocity flow field downstream of the spillway face that is typically difficult to monitor in the prototype. In addition, CFD data provides hydraulic information throughout the solution domain that can be easily extracted from archived simulations for later use if necessary. This project is part of an ongoing program at the Portland District to improve spillway survival conditions for juvenile salmon at The Dalles. Biological data collected at The Dalles spillway have shown that for the original spillway configuration juvenile salmon passage survival is lower than desired. Therefore, the Portland District is seeking to identify operational and/or structural changes that might be implemented to improve fish passage survival. Pacific Northwest National Laboratory (PNNL) went through a sequence of steps to develop a CFD model of The Dalles spillway and tailrace. The first step was to identify a preferred CFD modeling package. In the case of The Dalles spillway, Flow-3D was as selected because of its ability to simulate the turbulent free-surface flows that occur downstream of each spilling bay. The second step in development of The Dalles CFD model was to assemble bathymetric datasets and structural drawings sufficient to describe the dam (powerhouse, non-overflow dam, spillway, fish ladder entrances, etc.) and tailrace. These datasets are documented in this report as are various 3-D graphical representations of The Dalles spillway and tailrace. The performance of the CFD model was then validated for several cases as the third step. The validated model

  5. Prediction of downstream geomorphological changes after dam construction: A stream power approach

    DEFF Research Database (Denmark)

    Brandt, Anders

    2000-01-01

    physical geography, hydrology, reservoirs, sediment transport, erosion, sedimentation, fluvial geomorphology, dams, river channel geometry......physical geography, hydrology, reservoirs, sediment transport, erosion, sedimentation, fluvial geomorphology, dams, river channel geometry...

  6. In Situ Geophysical Investigation to Evaluate Dynamic Soil Properties at Success Dam, California

    National Research Council Canada - National Science Library

    Liopis, Jose

    1997-01-01

    ...) velocities of the dam and foundation. The S-wave values are used in conjunction with conventional field and laboratory soil testing methods to provide soil property values for an earthquake analysis of the dam and foundation...

  7. Global Reservoir and Dam Database, Version 1 (GRanDv1): Reservoirs, Revision 01

    Data.gov (United States)

    National Aeronautics and Space Administration — The Global Reservoir and Dam (GRanD) Database, Version 1.1 contains 6,862 records of reservoirs and their associated dams with a cumulative storage capacity of 6,197...

  8. EnviroAtlas - National Inventory of Dams for the Conterminous United States

    Data.gov (United States)

    U.S. Environmental Protection Agency — This EnviroAtlas dataset is a summary of the National Dams Inventory data from 2009 survey. The file contains counts of inventoried dams by 12-digit hydrologic units...

  9. Global Reservoir and Dam Database, Version 1 (GRanDv1): Reservoirs, Revision 01

    Data.gov (United States)

    National Aeronautics and Space Administration — The Global Reservoir and Dam Database, Version 1, Revision 01 (v1.01) contains 6,862 records of reservoirs and their associated dams with a cumulative storage...

  10. Mitigation for the Construction and Operation of Libby Dam, 2001-2002 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Dunnigan, James L.; Marotz, Brian L.; DeShazer, Jay (Montana Department of Fish, Wildlife and Parks, Libby, MT)

    2003-06-01

    Libby Reservoir was created under an International Columbia River Treaty between the United States and Canada for cooperative water development of the Columbia River Basin (Columbia River Treaty 1964). Libby Reservoir inundated 109 stream miles of the mainstem Kootenai River in the United States and Canada, and 40 miles of tributary streams in the U.S. that provided habitat for spawning, juvenile rearing, and migratory passage (Figure 1). The authorized purpose of the dam is to provide power (91.5%), flood control (8.3%), and navigation and other benefits (0.2%; Storm et al. 1982). The Pacific Northwest Power Act of 1980 recognized possible conflicts stemming from hydroelectric projects in the northwest and directed Bonneville Power Administration to ''protect, mitigate, and enhance fish and wildlife to the extent affected by the development and operation of any hydroelectric project of the Columbia River and its tributaries...'' (4(h)(10)(A)). Under the Act, the Northwest Power Planning Council was created and recommendations for a comprehensive fish and wildlife program were solicited from the region's federal, state, and tribal fish and wildlife agencies. Among Montana's recommendations was the proposal that research be initiated to quantify acceptable seasonal minimum pool elevations to maintain or enhance the existing fisheries (Graham et al. 1982). Research to determine how operations of Libby Dam affect the reservoir and river fishery and to suggest ways to lessen these effects began in May, 1983. The framework for the Libby Reservoir Model (LRMOD) was completed in 1989. Development of Integrated Rule Curves (IRCs) for Libby Dam operation was completed in 1996 (Marotz et al. 1996). The Libby Reservoir Model and the IRCs continue to be refined (Marotz et al 1999). Initiation of mitigation projects such as lake rehabilitation and stream restoration began in 1996. The primary focus of the Libby Mitigation project now is to

  11. Large dams and alluvial rivers in the Anthropocene: The impacts of the Garrison and Oahe Dams on the Upper Missouri River

    Science.gov (United States)

    Skalak, Katherine; Benthem, Adam J.; Schenk, Edward R.; Hupp, Cliff R.; Galloway, Joel M.; Nustad, Rochelle A.; Wiche, Gregg J.

    2013-01-01

    The Missouri River has had a long history of anthropogenic modification with considerable impacts on river and riparian ecology, form, and function. During the 20th century, several large dam-building efforts in the basin served the needs for irrigation, flood control, navigation, and the generation of hydroelectric power. The managed flow provided a range of uses, including recreation, fisheries, and habitat. Fifteen dams impound the main stem of the river, with hundreds more on tributaries. Though the effects of dams and reservoirs are well-documented, their impacts have been studied individually, with relatively little attention paid to their interaction along a river corridor. We examine the morphological and sedimentological changes in the Upper Missouri River between the Garrison Dam in ND (operational in 1953) and Oahe Dam in SD (operational in 1959). Through historical aerial photography, stream gage data, and cross sectional surveys, we demonstrate that the influence of the upstream dam is still a major control of river dynamics when the backwater effects of the downstream reservoir begin. In the “Anthropocene”, dams are ubiquitous on large rivers and often occur in series, similar to the Garrison Dam Segment. We propose a conceptual model of how interacting dams might affect river geomorphology, resulting in distinct and recognizable morphologic sequences that we term “Inter-Dam sequence” characteristic of major rivers in the US.

  12. Seismic Fortification Analysis of the Guoduo Gravity Dam in Tibet, China

    OpenAIRE

    Peng Lin; Wenwei Zheng; Bo Huang; Haichao Zhang

    2015-01-01

    The primary aim of this research was to analyze the seismic performance of the Guoduo gravity dam. A nonlinear FEM method was implemented to study the deformation, stress, and overall stability of dam under both static and dynamic loading conditions, including both normal and overloading conditions. A dam seismic failure risk control method is proposed based on the cracking mechanism induced by the dynamic load to ensure dam safety and stability. Numerical simulation revealed that (1) under n...

  13. Susceptibility Zonation of Earthquake induced Landslide-dams at the Catchment of Tongkou River, China

    OpenAIRE

    Fan, Yanan; Chen, Guangqi; Kasama, Kiyonobu; Li, Yange

    2013-01-01

    Significant hazards may occur due to large landslide-dams formed by earthquake induced landslides. Those landslide-dams present serious threats to both life and property from possible upstream flooding when the impounded lake water level rises, and possible dam failure and downstream flooding with rapid release of impounded water. In order to prevent those secondary disasters, we made an assumption that the landslide-dams are only formed when a large amount of landslide deposits directly rush...

  14. Compliance Monitoring of Subyearling Chinook Salmon Smolt Survival and Passage at Bonneville Dam, Summer 2012

    Energy Technology Data Exchange (ETDEWEB)

    Skalski, J. R.; Townsend, Richard L.; Seaburg, Adam; Ploskey, Gene R.; Weiland, Mark A.; Hughes, James S.; Woodley, Christa M.; Deng, Zhiqun; Carlson, Thomas J.

    2013-05-01

    The purpose of this compliance study was to estimate dam passage survival of subyearling Chinook salmon at Bonneville Dam during summer 2012, as required by the 2008 Federal Columbia River Power System Biological Opinion. The study also estimated smolt passage survival from the forebay 2 km upstream of the dam to the tailrace 1 km below the dam, as well as forebay residence time, tailrace egress, and spill passage efficiency, as required in the 2008 Columbia Basin Fish Accords.

  15. Assessing geomorphic change along the Trinity River downstream from Lewiston Dam, California, 1980-2011

    Science.gov (United States)

    Curtis, Jennifer A.; Wright, Scott A.; Minear, Justin T.; Flint, Lorraine E.

    2015-01-01

    The Trinity River Restoration Program, one of the nation’s largest adaptively managed river restoration programs, requires periodic assessment to determine the effectiveness of management actions in restoring channel dynamics and habitat features. This study documents riparian and channel changes along an intensively managed 65-kilometer reach of the Trinity River in California, downstream from Lewiston Dam. The two primary periods of interest, from 1980 to 2001 and from 2001 to 2011, are separated by a shift in restoration activities mandated by the U.S. Department of the Interior December 2000 Record of Decision. The post-2001 restoration strategy increased managed-flow releases, gravel augmentation, watershed restoration, and mechanical channel rehabilitation.

  16. Geomorphic signature of a dammed Sandy River: The lower Trinity River downstream of Livingston Dam in Texas, USA

    Science.gov (United States)

    Smith, Virginia B.; Mohrig, David

    2017-11-01

    Reservoirs behind dams act as deposition sites for much of the sediment being transported by rivers. As a result, the downstream river flow can be well below the transport capacity for bed-material. This promotes bed erosion and other geomorphic changes over some length of river located immediately downstream from a dam. These adjustments have been characterized for the Trinity River, TX, downstream of Livingston Dam. Field measurements and results from a 1D numerical model define a 50-60 river kilometer segment of river undergoing bed erosion as the transport capacity for bed material is reestablished. Consequences of this erosion include lowering of the channel bed, reduction in the sediment volume of channel bars, coarsening of sediment on bar tops, steepening of channel banks, and reduction in lateral migration rates of river bends. Repeat surveys of the river long profile reveals that 40 yr of dam closure has produced up to seven meters of channel-bottom incision downstream of the dam, transforming an initially linear profile into a convex-up long profile. The model output matches this observed change, providing confidence that calculated estimates for spatial and temporal changes in bed-material sediment flux can be used to explore the long-term signature of dam influence on the geomorphology of a sand-bed channel. Measurements of channel geometry, profile, lateral migration, and grain size of the lower Trinity River with distance downstream define both the trend and expected variability about the trend associated with the disruption to the bed-material load.

  17. 76 FR 54487 - Charter Renewal, Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2011-09-01

    ... Bureau of Reclamation Charter Renewal, Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of... the Glen Canyon Dam Adaptive Management Work Group. The purpose of the Adaptive Management Work Group... of the Glen Canyon Dam Adaptive Management Work Group is in the public interest in connection with...

  18. 78 FR 54482 - Charter Renewal, Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2013-09-04

    ... Bureau of Reclamation Charter Renewal, Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of... the Glen Canyon Dam Adaptive Management Work Group. The purpose of the Adaptive Management Work Group... Canyon Dam Adaptive Management Work Group is in the public interest in connection with the performance of...

  19. Analysis of working behavior of Jinping-I Arch Dam during initial impoundment

    Directory of Open Access Journals (Sweden)

    Shi-yong Wu

    2016-07-01

    Full Text Available To study the stress, deformation, and seepage pressure during the initial impoundment of the Jinping-I Arch Dam, monitoring analysis and numerical calculation were used in a dam behavior analysis that focused on the working behavior of the dam during the late period of the initial impoundment up to the end of November 2014. The numerical calculation was performed based on feedback analysis of the deformation and stress of the arch dam through inversion of the elastic moduli (E of the dam body and foundation, using a three-dimensional finite element model for the linear elastic material of the arch dam. The main monitoring indices presented insignificant changes in the late period of the initial impoundment, and the results of feedback analysis were consistent with monitoring results. Analysis results also show that the deformations of the dam body and dam foundation were within the design range; the dam stress distributions were normal, with values lower than the design control criteria; and the seepage flows through the dam body and dam foundation were lower than the design drainage capacity of the deep-well pump house, demonstrating that the Jinping-I Arch Dam was in good working condition, and the initial impoundment had been successfully completed. The results of the working behavior analysis of the Jinping-I hydropower project during the initial impoundment can provide references for safe operation of similar projects.

  20. 76 FR 20707 - Cle Elum Dam Fish Passage Facilities and Fish Reintroduction Project; Kittitas County, WA

    Science.gov (United States)

    2011-04-13

    ... Bureau of Reclamation Cle Elum Dam Fish Passage Facilities and Fish Reintroduction Project; Kittitas... Environmental Impact Statement (FEIS) for the Cle Elum Dam Fish Passage Facilities and Fish Reintroduction... FEIS on the proposed Cle Elum Dam Fish Passage Facilities and Fish Reintroduction Project. The...

  1. Landscape context and the biophysical response of rivers to dam removal in the United States

    Science.gov (United States)

    Foley, Melissa M.; Magilligan, Francis J.; Torgersen, Christian; Major, Jon J.; Anderson, Chauncey; Connolly, Patrick J.; Wieferich, Daniel; Shafroth, Patrick B.; Evans, James E.; Infante, Dana M.; Craig, Laura

    2017-01-01

    Dams have been a fundamental part of the U.S. national agenda over the past two hundred years. Recently, however, dam removal has emerged as a strategy for addressing aging, obsolete infrastructure and more than 1,100 dams have been removed since the 1970s. However, only 130 of these removals had any ecological or geomorphic assessments, and fewer than half of those included before- and after-removal (BAR) studies. In addition, this growing, but limited collection of dam-removal studies is limited to distinct landscape settings. We conducted a meta-analysis to compare the landscape context of existing and removed dams and assessed the biophysical responses to dam removal for 63 BAR studies. The highest concentration of removed dams was in the Northeast and Upper Midwest, and most have been removed from 3rd and 4th order streams, in low-elevation (based on a limited range of landscape settings, which limits predictive capacity in other environmental settings. Biophysical responses to dam removal varied by landscape cluster, indicating that landscape features are likely to affect biophysical responses to dam removal. However, biophysical data were not equally distributed across variables or clusters, making it difficult to determine which landscape features have the strongest effect on dam-removal response. To address the inconsistencies across dam-removal studies, we provide suggestions for prioritizing and standardizing data collection associated with dam removal activities.

  2. Geotechnical sounding of the UTE-Uruguay dams; La auscultacion geotecnica de las presas de UTE

    Energy Technology Data Exchange (ETDEWEB)

    Patrone Matteo, Julio C.; Rosriguez Pastorino, Sandra; Mandia Bica, Magdalena [Administracion Nacional de Usinas e Transmisiones Electricas (UTE), Montevideo (Uruguay)]. E-mail: gsgh@ute.com.uy

    1998-07-01

    This paper addresses specifically to the soil dams, and soil dikes of the Constitucion Dam, which is presently the most instrumented, considering that the set of inspection routine and instrumentation data, including the interpretation and behaviour evaluation, are the basis for the dam sounding.

  3. Dam impacts on and restoration of an alluvial river-Rio Grande, New Mexico

    Science.gov (United States)

    Gigi Richard; Pierre Julien

    2003-01-01

    The impact of construction of dams and reservoirs on alluvial rivers extends both upstream and downstream of the dam. Downstream of dams, both the water and sediment supplies can be altered leading to adjustments in the river channel geometry and ensuing changes in riparian and aquatic habitats. The wealth of pre and post-regulation data on the Middle Rio Grande, New...

  4. A continous Bayesian network for earth dams' risk assessment: methodology and quantification

    NARCIS (Netherlands)

    Morales-Napoles, O.; Delgado-Hernadez-D.J.; De-Leon-Escobedo, D.; Arteaga-Arcos, J.C.

    2013-01-01

    Dams’ safety is highly important for authorities around the world. The impacts of a dam failure can be enormous. Models for investigating dam safety are required for helping decision-makers to mitigate the possible adverse consequences of flooding. A model for earth dam safety must specify clearly

  5. The Distribution and Flux of Fish in the Forebay of The Dalles Dam in 2003

    Energy Technology Data Exchange (ETDEWEB)

    Faber, Derrek M.; Hanks, Michael E.; Zimmerman, Shon A.; Skalski, John R.; Dillingham, Peter W.

    2005-04-29

    In spring and summer 2003, the Pacific Northwest National Laboratory led a team that conducted mobile and fixed hydroacoustic surveys in the forebay of The Dalles Dam for the U.S. Army Corps of Engineers - Portland District, for the Anadromous Fish Evaluation Program. The surveys provided information on the distribution and movement of smolt-sized fish relative to ambient factors such as flow, bathymetry, or diel cycle in the forebay at The Dalles Dam. This information is intended to provide baseline data for the development of a surface bypass alternative for juvenile salmon at The Dalles Dam. We sampled the forebay of The Dallas Dam one day and night each week for six weeks in the spring and another six weeks in the summer. In general, during the day in the spring, the greatest densities of smolt-sized fish were observed in the thalweg of the main channel from the Washington bank, to the east side of the powerhouse, along the powerhouse, and concentrated in the areas next to the sluiceway. Fish density was lower on the Washington side of the river and west of mid-powerhouse (north spillway side). The spring night distribution was similar, with a few notable differences. The density of fish was high on the east side of the powerhouse and along the face of the powerhouse, and more fish were detected on the north spillway side. The distribution of sub-yearling sized fish in summer followed the same general patterns as spring, except that summer fish had a greater presence on the east side of the powerhouse and on the north spillway side. The vertical distribution of fish was also determined. In spring 80% of fish were above 5.6 m of depth during the day and above 4.7 m in the night. The summer fish were similarly distributed in the day and night with 80% of the fish in the upper 4.5 m and 4.7 m of the water column respectively. In general the smolt-sized fish were distributed deeper in the water column in the center of the channel than near the edges. The net

  6. Health of sharptooth catfish Clarias gariepinus in Pongolapoort Dam ...

    African Journals Online (AJOL)

    A histology-based fish health assessment protocol was used in 2009–2010 to assess the health status of Clarias gariepinus from Pongolapoort Dam, South Africa. Nineteen fish were collected by angling. The histology of liver, kidney, gills and testes or ovaries was semi-quantitatively assessed and compared to that of fish ...

  7. Water quality of Flag Boshielo Dam, Olifants River, South Africa ...

    African Journals Online (AJOL)

    Increasing demands for water, discharge of effluents, and variable rainfall have a negative impact on water quality in the Olifants River. Crocodile and fish mortalities attributed to pansteatitis, in Loskop Dam and downstream in the Kruger National Park (KNP), have highlighted the serious effects these impacts are having on ...

  8. Determination of trophic situation of Sarimsakli Dam Lake (Kayseri ...

    African Journals Online (AJOL)

    PRECIOUS

    2009-11-16

    Nov 16, 2009 ... Accepted 12 October, 2009. In this study, water samples were collected from four different stations in Sarımsaklı Dam Lake from ... total nitrogen, phosphate, total phosphate, oxygen saturation were analysed in Environment Ministry. Reference Laboratory. ... Water pH (WTW portable pH meter), dissolved ...

  9. An example of of a small Design Gravity Dams

    African Journals Online (AJOL)

    1 - Preliminary Design of the Diversion Dam. 4. Safety against Piping. The exit gradient generally provides the most significant criterion design for the factor of safety with respect to piping. where: I _ a H e - it Df. H = hydraulic head loss. Df = Embedment depth of structure. •. (I). For a depressed structure on a permeable base.

  10. Predicting Water Levels at Kainji Dam Using Artificial Neural Networks

    African Journals Online (AJOL)

    Poor electricity generation in Nigeria is a very serious problem. Accurate prediction of water levels in dams is very important in power planning. Effective power planning helps in ensuring steady supply of electric power to consumers. The aim of this study is to develop artificial neural network models for predicting water ...

  11. Occurrence of cyanobacteria genera in the Vaal Dam: implications ...

    African Journals Online (AJOL)

    This would assist in minimising taste and odour events in potable water production. Keywords: Anabaena, cyanobacteria dominance, environmental conditions, Microcystis, Vaal Dam, water treatment. INTRODUCTION. The presence of cyanobacteria genera in raw water abstracted for potable water production has been ...

  12. Occurrence of cyanobacteria genera in the Vaal Dam: implications ...

    African Journals Online (AJOL)

    Cyanobacteria genera have been found to be potentially toxic and capable of producing taste and odour secondary metabolites such as geosmin. Historical data from the Department of Water and Sanitation on percentage composition of cyanobacteria genera in the Vaal Dam, were collected for the 2006, 2007, 2011 and ...

  13. Chemical characteristics and limnology of Loskop Dam on the ...

    African Journals Online (AJOL)

    2012-07-20

    Jul 20, 2012 ... aeruginosa and Ceratium hirundinella, have led to serious concerns about water quality in Loskop Dam, on the Olifants. River, South Africa. ... water body through a number of processes, including absorp- tion and adsorption by ...... and body fat of O. mossambicus (Oberholster et al., 2011). CONCLUSION.

  14. Zoobenthic fauna and seasonal changes of mamasin dam lake ...

    African Journals Online (AJOL)

    STORAGESEVER

    2009-09-15

    Sep 15, 2009 ... Mamasın dam lake is situated at 17 km distance to the east of. Aksaray, which is a central ..... creasing secchi disk visibility (cm), photosynthesis and accumulation of ... (cm) used to determine light permeability was measured.

  15. Sediment trapping by dams creates methane emission hot spots.

    Science.gov (United States)

    Maeck, Andreas; Delsontro, Tonya; McGinnis, Daniel F; Fischer, Helmut; Flury, Sabine; Schmidt, Mark; Fietzek, Peer; Lorke, Andreas

    2013-08-06

    Inland waters transport and transform substantial amounts of carbon and account for ∼18% of global methane emissions. Large reservoirs with higher areal methane release rates than natural waters contribute significantly to freshwater emissions. However, there are millions of small dams worldwide that receive and trap high loads of organic carbon and can therefore potentially emit significant amounts of methane to the atmosphere. We evaluated the effect of damming on methane emissions in a central European impounded river. Direct comparison of riverine and reservoir reaches, where sedimentation in the latter is increased due to trapping by dams, revealed that the reservoir reaches are the major source of methane emissions (∼0.23 mmol CH4 m(-2) d(-1) vs ∼19.7 mmol CH4 m(-2) d(-1), respectively) and that areal emission rates far exceed previous estimates for temperate reservoirs or rivers. We show that sediment accumulation correlates with methane production and subsequent ebullitive release rates and may therefore be an excellent proxy for estimating methane emissions from small reservoirs. Our results suggest that sedimentation-driven methane emissions from dammed river hot spot sites can potentially increase global freshwater emissions by up to 7%.

  16. Dam break flood wave under different reservoir's capacities and ...

    Indian Academy of Sciences (India)

    Farhad Hooshyaripor

    2017-07-14

    Jul 14, 2017 ... physics with many uncertainties involved and the potential to cause many losses of lives and economical losses. A primary source of ... Dams are subject to failure because of a variety of causes: landslides, earthquakes, heavy ...... statistical indices, Root Mean Square Error (RMSE),. Average Error (AE) and ...

  17. Monitoring of external background radiation level in Asa dam ...

    African Journals Online (AJOL)

    An external background ionizing radiation study has been carried out within the Asa Dam Industrial Layout of Ilorin in Kwara State. The study was carried out in 5 stations within the industrial area using two Digilert Nuclear Radiation Monitors. The study has revealed that the external background ionizing radiation is ...

  18. Stress distributions in finite element analysis of concrete gravity dam ...

    African Journals Online (AJOL)

    Gravity dams are solid structures built of mass concrete material; they maintain their stability against the design loads from the geometric shape, the mass, and the strength of the concrete. The model was meshed with an 8-node biquadratic plane strain quadrilateral (CPE8R) elements, using ABAQUS, a finite element ...

  19. Fracture analysis of concrete gravity dam under earthquake induced ...

    African Journals Online (AJOL)

    In this paper, seismic fracture behavior of the concrete gravity dam using finite element (2D) theory has been studied. Bazant model which is non-linear fracture mechanics criteria as a measure of growth and smeared crack was chosen to develop profiles of the crack. Behavior of stress - strain curves of concrete as a ...

  20. 36 Dry Season Phytoplankton Composition Of Ibiekuma Dam ...

    African Journals Online (AJOL)

    `123456789jkl''''#

    To benefit from the algae of lakes, ponds, dam reservoirs and rivers, it is necessary to study the taxonomy of ... reservoirs, lakes, springs and streams have also been reported (Kadiri and Opute, 1989; Olele and Ekelemu ... of water, leaving a higher concentration of salt within a smaller volume of water (Imoobe and. Oboh ...

  1. Uncertainty Instability Risk Analysis of High Concrete Arch Dam Abutments

    Directory of Open Access Journals (Sweden)

    Xin Cao

    2017-01-01

    Full Text Available The uncertainties associated with concrete arch dams rise with the increased height of dams. Given the uncertainties associated with influencing factors, the stability of high arch dam abutments as a fuzzy random event was studied. In addition, given the randomness and fuzziness of calculation parameters as well as the failure criterion, hazard point and hazard surface uncertainty instability risk ratio models were proposed for high arch dam abutments on the basis of credibility theory. The uncertainty instability failure criterion was derived through the analysis of the progressive instability failure process on the basis of Shannon’s entropy theory. The uncertainties associated with influencing factors were quantized by probability or possibility distribution assignments. Gaussian random theory was used to generate random realizations for influence factors with spatial variability. The uncertainty stability analysis method was proposed by combining the finite element analysis and the limit equilibrium method. The instability risk ratio was calculated using the Monte Carlo simulation method and fuzzy random postprocessing. Results corroborate that the modeling approach is sound and that the calculation method is feasible.

  2. Enloe Dam Passage Project, Volume I, 1984 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Fanning, M.L.

    1985-07-01

    This report discusses issues related to the provision of fish passage facilities at Enloe Dam and the introduction of anadromous salmonid fish to the upper Similkameen River basin. The species of fish being considered is a summer run of steelhead trout adapted to the upper Columbia basin. (ACR)

  3. Emergency Planning for Dams: Bibliography and Abstracts of Selected Publications,

    Science.gov (United States)

    1982-01-01

    Engineertng and Technology, Washingto, D. C., June, 1978. SeCURITY CLASSIICATION OF THIS PA@U(UIft bal Eem crA EMERGENCY PLANNING FOR DAMS BIBLIOGRAPHY AND...Infiltration Galleries. of Reclamation. Washington, D.C. 1977. ODewatering Systems. * Corrosion and Incrustation. The manual was prepared as a guide for field

  4. Flooding Caused by the Collapse of the Zeyzoun Dam, Syria

    Science.gov (United States)

    2002-01-01

    On Tuesday the Zeyzoun dam in northern Syria ruptured and collapsed, killing 20 people and leaving thousands more homeless. This false-color image taken on June 5, 2002, (bottom) by the Moderate-resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA's Terra satellite shows the extent of the flooding. Normally, there would be no water present in the center of the image (top, acquired on June 3, 2002). After the dam burst, 71 million cubic meters flowed onto the surrounding landscape and washed over an area of 20,000 acres. Hundreds of homes were destroyed in and around the villages of Zeyzoun, Qastoun, and Ziara, roughly 220 miles (350 kilometers) north of Damascus. Most of the residents fled to higher ground with the help of two helicopters. The Syrians originally constructed the dam to contain the Orontes River and provide a steady flow of water to the surrounding farms, many of which were lost. Rescue workers worry that more bodies may be found as the waters of the dam recede. The Japanese government issued more than $40,000 in aid for the victims, and the Syrian government is petitioning international aid agencies for further assistance. In this false-color image, the ground is sage green and rusty orange, and water is black. Clouds appear pink. Image courtesy Jacques Descloitres, MODIS Land Rapid Response Team at NASA GSFC

  5. Effects of the Ben Franklin Dam on the Hanford Site

    Energy Technology Data Exchange (ETDEWEB)

    Harty, H.

    1979-04-01

    A previous assessment of the effects of a Ben Franklin Dam on the Hanford Site made in 1967 was updated so that the potential adverse effects may be better understood in light of existing operations, current environmental and safety standards, and proposed facilities and operations. The major effects would probably arise from flooding of portions of the site by the reservoir associated with the dam and by the raising of the ground water table under the site. A preliminary analysis of the effects of the dam is presented, and a number of studies are recommended in order to fully evaluate and understand these potential impacts. The following seven tasks are identified and discussed: groundwater - hydrology analysis; soil liquefaction analysis; hydrostatic uplift and soil effects on structures; assessment of the potential for landsliding and sloughing; facility decommissioning; hydrothermal analysis; and, meteorological effects. Four other aspects commented upon in this report are: aquatic ecology, terrestrial ecology, socioeconomic effects, and public interaction. Possible effects on ongoing DOE-sponsored R and D are also noted. To the extent possible, cost estimates are developed for corrective actions which must be taken on the Hanford Site to accommodate the dam. Where this was not possible, appropriate courses of action leading to cost estimates are presented.

  6. 77 FR 22801 - Glen Canyon Dam Adaptive Management Work Group

    Science.gov (United States)

    2012-04-17

    ... Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY: Bureau of Reclamation... AMP includes a Federal advisory committee, the AMWG, a technical work group, a Grand Canyon Monitoring and Research Center, and independent review panels. The technical work group is a subcommittee of the...

  7. Accuracy Analysis of a Dam Model from Drone Surveys

    Science.gov (United States)

    Buffi, Giulia; Venturi, Sara

    2017-01-01

    This paper investigates the accuracy of models obtained by drone surveys. To this end, this work analyzes how the placement of ground control points (GCPs) used to georeference the dense point cloud of a dam affects the resulting three-dimensional (3D) model. Images of a double arch masonry dam upstream face are acquired from drone survey and used to build the 3D model of the dam for vulnerability analysis purposes. However, there still remained the issue of understanding the real impact of a correct GCPs location choice to properly georeference the images and thus, the model. To this end, a high number of GCPs configurations were investigated, building a series of dense point clouds. The accuracy of these resulting dense clouds was estimated comparing the coordinates of check points extracted from the model and their true coordinates measured via traditional topography. The paper aims at providing information about the optimal choice of GCPs placement not only for dams but also for all surveys of high-rise structures. The knowledge a priori of the effect of the GCPs number and location on the model accuracy can increase survey reliability and accuracy and speed up the survey set-up operations. PMID:28771185

  8. Accuracy Analysis of a Dam Model from Drone Surveys.

    Science.gov (United States)

    Ridolfi, Elena; Buffi, Giulia; Venturi, Sara; Manciola, Piergiorgio

    2017-08-03

    This paper investigates the accuracy of models obtained by drone surveys. To this end, this work analyzes how the placement of ground control points (GCPs) used to georeference the dense point cloud of a dam affects the resulting three-dimensional (3D) model. Images of a double arch masonry dam upstream face are acquired from drone survey and used to build the 3D model of the dam for vulnerability analysis purposes. However, there still remained the issue of understanding the real impact of a correct GCPs location choice to properly georeference the images and thus, the model. To this end, a high number of GCPs configurations were investigated, building a series of dense point clouds. The accuracy of these resulting dense clouds was estimated comparing the coordinates of check points extracted from the model and their true coordinates measured via traditional topography. The paper aims at providing information about the optimal choice of GCPs placement not only for dams but also for all surveys of high-rise structures. The knowledge a priori of the effect of the GCPs number and location on the model accuracy can increase survey reliability and accuracy and speed up the survey set-up operations.

  9. Evaluation of the growth performance of calves from different dams ...

    African Journals Online (AJOL)

    The growth performance of seven calves from different Muturu dams served by same bull was studied in a mini cattle ranch. Body measurements were taken and observed for growth over a period of 12 months. The result indicates an apparent difference among the calves in all parameters measured including body weight, ...

  10. Recent blooms of the dinoflagellate Ceratium in Albert Falls Dam ...

    African Journals Online (AJOL)

    Recent blooms of the dinoflagellate Ceratium in Albert Falls Dam (KZN): History, causes, spatial features and impacts on a reservoir ecosystem and its zooplankton. ... Ceratium totally dominated the phytoplankton assemblage, accounting almost completely for coincident chlorophyll levels, which generally increased with ...

  11. Optimization of Hydroacoustic Equipment Deployment at Foster Dam, 2013

    Energy Technology Data Exchange (ETDEWEB)

    Hughes, James S.; Johnson, Gary E.; Ploskey, Gene R.; Hennen, Matthew J.; Fischer, Eric S.; Zimmerman, Shon A.

    2013-03-01

    The goal of the study was to optimize performance of the fixed-location hydroacoustic systems at Foster Dam (FOS) by determining deployment and data acquisition methods that minimized structural, electrical, and acoustic interference. Optimization of the hydroacoustic systems will establish methodology for sampling by active acoustic methods during this year-long evaluation of juvenile salmonid passage at FOS.

  12. Dry Season Phytoplankton Composition Of Ibiekuma Dam, Ekpoma ...

    African Journals Online (AJOL)

    In this study, the phytoplankton composition of Ibiekuma dam, Ekpoma was investigated between January and February, 2010. A total of 20 phytoplankton taxa belonging to three divisions; Bacillariophyta, Chlorophyta and Euglenophyta were observed. All the species of Bacillariophyta observed were pennate forms.

  13. Fracture analysis of concrete gravity dam under earthquake induced ...

    African Journals Online (AJOL)

    Michael Horsfall

    1 Civil Engineering, Islamic Azad University (South Branch of Tehran)Tehran, Iran. 2 Civil Engineering ..... such as concrete dams where the damaged area is relatively big. This method is established on the base of energy relations. In the field of fracture mechanics .... proper criterion and provides us with the real behavior.

  14. 77 FR 50493 - Sam Rayburn Dam Project Power Rate

    Science.gov (United States)

    2012-08-21

    .... Procedures for Public Participation in Power and Transmission Rate Adjustments and Extensions of the Power... transmission facilities, which consist of 1,380 miles of high-voltage transmission lines, 25 substations, and 46 microwave and VHF radio sites. Costs associated ] with the Sam Rayburn and Robert D. Willis Dams...

  15. Liquefaction evaluation of dam foundation soils considering overlying structure

    Directory of Open Access Journals (Sweden)

    Gang Wang

    2015-04-01

    Full Text Available The liquefaction analysis procedure conducted at a dam foundation associated with a layer of liquefiable sand is presented. In this case, the effects of the overlying dam and an embedded diaphragm wall on liquefaction potential of foundation soils are considered. The analysis follows the stress-based approach which compares the earthquake-induced cyclic stresses with the cyclic resistance of the soil, and the cyclic resistance of the sand under complex stress condition is the key issue. Comprehensive laboratory monotonic and cyclic triaxial tests are conducted to evaluate the static characteristics, dynamic characteristics and the cyclic resistance against liquefaction of the foundation soils. The distribution of the factor of safety considering liquefaction is given. It is found that the zones beneath the dam edges and near the upstream of the diaphragm wall are more susceptible to liquefaction than in free field, whereas the zone beneath the center of the dam is less susceptible to liquefaction than in free field. According to the results, the strategies of ground improvement are proposed to mitigate the liquefaction hazards.

  16. Downstream migration and multiple dam passage by Atlantic Salmon smolts

    Science.gov (United States)

    Nyqvist, D.; McCormick, Stephen; Greenberg, L.; Ardren, W.R.; Bergman, E.; Calles, O.; Castro-Santos, Theodore R.

    2017-01-01

    The purpose of this study was to investigate behavior and survival of radio-tagged wild and hatchery-reared landlocked Atlantic Salmon Salmo salar smolts as they migrated past three hydropower dams equipped with fish bypass solutions in the Winooski River, Vermont. Among hatchery-reared smolts, those released early were more likely to initiate migration and did so after less delay than those released late. Once migration was initiated, however, the late-released hatchery smolts migrated at greater speeds. Throughout the river system, hatchery-reared fish performed similarly to wild fish. Dam passage rates varied between the three dams and was highest at the dam where unusually high spill levels occurred throughout the study period. Of the 50 fish that did migrate downstream, only 10% managed to reach the lake. Migration success was low despite the presence of bypass solutions, underscoring the need for evaluations of remedial measures; simply constructing a fishway is not synonymous with providing fish passage.

  17. Three Dimensional Seepage Analyses in Mollasadra Dam after Its ...

    African Journals Online (AJOL)

    Michael Horsfall

    certain piezometers, which represent the hydraulic behavior of the dam, are presented in this paper. These piezometers are shown with black circles on. Figure 1. Various types of instruments such as electrical and stand pipe piezometers, electrical pressure cells, inclinometers, observation wells, settlement gauges.

  18. Accuracy Analysis of a Dam Model from Drone Surveys

    Directory of Open Access Journals (Sweden)

    Elena Ridolfi

    2017-08-01

    Full Text Available This paper investigates the accuracy of models obtained by drone surveys. To this end, this work analyzes how the placement of ground control points (GCPs used to georeference the dense point cloud of a dam affects the resulting three-dimensional (3D model. Images of a double arch masonry dam upstream face are acquired from drone survey and used to build the 3D model of the dam for vulnerability analysis purposes. However, there still remained the issue of understanding the real impact of a correct GCPs location choice to properly georeference the images and thus, the model. To this end, a high number of GCPs configurations were investigated, building a series of dense point clouds. The accuracy of these resulting dense clouds was estimated comparing the coordinates of check points extracted from the model and their true coordinates measured via traditional topography. The paper aims at providing information about the optimal choice of GCPs placement not only for dams but also for all surveys of high-rise structures. The knowledge a priori of the effect of the GCPs number and location on the model accuracy can increase survey reliability and accuracy and speed up the survey set-up operations.

  19. Fish communities of Tagwai dam, Niger state, Nigeria. | Ojutiku ...

    African Journals Online (AJOL)

    ... families and species of Characidae, Cypirinidae, and Clariidae but the family Clupeidae was significantly (p<0.05) different from the rest families. The species Auchanoglanis biscitutus only occurred twice during the three month of sampling making it the least species available. Key words: Fish, communities, Tagwai, Dam ...

  20. Assessment of the Physicochemical Quality of Challawa Gorge Dam ...

    African Journals Online (AJOL)

    Water and sediment samples were collected from Challawa Gorge dam during the wet and dry seasons and analyzed for some physicochemical parameters, heavy metals (Cd, Cr, Mn, Pb, Zn) and minerals (Na and K) using Atomic Absorption Spectrophotometric and Flame Photometric techniques. The results showed the ...

  1. Aspects of limnological studies of Tagwai dam, Minna, Niger state ...

    African Journals Online (AJOL)

    The seasonal variations in the physico-chemical characteristics of Tagwai dam in relation to their potential for fish production were studied for twelve months. Five sampling stations were located on the reservoir. The stations were established based on the major tributaries to the reservoir and importance of site.

  2. Assessment of anomalous seepage conditions in the Opa dam ...

    African Journals Online (AJOL)

    Verdant vegetation on the downstream side of the embankment and location of water ponds at the toe of the embankment around the identified seepage zones are field confirmation of the anomalous seepage. KEY WORDS: Anomalous seepage; Assessment; Opa Dam Embankment. Global Journal of Geological Sciences ...

  3. Novel Method to Assess the Risk of Dam Failure

    Directory of Open Access Journals (Sweden)

    Qinli Yang

    2011-11-01

    Full Text Available A new flexible, rapid and affordable risk assessment procedure was developed and verified for dams based on case studies in Scotland (UK and the region of Baden (Germany. A database of six different sustainable flood retention basin (SFRB types with varying flood control potential has been developed. In Scotland, there are a relatively high number of current and former large drinking water reservoirs which could contribute to flood management control. In comparison, purpose-built and relatively small SFRB, which are predominantly used for flood control, dominate the landscape in Baden. Moreover, 13 out of 149 SFRB have recently been upgraded, and 11 new SFRB have been built since 2006. Both the estimated hazard and risk are small in comparison to those found in the flood infrastructure in Scotland. The study assesses a rapid screening tool developed to estimate the Dam Condition and the corresponding Dam Failure Hazard and Dam Failure Risk. Most SFRB in Baden have a relatively poor Dam Condition, high Dam Failure Hazard but low Dam Failure Risk compared to those in Scotland. Findings show that Baden is more advanced in flood defence management as well as adaptation to climate change.Deutscher Titel: Neue Methode zur Beurteilung des Risikos eines DammbruchesZusammenfassung: Eine neue, flexible, schnelle und preisgünstige Methode zur Risokobeurteilung von Dämmen wurde entwickelt und getestet, die auf Fallbeispielen in Schottland (Vereinigtes Königreich und der Region Baden (Deutschland basiert. Eine Datenbank von sechs verschiedenen Typen nachhaltiger Hochwasserrückhaltebecken (NHRB mit unterschiedlichem Hochwasserrückhaltevermögen wurde entwickelt. Eine relativ hohe Anzahl von gegenwärtigen und ehemaligen großen Trinkwassertalsperren, die zur Hochwasserschutzkontolle verwandt werden könnten, befinden sich in Schottland. Zweckmäßig gebaute und relativ kleine NHRB, die hauptsächlich für den Hochwasserschutz verwendet werden, dominieren

  4. Rubber dam may increase the survival time of dental restorations.

    Science.gov (United States)

    Keys, William; Carson, Susan J

    2017-03-01

    Data sourcesCochrane Oral Health's Trials Register, Cochrane Central Register of Controlled Trials (CENTRAL), Medline, Embase, LILACS, SciELO, Chinese BioMedical Literature Database, VIP, China National Knowledge Infrastructure, ClinicalTrials.gov, World Health Organization International Clinical Trials Registry Platform, OpenGrey and Sciencepaper Online databases. Handsearches in a number of journals.Study selectionRandomised controlled trials, including split-mouth studies assessing the effects of rubber dam isolation for restorative treatments in dental patients.Data extraction and synthesisTwo review authors independently screened the results of the electronic searches, extracted data and assessed the risk of bias of the included studies.ResultsFour studies involving a total of 1,270 patients were included. The studies were at high risk of bias. One trial was excluded from the analysis due to inconsistencies in the presented data. Restorations had a significantly higher survival rate in the rubber dam isolation group compared to the cotton roll isolation group at six months in participants receiving composite restorative treatment of non-carious cervical lesions (risk ratio (RR) 1.19, 95% confidence interval (CI) 1.04 to 1.37, very low-quality evidence). The rubber dam group had a lower risk of failure at two years in children undergoing proximal atraumatic restorative treatment in primary molars (hazard ratio (HR) 0.80, 95% CI 0.66 to 0.97, very low-quality evidence). One trial reported limited data showing that rubber dam usage during fissure sealing might shorten the treatment time. None of the included studies mentioned adverse effects or reported the direct cost of the treatment, or the level of patient acceptance/satisfaction. There was also no evidence evaluating the effects of rubber dam usage on the quality of the restorations.ConclusionsWe found some very low-quality evidence, from single studies, suggesting that rubber dam usage in dental direct

  5. Rubber dam isolation for restorative treatment in dental patients.

    Science.gov (United States)

    Wang, Yan; Li, Chunjie; Yuan, He; Wong, May Cm; Zou, Jing; Shi, Zongdao; Zhou, Xuedong

    2016-09-20

    Successful restorations in dental patients depend largely on the effective control of moisture and microbes during the procedure. The rubber dam technique has been one of the most widely used isolation methods in dental restorative treatments. The evidence on the effects of rubber dam usage on the longevity of dental restorations is conflicting. Therefore, it is important to summarise the available evidence to determine the effects of this method. To assess the effects of rubber dam isolation compared with other types of isolation used for direct and indirect restorative treatments in dental patients. We searched the following electronic databases: Cochrane Oral Health's Trials Register (searched 17 August 2016), Cochrane Central Register of Controlled Trials (CENTRAL; 2016, Issue 7) in the Cochrane Library (searched 17 August 2016), MEDLINE Ovid (1946 to 17 August 2016), Embase Ovid (1980 to 17 August 2016), LILACS BIREME Virtual Health Library (Latin American and Caribbean Health Science Information database; 1982 to 17 August 2016), SciELO BIREME Virtual Health Library (1998 to 17 August 2016), Chinese BioMedical Literature Database (CBM, in Chinese) (1978 to 30 August 2016), VIP (in Chinese) (1989 to 30 August 2016), and China National Knowledge Infrastructure (CNKI, in Chinese) (1994 to 30 August 2016). We searched ClinicalTrials.gov and the World Health Organization International Clinical Trials Registry Platform, OpenGrey and Sciencepaper Online (in Chinese) for ongoing trials. There were no restrictions on the language or date of publication when searching the electronic databases. We included randomised controlled trials (including split-mouth trials) assessing the effects of rubber dam isolation for restorative treatments in dental patients. Two review authors independently screened the results of the electronic searches, extracted data and assessed the risk of bias of the included studies. We resolved disagreement by discussion. We included four studies

  6. Evaluation of the water quality in the releases from thirty dams in the Tennessee River Valley

    Energy Technology Data Exchange (ETDEWEB)

    Butkus, S.R.

    1990-09-01

    The Tennessee Valley Authority (TVA) has routinely monitored dissolved oxygen (DO) and temperature from the tailwater releases of its dams since the 1950s. The original objective of this monitoring was to collect baseline information to support reaeration research and determine the relative impact of impoundments on the assimilative capacity of the river system. This monitoring has continued even though the original objective was satisfied. New purposes for this monitoring data have arisen in support of several programs, without new consideration of the monitoring strategy and sampling design. The primary purpose of this report is to compare the historical release data for 30 dams in the Tennessee Valley based on four different objectives: (1) comparison of seasonal patterns, (2) comparison of baseline conditions using descriptive statistics, (3) evaluation of monotonic trends, and (4) discussion of monitoring strategies that might be required to determine compliance with existing and proposed criteria. A secondary purpose of the report is to compile the existing database into tables and figures that would be useful for other investigators. 51 refs., 210 figs., 1 tab.

  7. State-and-transition prototype model of riparian vegetation downstream of Glen Canyon Dam, Arizona

    Science.gov (United States)

    Ralston, Barbara E.; Starfield, Anthony M.; Black, Ronald S.; Van Lonkhuyzen, Robert A.

    2014-01-01

    Facing an altered riparian plant community dominated by nonnative species, resource managers are increasingly interested in understanding how to manage and promote healthy riparian habitats in which native species dominate. For regulated rivers, managing flows is one tool resource managers consider to achieve these goals. Among many factors that can influence riparian community composition, hydrology is a primary forcing variable. Frame-based models, used successfully in grassland systems, provide an opportunity for stakeholders concerned with riparian systems to evaluate potential riparian vegetation responses to alternative flows. Frame-based, state-and-transition models of riparian vegetation for reattachment bars, separation bars, and the channel margin found on the Colorado River downstream of Glen Canyon Dam were constructed using information from the literature. Frame-based models can be simple spreadsheet models (created in Microsoft® Excel) or developed further with programming languages (for example, C-sharp). The models described here include seven community states and five dam operations that cause transitions between states. Each model divides operations into growing (April–September) and non-growing seasons (October–March) and incorporates upper and lower bar models, using stage elevation as a division. The inputs (operations) can be used by stakeholders to evaluate flows that may promote dynamic riparian vegetation states, or identify those flow options that may promote less desirable states (for example, Tamarisk [Tamarix sp.] temporarily flooded shrubland). This prototype model, although simple, can still elicit discussion about operational options and vegetation response.

  8. Processing sleep data created with the Drosophila Activity Monitoring (DAM) System.

    Science.gov (United States)

    Pfeiffenberger, Cory; Lear, Bridget C; Keegan, Kevin P; Allada, Ravi

    2010-11-01

    Adult behavioral assays have been used with great success in Drosophila melanogaster to identify circadian rhythm genes. In particular, the locomotor activity assay can identify altered behavior patterns over the course of several days in small populations, or even individual flies. Sleep is a highly conserved behavior that is required for optimal performance and, in many cases, life of an organism. Drosophila demonstrate a behavioral state that shows traits consistent with sleep: periods of relative behavioral immobility that coincide with an increased arousal threshold after ~5 min of inactivity, regulated by circadian and homeostatic mechanisms. However, because flies do not produce brain waves recordable by electroencephalography, sleep researchers use behavior-based paradigms to infer when a fly is asleep, as opposed to awake but immobile. Data on Drosophila activity can be collected using an automated monitoring system to provide insight into sleep duration, consolidation, and latency, as well as sleep deprivation and rebound. This protocol details the use of Counting Macro, an Excel-based program, to process data created with the Drosophila Activity Monitoring (DAM) System from TriKinetics for sleep analyses. Specifically, it details the steps necessary to convert the raw data created by the DAM System into sleep duration and consolidation data, broken down into the light (L), dark (D), light:dark cycling (LD), and constant darkness (DD) phases of a behavior experiment.

  9. Estimating accumulation rates and physical properties of sediment behind a dam: Englebright Lake, Yuba River, northern California

    Science.gov (United States)

    Snyder, Noah P.; Rubin, David M.; Alpers, Charles N.; Childs, Jonathan R.; Curtis, Jennifer A.; Flint, Lorraine E.; Wright, Scott A.

    2004-11-01

    Studies of reservoir sedimentation are vital to understanding scientific and management issues related to watershed sediment budgets, depositional processes, reservoir operations, and dam decommissioning. Here we quantify the mass, organic content, and grain-size distribution of a reservoir deposit in northern California by two methods of extrapolating measurements of sediment physical properties from cores to the entire volume of impounded material. Englebright Dam, completed in 1940, is located on the Yuba River in the Sierra Nevada foothills. A research program is underway to assess the feasibility of introducing wild anadromous fish species to the river upstream of the dam. Possible management scenarios include removing or lowering the dam, which could cause downstream transport of stored sediment. In 2001 the volume of sediments deposited behind Englebright Dam occupied 25.5% of the original reservoir capacity. The physical properties of this deposit were calculated using data from a coring campaign that sampled the entire reservoir sediment thickness (6-32 m) at six locations in the downstream ˜3/4 of the reservoir. As a result, the sediment in the downstream part of the reservoir is well characterized, but in the coarse, upstream part of the reservoir, only surficial sediments were sampled, so calculations there are more uncertain. Extrapolation from one-dimensional vertical sections of sediment sampled in cores to entire three-dimensional volumes of the reservoir deposit is accomplished via two methods, using assumptions of variable and constant layer thickness. Overall, the two extrapolation methods yield nearly identical estimates of the mass of the reservoir deposit of ˜26 × 106 metric tons (t) of material, of which 64.7-68.5% is sand and gravel. Over the 61 year reservoir history this corresponds to a maximum basin-wide sediment yield of ˜340 t/km2/yr, assuming no contribution from upstream parts of the watershed impounded by other dams. The

  10. Reliability and Robustness Analysis of the Masinga Dam under Uncertainty

    Directory of Open Access Journals (Sweden)

    Hayden Postle-Floyd

    2017-02-01

    Full Text Available Kenya’s water abstraction must meet the projected growth in municipal and irrigation demand by the end of 2030 in order to achieve the country’s industrial and economic development plan. The Masinga dam, on the Tana River, is the key to meeting this goal to satisfy the growing demands whilst also continuing to provide hydroelectric power generation. This study quantitatively assesses the reliability and robustness of the Masinga dam system under uncertain future supply and demand using probabilistic climate and population projections, and examines how long-term planning may improve the longevity of the dam. River flow and demand projections are used alongside each other as inputs to the dam system simulation model linked to an optimisation engine to maximise water availability. Water availability after demand satisfaction is assessed for future years, and the projected reliability of the system is calculated for selected years. The analysis shows that maximising power generation on a short-term year-by-year basis achieves 80%, 50% and 1% reliability by 2020, 2025 and 2030 onwards, respectively. Longer term optimal planning, however, has increased system reliability to up to 95% in 2020, 80% in 2025, and more than 40% in 2030 onwards. In addition, increasing the capacity of the reservoir by around 25% can significantly improve the robustness of the system for all future time periods. This study provides a platform for analysing the implication of different planning and management of Masinga dam and suggests that careful consideration should be given to account for growing municipal needs and irrigation schemes in both the immediate and the associated Tana River basin.

  11. A review of proposed Glen Canyon Dam interim operating criteria

    Energy Technology Data Exchange (ETDEWEB)

    LaGory, K.; Hlohowskyj, I.; Tomasko, D.; Hayse, J.; Durham, L.

    1992-04-01

    Three sets of interim operating criteria for Glen Canyon Dam on the Colorado River have been proposed for the period of November 1991, to the completion of the record of decision for the Glen Canyon Dam environmental impact statement (about 1993). These criteria set specific limits on dam releases, including maximum and minimum flows, up-ramp and down-ramp rates, and maximum daily fluctuation. Under the proposed interim criteria, all of these parameters would be reduced relative to historical operating criteria to protect downstream natural resources, including sediment deposits, threatened and endangered fishes, trout, the aquatic food base, and riparian plant communities. The scientific bases of the three sets of proposed operating criteria are evaluated in the present report:(1) criteria proposed by the Research/Scientific Group, associated with the Glen Canyon Environmental Studies (GCES); (2) criteria proposed state and federal officials charged with managing downstream resources; and (3) test criteria imposed from July 1991, to November 1991. Data from Phase 1 of the GCES and other sources established that the targeted natural resources are affected by dam operations, but the specific interim criteria chosen were not supported by any existing studies. It is unlikely that irreversible changes to any of the resources would occur over the interim period if historical operating criteria remained in place. It is likely that adoption of any of the sets of proposed interim operating criteria would reduce the levels of sediment transport and erosion below Glen Canyon Dam; however, these interim criteria could result in some adverse effects, including the accumulation of debris at tributary mouths, a shift of new high-water-zone vegetation into more flood-prone areas, and further declines in vegetation in the old high water zone.

  12. Compliance Monitoring of Subyearling Chinook Salmon Survival and Passage at The Dalles Dam, Summer 2012

    Energy Technology Data Exchange (ETDEWEB)

    Skalski, J. R.; Townsend, Richard L.; Seaburg, Adam; Ploskey, Gene R.; Weiland, Mark A.; Hughes, James S.; Woodley, Christa M.; Deng, Zhiqun; Carlson, Thomas J.; Johnson, Gary E.

    2013-05-01

    The purpose of this compliance study was to estimate dam passage survival of subyearling Chinook salmon at The Dalles Dam during summer 2012. Under the 2008 Federal Columbia River Power System Biological Opinion, dam passage survival is required to be greater than or equal to 0.93 and estimated with a standard error (SE) less than or equal to 0.015. The study also estimated survival from the forebay 2 km upstream of the dam and through the tailrace to 2 km downstream of the dam, forebay residence time, tailrace egress time, spill passage efficiency (SPE), and fish passage efficiency (FPE), as required by the 2008 Columbia Basin Fish Accords.

  13. Dam operation for environmental water releases; the case of Osborne dam, Save catchment, Zimbabwe

    Science.gov (United States)

    Symphorian, Griphin R.; Madamombe, E.; van der Zaag, Pieter

    There is limited capacity in terms of knowledge and experience on how to calculate the environmental water requirements (EWR) in Zimbabwe. In this paper the EWR were assessed using the desktop model developed by [A Desktop Model used to provide an initial estimate of the ecological instream flow requirements of rivers in South Africa. Institute for Water Research, Rhodes University, Grahamstown, 2001] and a spreadsheet model (Waflex) was developed to incorporate a component of EWR in reservoir simulation. The paper assesses whether EWR as established by Hughes method can be incorporated into a reservoir simulation and water allocation model, and if it is possible to derive EWR directly from naturalised flow series. The paper further considers the possibility of using the concept of capacity sharing for allocating water rights to the environment. The results show that at present use levels the EWR in the Odzi river can easily be met. However when in future water abstractions will increase, the effective water releases for the environmental will increase significantly. Also a very simple method is proposed to establish a first approximation of EWR. The paper shows that the capacity sharing model concept is a transparent institutional arrangement, which can be used to allocate water rights to the environment. It can be concluded that the Waflex model can provide practical guidelines to catchment managers and dam operators to implement EWR.

  14. In the Land of the Dammed: Assessing Governance in Resettlement of Ghana’s Bui Dam Project

    Directory of Open Access Journals (Sweden)

    Kwabena Asiama

    2017-11-01

    Full Text Available Resettlement resulting from dam construction has raised several concerns due to the negative aftermath impacts. In Ghana, the construction of three hydroelectric dams resulted in large-scale resettlements. Given the little experience that Ghana has in resettlements, it is necessary for a robust monitoring structure for resettlements. However, this was not available in the last resettlement undertaken for the Bui Dam Project. This paper aims at developing an assessment framework for monitoring resettlement activities on customary lands from a good governance perspective. Based on four good governance principles, transparency, public participation and inclusiveness, equity and rule of law and accountability, a good governance assessment framework is built and applied to the Bui Dam Project using a case study approach. Data were collected through interviews and focus group discussion with the key actors of the resettlement project. It was first found that the planning stage of the resettlement came out with a robust plan that was to prevent the impoverishment of the affected persons. However, in the implementation of the resettlement, not all good governance principles were adhered to. In conclusion, it was found that by deconstructing the resettlement process with a good governance framework, the problematic areas of the resettlement can be effectively differentiated between the planning and implementation phases.

  15. 78 FR 77397 - Flood Control Regulations, Marshall Ford Dam (Mansfield Dam and Lake Travis), Colorado River, Texas

    Science.gov (United States)

    2013-12-23

    ... Pollution Abatement; R--Recreation; Q--Water Quality or Silt Control. \\3\\ FCA--Flood Control Act; FERC... approved water control plan of regulation may be obtained by contacting the LCRA offices in Austin, Texas... (Mansfield Dam and Lake Travis), Colorado River, Texas AGENCY: U.S. Army Corps of Engineers, DoD. ACTION...

  16. 33 CFR 100.1102 - Marine Events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and Headgate Dam...

    Science.gov (United States)

    2010-07-01

    ... Coast Guard-National Park Service agreement exists for both the Glen Canyon and Lake Mead National..., Nevada, from the Pioneer Hotel to the Edgewater Hotel. Laughlin Aquamoto Sports Challenge and Expo.... PDT. Where: That portion of the Colorado River near Laughlin, Nevada, from Davis Dam to Harrah's Hotel...

  17. Dams. Bulletin of the Technical Service of Electric Power and Big Dams; Barrages. Bulletin du Service Technique de l`Energie Electrique et des Grands Barrages

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-12-31

    Three papers were selected in this issue of the bulletin of the Technical Service of Electric Power and Big Dams. The first one concerns the experience feedback gained from the accident of the Drac river near Grenoble (France) due to a spillover at the Notre-Dame-de-Commiers` dam and which led to the death of 6 children and their teacher. The second one is a report of the conclusions of decennial and annual safety inspections of French dams, while the third one is a report of the Control Services activities for the third quarter of the year 1996 concerning the French dams in operation. (J.S.)

  18. THE EFFECT OF RESERVOIR WATER LEVEL FLUCTUATION TO THE SEEPAGE ON EARTH DAM

    Directory of Open Access Journals (Sweden)

    H. Sudardja

    2012-06-01

    Full Text Available The modeling of earth dam was carried out in a drainage and seepage tank to analyze the seepage resulting from water level fluctuation in the upstream of the dam. The dam models were made of the mixture of Mt. Merapi sand deposit with the soil of sandy-silt from Wonosari area. The variations of sand content in the mixture were 100%; 90% and 80% and the upstream slope inclinations were 1:1; 1:1.5 and 1:2. The result showed that the dams with more sandy-silt in the mixture have smaller seepage and the dams with steeper upstream slope have greater seepage. During rapid rising of water level, the dams with steeper upstream slope have a high rising rate of upstream water level and higher height of downstream slope failure. Moreover, during rapid drawdown, the dams with gentler upstream slope have a smaller rate of upstream drawdown and lower height of upstream slope failure. The dams with more sandy-silt in the mixture have a higher value of rising rate and drawdown of upstream water level but lower height of downstream and upstream slope failure. In the dam management, continuous monitoring of the seepage resulting from reservoir water level fluctuation is required to avoid dam failure. Keywords: Earth dam, rapid rising, rapid drawdown, seepage, slope failure.

  19. Removing Dams, Constructing Science: Coproduction of Undammed Riverscapes by Politics, Finance, Environment, Society and Technology

    Directory of Open Access Journals (Sweden)

    Zbigniew J. Grabowski

    2017-10-01

    Full Text Available Dam removal in the United States has continued to increase in pace and scope, transitioning from a dam-safety engineering practice to an integral component of many large-scale river restoration programmes. At the same time, knowledge around dam removals remains fragmented by disciplinary silos and a lack of knowledge transfer between communities of practice around dam removal and academia. Here we argue that dam removal science, as a study of large restoration-oriented infrastructure interventions, requires the construction of an interdisciplinary framework to integrate knowledge relevant to decision-making on dam removal. Drawing upon infrastructure studies, relational theories of coproduction of knowledge and social life, and advances within restoration ecology and dam removal science, we present a preliminary framework of dams as systems with irreducibly interrelated political, financial, environmental, social, and technological dimensions (PFESTS. With this framework we analyse three dam removals occurring over a similar time period and within the same narrow geographic region (the Mid-Columbia Region in WA and OR, USA to demonstrate how each PFESTS dimension contributed to the decision to remove the dam, how it affected the process of removing the dam, and how those dimensions continue to operate post removal in each watershed. We conclude with a discussion of a joint research and practice agenda emerging out of the PFESTS framing.

  20. Major Technologies for Safe Construction of High Earth-Rockfill Dams

    Directory of Open Access Journals (Sweden)

    Hongqi Ma

    2016-12-01

    Full Text Available The earth-rockfill dam is one of the primary dam types in the selection of high dams to be constructed in Western China, since it is characterized by favorable adaptability of the dam foundation; full utilization of local earth, rock, and building-excavated materials; low construction cost; and low cement consumption. Many major technical issues regarding earth-rockfill dams with a height of over 250 m were studied and solved successfully in the construction of the 261.5 m Nuozhadu earth core rockfill dam. This paper describes research achievements and basic conclusions; systematically summarizes the accumulated experiences from the construction of the Nuozhadu Dam and other high earth-rockfill dams; and discusses major technical issues, such as deformation control, seepage control, dam slope stability, safety and control of flood discharging, safety and quality control of dam construction, safety assessments, early warning, and other key technical difficulties. This study also provides a reference and technological support for the future construction of 300 m high earth-rockfill dams.

  1. A comparison of different rubber dam systems on a dental simulator.

    Science.gov (United States)

    Kapitan, Martin; Sustova, Zdenka; Ivancakova, Romana; Suchanek, Jakub

    2014-01-01

    The purpose of this study was to test the hypothesis that more recently developed rubber dam systems (OptraDam ® Plus and OptiDam™) are faster and easier to handle, and that the quality of isolation is not decreased. The rubber dam systems were applied in standard conditions on a dental simulator in several model clinical situations. The time of preparation, application and removal were measured and the quality of isolation was evaluated. The median time of rubber dam placement was 51 s (Q1 = 38 s; Q3 = 79 s). The shortest median time of application was with OptiDam™ (42 s), followed by a conventional rubber dam (53 s), and finally the longest was with OptraDam® Plus (58 s). The median volume of fluid remaining in the isolated space after 5 minutes was 9.5 mL (Q1 = 8 mL; Q3 = 10 mL). The largest median volume of remaining water was with OptiDam™ (10 mL), followed by a conventional rubber dam (9.5 mL) and the least with OptraDam® Plus (8.5 mL). The afore-stated hypothesis about the advantages of modern rubber dam isolation systems was accepted for OptiDam™, but rejected for OptraDam® Plus. The results could contribute to decision-making concerning the choice of rubber dam system.

  2. 2D Modeling of Flood Propagation due to the Failure of Way Ela Natural Dam

    Directory of Open Access Journals (Sweden)

    Yakti Bagus Pramono

    2018-01-01

    Full Text Available A dam break induced-flood propagation modeling is needed to reduce the losses of any potential dam failure. On the 25 July 2013, there was a dam break generated flood due to the failure of Way Ela Natural Dam that severely damaged houses and various public facilities. This study simulated the flooding induced by the failure of Way Ela Natural Dam. A two-dimensional (2D numerical model, HEC-RAS v.5, is used to simulate the overland flow. The dam failure itself is simulated using HECHMSv.4. The results of this study, the flood inundation, flood depth, and flood arrival time are verified by using available secondary data. These informations are very important to propose mitigation plans with respect to possible dam break in the future.

  3. Hydraulic and hydrologic evaluation of PAR Pond Dam. Technical evaluation report

    Energy Technology Data Exchange (ETDEWEB)

    Reich, M.; Wang, P.C.; Khanbilvardi, R.; Bezler, P.

    1993-10-01

    The PAR Pond Dam at Savannah River Plant was constructed in 1958--1959. Seepage, depressions, boils and spring flow were observed in varying locations on the dam in the last few years. Comprehensive geotechnical and hydraulic investigations pertaining to the effects of the above observations on the abilities of the dam to withstand future floods were made in 1991 and early 1993 where dam capacity to survive flooding and seismic events were evaluated. Brookhaven National Laboratory (BNL) was asked by the Department of Energy (EH) to carry out an independent review of the PAR Pond Dam response to future flooding and seismic events. This report addresses the studies made to evaluate the capacity of the dam to survive floods. A companion report will summarize the evaluations performed to assess the seismic capacity of the dam.

  4. Potential Risk Analysis of Tailings Dam under Preloading Condition and Its Countermeasures

    Directory of Open Access Journals (Sweden)

    Shuren Wang

    2015-01-01

    Full Text Available It is very important for mine production safety to ensure the stability of the tailings dam. Taking a flatland tailings pond as the background, a threedimensional computational model was built based on a tailings dam under mullock heap preloading condition. Considering the current operating water level conditions, a liquid-solid coupling analysis of the model was conducted.The deformation characteristics of the tailings dam were revealed during successive preloading at the front of the dam. The safety factor and the potential slide face of the tailings dam were calculated under different conditions using the strength reduction method. The results show that the tailings dam in its current condition is basically stable, but if the mullock heap continues to be heightened, the tailings dam will become unstable. Therefore, in order to limit the height of the mullock heap, establishing a monitor and early warning mechanism are put forward to ensure mine production safety.

  5. After Three Gorges Dam: What have we learned?

    Science.gov (United States)

    Natali, J.; Williams, P.; Wong, R.; Kondolf, G. M.

    2013-12-01

    China is at a critical point in its development path. By investing heavily in large-scale infrastructure, the rewards of economic growth weigh against long-term environmental and social costs. The construction of Three Gorges Dam, the world's largest hydroelectric project, began in 1994. Between 2002 and 2010, its 660 kilometer reservoir filled behind a 181 meter dam, displacing at least 1.4 million people and transforming Asia's longest river (the Yangtze) while generating nearly 100 billion kWh/yr of electricity -- 2.85% of China's current electric power usage. As the mega-project progenitor in a cascade of planned dams, the Three Gorges Dam emerges as a test case for how China will plan, execute and mitigate its development pathway and the transformation of its environment. Post-Project Assessments (PPA) provide a systematic, scientific method for improving the practice of environmental management - particularly as they apply to human intervention in river systems. In 2012, the Department of Landscape Architecture and Environmental Planning at University of California, Berkeley organized a symposium-based PPA for the Three Gorges Dam on the Yangtze River. Prior to this symposium, the twelve invited Chinese scientists, engineers and economists with recent research on Three Gorges Dam had not had the opportunity to present their evaluations together in an open, public forum. With a 50-year planning horizon, the symposium's five sessions centered on impacts on flows, geomorphology, geologic hazards, the environment and socioeconomic effects. Three Gorges' project goals focused on flood control, hydropower and improved navigation. According to expert research, major changes in sediment budget and flow regime from reservoir operation have significantly reduced sediment discharge into the downstream river and estuary, initiating a series of geomorphic changes with ecological and social impacts. While the dam reduces high flow stages from floods originating above the

  6. National Dam Safety Program. Welch Lake Dam (MO 10733), Missouri - Kansas City Basin, Boone County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1981-03-01

    Operating Facilities 10 4.4 Description of Any Warning System in Effect 10 4.5 Evaluation 10 SECTION 5 - HIDRAULIC /HYDROLOGIC 5.1 Evaluation of Features 11...Hm + 1/4L Y) A = 1/2 T (2d -A Y)c Q = (A 3 g/T) 0 .5 where: d = critical depth (feet) H c = available specific energy which is taken to be the heightm

  7. National Dam Inspection Program. Mianus Reservoir Dam (CT 00050). Connecticut Western Coastal Area, Stamford, Connecticut. Phase I Inspection Report.

    Science.gov (United States)

    1978-09-01

    surface prior to establishment of turf cover and possibly shallow creep of the surface materials occurring during frost meiing periods. 3. The measured...4 0C4O~D "...... ____~~~ __ __ _ P_ *11 0% a 4 9 D 4 4t49 O P9 W0 6 - - - - - .- - ts I I I I I I 1 - - . - - I*--- -n 0 -.- 0 n( 0 o% _4 _4 44 C4 -4

  8. National Dam Safety Program. Winnetonka Lake Dam (MO 11011), Missouri - Kansas City Basin, Clay County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1979-04-01

    either streetlight foundations or the remnants of an aerial trolley ride at the earlier amusement park. At numerous locations along the downstream edge...September 14, 1977 as reported by the Kansas City District, Corps of Engineers. The absence of channel protection in the trench has led to erosion

  9. National Dam Safety Program. Wood Lake Dam (MO 20135), Missouri - Kansas City Basin, Jackson County, Missouri. Phase I Inspection Report.

    Science.gov (United States)

    1978-08-01

    official nawe snd address, includinog office a arbol . of the mneii pEteelo 1, harIs.4ue atm.f. ads", Jr., dehfirmio .e 0D Dire, toewe SMO X eiPiaftioeefon...ilssfatito DowtogradooInlaefte of 0 e Mpas -e BM IS1 the kiew , I alichs alis too tde - Part If apsne enter to 1%0 the 6dac gleesifcti demiaebeoie of the

  10. National Program for Inspection of Non-Federal Dams. Richville Dam (VT 00074) Richelieu River Basin, Shoreham.

    Science.gov (United States)

    1978-09-01

    the Champlain Thrust Fault uplifted the Paleozoic carbonates and quartzites to overlie the younger shales. A branch of this fault known as the Orwell ...abutment will be overtopped) is 260 cfs. iPlanimetered from Bridport, Vt.; Sudbury, Vt.; Orwell , Vt; Vt-N.Y.; and Cornwall, Vt. 7.5 minute quad theets...the following pertinent facts with relation S to this project frc. testimony of George ’?. Davis and Roger Seamans of thu Fish & Ga-e Service: (1) The

  11. Dam Removal Information Portal (DRIP)—A map-based resource linking scientific studies and associated geospatial information about dam removals

    Science.gov (United States)

    Duda, Jeffrey J.; Wieferich, Daniel J.; Bristol, R. Sky; Bellmore, J. Ryan; Hutchison, Vivian B.; Vittum, Katherine M.; Craig, Laura; Warrick, Jonathan A.

    2016-08-18

    The removal of dams has recently increased over historical levels due to aging infrastructure, changing societal needs, and modern safety standards rendering some dams obsolete. Where possibilities for river restoration, or improved safety, exceed the benefits of retaining a dam, removal is more often being considered as a viable option. Yet, as this is a relatively new development in the history of river management, science is just beginning to guide our understanding of the physical and ecological implications of dam removal. Ultimately, the “lessons learned” from previous scientific studies on the outcomes dam removal could inform future scientific understanding of ecosystem outcomes, as well as aid in decision-making by stakeholders. We created a database visualization tool, the Dam Removal Information Portal (DRIP), to display map-based, interactive information about the scientific studies associated with dam removals. Serving both as a bibliographic source as well as a link to other existing databases like the National Hydrography Dataset, the derived National Dam Removal Science Database serves as the foundation for a Web-based application that synthesizes the existing scientific studies associated with dam removals. Thus, using the DRIP application, users can explore information about completed dam removal projects (for example, their location, height, and date removed), as well as discover sources and details of associated of scientific studies. As such, DRIP is intended to be a dynamic collection of scientific information related to dams that have been removed in the United States and elsewhere. This report describes the architecture and concepts of this “metaknowledge” database and the DRIP visualization tool.

  12. Characteristics of pollutant load from a dam reservoir watershed : Case study on Seomjinkang dam reservoir

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Yo-Sang; Kang, Boung-Soo [Water Resources Research Institute, Taejeon(Korea)

    2000-12-31

    The investigation of water quality was performed at the upstream of Seomjinkang dam reservoir for the examination of pollutant load characteristics of the reservoir watershed during flood and normal flow periods. The highest water quality concentration was occurred at Yongsan during normal flow period where it has been more polluted by population and livestock than other sites. Pollutant load varied depending on the sampling site, rainfall intensity and antecedent precipitation during the rainy period. Based on the water quality data measured from 1998 to 1999, the average concentration during rainy period was much higher than that of non-rainy period: BOD was 1.2-1.4 times, COD 1.2-1.7 times, SS 2.6-5.4 times, T-N 2.3-3.0 times, and T-P 2.4-7.5 times respectively. When the pollutant load measured during 7 different rainy periods in 1999 was compared with total pollutant load in 1999, the BOD and COD load measured during the 7 different rainy periods were 28% that is about 1.6 times as high as those of 1999. On the other hand, the rainfall amount measured during the 7 different rainy periods was about 17.5% of total rainfall amount in 1999. The total pollutant load of TN and TP measured during the 7 different rainy periods was almost 50% of total TN and TP loads in 1999. In case of SS, it was 72.8%. It was concluded that the inflow of pollutants into the lake during the rainy period held a high portion of total inflow in 1999. It was suggested that long-term water quality monitoring be performed to better quantity pollutant load to the lake especially during rainy periods. (author). 8 refs., 6 tabs., 4 figs.

  13. Evidence against small dam removal as an ecological disturbance: Benthic macroinvertebrate and channel responses to dam removals in Oregon, USA

    Science.gov (United States)

    Tullos, D. D.

    2012-12-01

    A dominant concern for environmental managers is often the biological consequences of the physical disturbance generated by sediment pulses, such as those associated with dam removal or sediment flushing from existing dams. However, limited field data exists against which concerns regarding planned removals can be evaluated. This study documents an investigation of biophysical interactions related to sediment pulses from dam removals, with emphasis on a) the spatial extent and magnitude of disturbance to channel habitat and benthic macroinvertebrate community, and b) the rate and spatial patterns of channel and invertebrate community recovery over time. We analyzed field observations, collected in an upstream-downstream BACI study design, from three dam removals of varying size and channel substrate: Brownsville Dam, Calapooia River (height = 2.5 m, D50 = 59 m), Chiloquin Dam, Sprague River (height = 3.4 m, D50 = 0.15 mm), and Savage Rapids Dam, Rogue River (height = 12 m, D50 = 8 m). At each site, we investigated how elements of the physical channel related to disturbance (grain size and variability, bed stability, bed complexity) and benthic macroinvertebrate community (species richness, functional traits) changed over space and time. We projected that hypothesized changes in the physical channel (reduction in bed complexity, site-specific changes in bed mobility, site-specific grain size changes) following the sediment pulse would lead to reduction in species richness and a transition to functional traits (short lived, rapid reproduction, tolerant of mobile beds) affiliated with sediment disturbance. However, results indicate that our hypothesized channel changes were not consistently validated across the sites. Further, we found little evidence of substantial impact of the sediment pulse on the invertebrate communities, though some variability in functional traits may be attributable to dam removal at Savage Rapids. More specifically, we found that: a) Channel

  14. Intergarted geophysical investigations by GPR and ERT on the largest rock fill dam in Europe: Monte Cotugno dam (Southern Italy)

    Science.gov (United States)

    Loperte, A.; Bavusi, M.; Cerverizzo, G.; Lapenna, V.; Soldovieri, F.

    2012-04-01

    This work is concerned with the first results of a survey based on the integration of geophysical techniques for the inspection of the Monte Cotugno dam, the largest rock fill dam in Europe. The Monte Cotugno dam, managed by National Irrigation Development and Agrarian Transformation in Puglia, Basilicata and Irpinia is located on the Sinni river (Basilicata District, South Italy) and represents the nodal point in the whole hydraulic system on the Ionic side of Italy; in fact, the dam allows harnessing of the Sinni river water for agricultural, industrial, drinking and domestic purposes. The dam is of the zoned type and consists of a central core in sandy silt and of gravelly-sandy shoulders; its water tightness is ensured by a bituminous conglomerate facing on the upstream side, welded at the bottom to the foundation sealing system. The latter is about 1,900m long and consist of a massive concrete cut-off wall based on the marly-clay formation, 300m long on the right and 600 m long on the left side. On the valley bottom it is made up of a reinforced concrete cut-off wall that is inserted in the marly-clay formation and is surmounted by an inspection and percolation water collection tunnel. The watertight face consists of a bottom levelling layer 7-8 cm thick in semi open-graded bituminous concrete, a 5 cm separation layer in dense-graded bituminous concrete, a drainage layer in very open-graded concrete varying in thickness from 10 to 16 cm from the top of the dam down, two 4-cm top layers in dense-graded bituminous concrete with stepped joints, a finishing sealing coat containing 1.5 kg/cm2 of asphalt. The shallowest part of this layering is started to show incipient small detachments due to thermal solicitations; these detachments represent a possible way for water infiltration in the dam. In this framework, it was decided to perform the identification, characterization and evaluation of the potential loss of water through small cracks in the bituminous concrete

  15. Parallel simulation of dam-break flow by OpenMP-based SPH method

    Science.gov (United States)

    Luo, Zhao; Wu, Qihe; Zhang, Lei

    2017-10-01

    Smoothed particle hydrodynamics (SPH), a Lagrangian mesh-free particle numerical method, is suitable for simulating strong impact and large deformation problems. In the method, quantities of particles can ensure high precision. However, with the increase of the particle numbers, the calculation efficiency becomes a challenge for applying the method to the engineering practice. OpenMP, a Portable Shared Memory Parallel Programming, is a great solution to improve the efficiency of SPH algorithm. In the paper, dam-break flow is simulated by SPH method. Vortex centre is discovered, the role of numerical technique is compared. At the same time, two parallel schemes for SPH algorithm is introduced, the speedup ratio with respect to number of particles or threads are revealed.

  16. Subsidence hazards as a consequence of dam, reservoir and tunnel construction.

    Directory of Open Access Journals (Sweden)

    Milanovic Petar

    2002-01-01

    Full Text Available Considering all man-made structures in karst areas, dams, reservoirs and tunnels are the most vulnerable in relation to induced subsidence and caverns. Reservoirs that are located entirely or partially on karstified rocks covered with unconsolidated sediments are especially subsidence-prone. As a consequence of induced subsidence a number of reservoirs in karst areas failed and were never fully filled. Such subsidence formation is very damaging because the development is unpredictable and practically instantaneous. Reservoirs in karst areas may fail to fill despite an extensive site investigation programs and sealing treatment. Every problem is unique and past experiences are never repeated. This review focuses on the meaning and consequences of selected prominent examples, but the conclusions reached are valid for subsidence problems related to man-made structures in general.

  17. Nepal’s Constructive Dialogue on Dams and Development

    Directory of Open Access Journals (Sweden)

    Ajaya Dixit

    2010-06-01

    The findings of the two consultative reviews meant little to either subsequent governments of Nepal or to the international aid industry, despite the opportunity for change that the dramatic democratic movement of 2005/2006 offered – government hydrocracy and the political parties guiding it, as well as international donors, continued to favour the conventional model of dam building. Their silence about the review is inexplicable, especially in light of the flaws in, and controversy surrounding, the ADB-funded Kali Gandaki A and German-funded Middle Marsyangdi dams, both of which followed conventional practice. A new electricity act currently tabled in the parliament also fails to take into account many of the lessons that should have been learnt so easily from past mistakes.

  18. Eutrophication levels of some South African impoundments. IV. Vaal Dam

    CSIR Research Space (South Africa)

    Steyn, DJ

    1976-04-01

    Full Text Available -nt clischargc?cl directly itito tlit- impottnclment_ These vititi t-o,n1iarc lavt,tiralilv with the rc-spccti~ t? valttcs ?or Rietvlci Da (817 and 1-1:3: Stcc-n it of,. 1975a). l-larthitcspoort Darn (7. audI 13,0: Stc~n et of., 19751i) and Rttodcplaat Dam (7...,17 2.4: StcVn it of,, 1975t3, VatI Dam water with thc? addition of ID per cent Iv!?) I?Il was limited tlirottghotit hr tntrogi-n (Fig, 1)_This was also t case hr Rictylci IStcS~u tt (if., 1975:6, Hartliccspoort (Ste5/n TABLE I THE ALGAL GROWTH RATE...

  19. Ice loads on dams: field measurements and analysis

    Energy Technology Data Exchange (ETDEWEB)

    Comfort, G.; Abdelnour, R.; Gong, Y.; Dinovitzer, A. [Fleet Technology Ltd., Kanata, ON (Canada)

    1996-12-31

    A four-year study was undertaken to measure ice loads on hydroelectric dams. The various components of ice loads acting on a dam face -- the residual load, the increase in load due to rises in temperature, and the increase in load associated with water level changes -- were studied separately. Results showed that higher line loads were produced with a combination of water level and ice temperature changes, as compared to sites where water level changes were negligible. Knowledge of static ice loads on hydroelectric structures was improved as a result of these studies, permitting the development of preliminary ice load predictors in the laboratory which show good agreement with observed field data. 7 refs., 2 tabs., 18 figs.

  20. Internal erosion under spillway rested on an embankment dam

    Directory of Open Access Journals (Sweden)

    Mohammad Sedghi-Asl

    2015-12-01

    Full Text Available In this paper we investigate the mechanism of internal erosion caused in the right abutment of the Shahghasem dam’s spillway. Shahghasem dam is an earthen dam located in Yasouj, in southwest of Iran. A significant hole and pipe have been observed in the corner of the right abutment from upstream view. The foundation is Marlstone, which has low cohesion and susceptible for internal erosion and piping in some conditions. Going through details of the design maps has shown that Lane’s criteria for selecting safe dimensions of the seepage control measures have not been considered properly. A series of the supportive walls are designed to attach to the right part of the spillway in order to increase the length of seepage. The pipe route of the erosion should also be grouted with high quality concrete.

  1. Reliability Analysis of Free Jet Scour Below Dams

    Directory of Open Access Journals (Sweden)

    Chuanqi Li

    2012-12-01

    Full Text Available Current formulas for calculating scour depth below of a free over fall are mostly deterministic in nature and do not adequately consider the uncertainties of various scouring parameters. A reliability-based assessment of scour, taking into account uncertainties of parameters and coefficients involved, should be performed. This paper studies the reliability of a dam foundation under the threat of scour. A model for calculating the reliability of scour and estimating the probability of failure of the dam foundation subjected to scour is presented. The Maximum Entropy Method is applied to construct the probability density function (PDF of the performance function subject to the moment constraints. Monte Carlo simulation (MCS is applied for uncertainty analysis. An example is considered, and there liability of its scour is computed, the influence of various random variables on the probability failure is analyzed.

  2. Role of the check dam in land development on the Loess Plateau, China

    Science.gov (United States)

    Xu, Xiang-Zhou; Zhang, Luo-Hao; Zhu, Tongxin; Dang, Tian-Min; Zhang, Hong-Wu; Xu, Shi-Guo

    2017-04-01

    Check dam is one of the most effective measures to reduce flow connectivity, which can retain soil and water, and increase land productivity. More than 100,000 check dams have been built on the Loess Plateau since 1950s. However, quantifying the effect of check dams on water resources and water environments remains a challenge. In this study, an in-depth field investigation together with a credible statistical analysis was carried out in two representative catchments on the Loess Plateau, Nanxiaohegou Catchment and Jiuyuangou Catchment, to assess the effectiveness of check dams in soil, water and nutrients conservation. The results show: (1) Check dam plays an important role in conserving water, soil, and nutrients on the Loess Plateau. About half of the total transported water and more than 80 % of the total transported soil and nutrients, had been locally retained in the selected catchments. Hence check dams had a significant benefit to improve soil fertility in the small watersheds, and reducing water pollution downstream of dams. (2) Compared to terrace farmlands, forest lands and grasslands, check-dam lands were much more important in conserving water, soil and nutrients in the catchments. Nearly 50% of the reduced water and more than 70% of the stored soil and nutrients in the study catchments were solely retained by the check dams, whereas the area of the dam lands was less than 7% of the total conservation land area. (3) Check dams are still effective in large storms even if dams were damaged by floods. It is often assumed that check dams could only retain sediment in small flood events whereas most of the stored soil may be washed out as the dams may be destroyed in a disastrous flood. Furthermore, if a major check dam, namely the key project dam, was built in the gully outlet, the flood could be controlled, and thereupon the dam-break can be also avoided. We suggest that a compensation and incentive policy be implemented on dam building to realize the

  3. Modelling air―water flows in bottom outlets of dams

    OpenAIRE

    Liu, Ting

    2014-01-01

    If air is entrained in a bottom outlet of a dam in an uncontrolled way, the resulting air pockets may cause problems such as blowback, blowout and loss of discharge capacity. In order to provide guidance for bottom outlet design and operation, this study examines how governing parameters affect air entrainment, air-pocket transport and de-aeration and the surrounding flow structure in pipe flows. Both experimental and numerical approaches are used. Air can be entrained into the bottom outlet ...

  4. Flood Water Level Mapping and Prediction Due to Dam Failures

    Science.gov (United States)

    Musa, S.; Adnan, M. S.; Ahmad, N. A.; Ayob, S.

    2016-07-01

    Sembrong dam has undergone overflow failure. Flooding has been reported to hit the town, covering an area of up to Parit Raja, located in the district of Batu Pahat. This study aims to identify the areas that will be affected by flood in the event of a dam failure in Sembrong Dam, Kluang, Johor at a maximum level. To grasp the extent, the flood inundation maps have been generated by using the InfoWorks ICM and GIS software. By using these maps, information such as the depth and extent of floods can be identified the main ares flooded. The flood map was created starting with the collection of relevant data such as measuring the depth of the river and a maximum flow rate for Sembrong Dam. The data were obtained from the Drainage and Irrigation Department Malaysia and the Department of Survey and Mapping and HLA Associates Sdn. Bhd. Then, the data were analyzed according to the established Info Works ICM method. The results found that the flooded area were listed at Sri Lalang, Parit Sagil, Parit Sonto, Sri Paya, Parit Raja, Parit Sempadan, Talang Bunut, Asam Bubok, Tanjung Sembrong, Sungai Rambut and Parit Haji Talib. Flood depth obtained for the related area started from 0.5 m up to 1.2 m. As a conclusion, the flood emanating from this study include the area around the town of Ayer Hitam up to Parit Raja approximately of more than 20 km distance. This may give bad implication to residents around these areas. In future studies, other rivers such as Sungai Batu Pahat should be considered for this study to predict and reduce the yearly flood victims for this area.

  5. The Davis Island Lock and Dam 1870-1922

    Science.gov (United States)

    1985-01-01

    flow and began dredging the channel before he was sent south to Mexico with the Army in 1846. He built several of his dams at the ripples immedi...it from the Monongahela across the Point and through the Triangle, causing im- mense traffic jams and destroying city streets in the process. A Pitts...The Mississippi River channel was to be deepened, especially at the bars obstructing its outlet into the Gulf of Mexico . The North- ern Route involved

  6. Ecology. Three-Gorges Dam--experiment in habitat fragmentation?

    Science.gov (United States)

    Wu, Jianguo; Huang, Jianhui; Han, Xingguo; Xie, Zongqiang; Gao, Xianming

    2003-05-23

    Habitat fragmentation is the primary cause of the loss of biodiversity and ecosystem services, but its underlying processes and mechanisms remain poorly understood. Studies of islands and insular terrestrial habitats are essential for improving our understanding of habitat fragmentation. We argue that the Three-Gorges Dam, the largest that humans have ever created, presents a unique grand-scale natural experiment that allows ecologists to address a range of critical questions concerning the theory and practice of biodiversity conservation.

  7. Safety Monitoring Index of High Concrete Gravity Dam Based on Failure Mechanism of Instability

    Directory of Open Access Journals (Sweden)

    Shaowei Wang

    2013-01-01

    Full Text Available Traditional methods of establishing dam safety monitoring index are mostly based on the observation data. According to the performance of dam-foundation system under the experienced loads, alarm values and extreme values are predicted for monitoring quantities. As for some dams, the potential most unfavorable loads may not yet have appeared, and dam bearing capacity may also decrease over time. Therefore, monitoring index determined by these methods can not reflect whether the dam will break or not. Based on the finite element method, to study the progressive instability failures of high concrete gravity dams under the failure modes of material strength degradation or uncertainty and extreme environmental loads during operation, methods of strength reduction and overloading are, respectively, used. Typical stages in the instability processes are identified by evaluation indicators of dam displacement, the connectivity of yield zones, and the yield volume ratio of dam concretes; then instability safety monitoring indexes are hierarchically determined according to these typical symptoms. At last, a case study is performed to give a more detailed introduction about the process of establishing safety monitoring index for high concrete gravity dams based on the failure mechanism of instability, and three grades of monitoring index related to different safety situations are established for this gravity dam.

  8. The Politics, Development and Problems of Small Irrigation Dams in Malawi: Experiences from Mzuzu ADD

    Directory of Open Access Journals (Sweden)

    Bryson Gwiyani Nkhoma

    2011-10-01

    Full Text Available The paper examines the progress made regarding the development of small irrigation dams in Malawi with the view of establishing their significance in improving rural livelihoods in the country. The paper adopts a political economy theory and a qualitative research approach. Evidence from Mzuzu Agricultural Development Division (ADD, where small reservoirs acquire specific relevance, shows that despite the efforts made, the development of small dams is making little progress. The paper highlights that problems of top-down planning, high investment costs, negligence of national and local interests, over-dependency on donors, and conflicts over the use of dams – which made large-scale dams unpopular in the 1990s – continue to affect the development of small irrigation dams in Malawi. The paper argues that small irrigation dams should not be simplistically seen as a panacea to the problems of large-scale irrigation dams. Like any other projects, small dams are historically and socially constructed through interests of different actors in the local settings, and can only succeed if actors, especially those from formal institutions, develop adaptive learning towards apparent conflicting relations that develop among them in the process of implementation. In the case of Mzuzu ADD, it was the failure of the government to develop this adaptive learning to the contestations and conflicts among these actors that undermined successful implementation of small irrigation dams. The paper recommends the need to consider local circumstances, politics, interests, rights and institutions when investing in small irrigation dams.

  9. DNA Adenine Methyltransferase (Dam Overexpression Impairs Photorhabdus luminescens Motility and Virulence

    Directory of Open Access Journals (Sweden)

    Amaury Payelleville

    2017-09-01

    Full Text Available Dam, the most described bacterial DNA-methyltransferase, is widespread in gamma-proteobacteria. Dam DNA methylation can play a role in various genes expression and is involved in pathogenicity of several bacterial species. The purpose of this study was to determine the role played by the dam ortholog identified in the entomopathogenic bacterium Photorhabdus luminescens. Complementation assays of an Escherichia coli dam mutant showed the restoration of the DNA methylation state of the parental strain. Overexpression of dam in P. luminescens did not impair growth ability in vitro. In contrast, compared to a control strain harboring an empty plasmid, a significant decrease in motility was observed in the dam-overexpressing strain. A transcriptome analysis revealed the differential expression of 208 genes between the two strains. In particular, the downregulation of flagellar genes was observed in the dam-overexpressing strain. In the closely related bacterium Xenorhabdus nematophila, dam overexpression also impaired motility. In addition, the dam-overexpressing P. luminescens strain showed a delayed virulence compared to that of the control strain after injection in larvae of the lepidopteran Spodoptera littoralis. These results reveal that Dam plays a major role during P. luminescens insect infection.

  10. Discussion on the Safety Factors of Slopes Recommended for Small Dams

    Directory of Open Access Journals (Sweden)

    Jan Vrubel

    2017-01-01

    Full Text Available The design and assessment of the slope stability of small embankment dams is usually not carried out using slope stability calculations but rather by the comparison of proposed or existing dam slopes with those recommended by technical standards or guidelines. Practical experience shows that in many cases the slopes of small dams are steeper than those recommended. However, most of such steeper slopes at existing dams do not exhibit any visible signs of instability, defects or sliding. For the dam owner and also for dam stability engineers, the safety of the slope, expressed e.g. via a factor of safety, is crucial. The aim of this study is to evaluate the safety margin provided by recommended slopes. The factor of safety was evaluated for several dam shape and layout variants via the shear strength reduction method using PLAXIS software. The study covers various dam geometries, dam core and shoulder positions and parameter values of utilised soils. Three load cases were considered: one with a steady state seepage condition and two with different reservoir water level drawdown velocities – standard and critical. As numerous older small dams lack a drainage system, variants with and without a toe drain were assessed. Calculated factors of safety were compared with required values specified by national standards and guidelines.

  11. Dams in the Cadillac Desert: downstream effects in a geomorphic context.

    Science.gov (United States)

    Sabo, John L; Bestgen, Kevin; Graf, Will; Sinha, Tushar; Wohl, Ellen E

    2012-02-01

    This paper was motivated by the 25th anniversary of the publication of Marc Reisner's book, Cadillac Desert: The American West and its Disappearing Water. Dams are ubiquitous on rivers in the United States, and large dams and storage reservoirs are the hallmark of western U.S. riverscapes. The effects of dams on downstream river ecosystems have attracted much attention and are encapsulated in the serial discontinuity concept (SDC). In the SDC, dams create abrupt shifts in continua of downstream changes in physical and biotic properties. In this paper, we develop a framework for understanding how channel geometry and network structure influence how the physical components of habitat and the biota rebound from discontinuities set up by large dams. We apply this framework to data describing the flow regime, temperature, sediment flux, and fish community composition below Garrison Dam on the Missouri River, Glen Canyon Dam on the Colorado River, and Flaming Gorge Dam on the Green River. Sediment flux in dam tailwaters is under strong control by channel geometry. By contrast, dam-related changes in temperature and flow variation are not significantly modulated by channel geometry or tributary inputs if flow volumes are small (Missouri and Colorado River tributaries). Instead, small tributaries provide near-native conditions (flow and temperature variation) and, as such, provide key refuges for biota from novel habitats in mainstem rivers below large dams. Unregulated tributaries that are large relative to their respective mainstem (e.g., Yampa River) provide refuges as well as significant amelioration of flow and temperature effects from upstream dams. Finally, the proportion of native fish increases with distance from dam and exhibits sharp increases near tributary junctions. These results suggest that tributaries-even minor ones in terms of relative discharge-act as key refugia for native species in regulated river networks. Moreover, large, unregulated tributaries

  12. EVALUATION OF THE WATER TROPHIC STATE OF WAPIENICA DAM RESERVOIR

    Directory of Open Access Journals (Sweden)

    Ewa Jachniak

    2015-01-01

    Full Text Available In this publication the trophy level of Wapienica dam reservoir, based on the composition species of planktonic algae and their biomass, and concentrations of chlorophyll a, was defined. The research was conducted during the vegetative season in 2013 year; the samples were taken from two research points (W1 – the part of river Wapienica inflow to reservoir and W2 – the part of the reservoir dam by using bathometer. The whole biomass of planktonic algae and concentration of chlorophyll a from two research areas were low and it allowed to classify water of this reservoir to oligo-/ mesotrophic. Only in the part of the reservoir dam, in summer season, an increased trophy level was observed (Heinonen 1980. A similar trophic character (oligo-/ mesotrophic of the water reservoir was also indicated by algae species: Achnanthes lanceolata (Bréb. Grun. in Cl. and Grun., Chrysoccoccus minutus (Fritsch Nygaard. For a temporary increase of the trophy level, the diatom Nitzschia acicularis (Kütz. W. Sm. could indicate, because it is a typical species in poorly eutrophic water. The green algae (Pediastrum and Coelastrum, which were observed in summer season could also indicate for a rise of the trophic state, because they are typical for eutrophic water.

  13. Hydroacoustic Evaluation of Fish Passage through Bonneville Dam in 2004

    Energy Technology Data Exchange (ETDEWEB)

    Ploskey, Gene R.; Weiland, Mark A.; Schilt, Carl R.; Kim, Jina; Johnson, Peter N.; Hanks, Michael E.; Patterson, Deborah S.; Skalski, John R.; Hedgepeth, J

    2005-12-22

    The Portland District of the U.S. Army Corps of Engineers requested that the Pacific Northwest National Laboratory (PNNL) conduct fish-passage studies at Bonneville Dam in 2004. These studies support the Portland District's goal of maximizing fish-passage efficiency (FPE) and obtaining 95% survival for juvenile salmon passing Bonneville Dam. Major passage routes include 10 turbines and a sluiceway at Powerhouse 1 (B1), an 18-bay spillway, and eight turbines and a sluiceway at Powerhouse 2 (B2). In this report, we present results of four studies related to juvenile salmonid passage at Bonneville Dam. The studies were conducted between April 15 and July 15, 2004, encompassing most of the spring and summer migrations. Studies included evaluations of (1) Project fish passage efficiency and other major passage metrics, (2) B2 fish guidance efficiency and gap loss, (3) smolt approach and fate at the B2 Corner Collector (B2CC), and (4) B2 vertical barrier screen head differential.

  14. Dam Removals and River Restoration in International Perspective

    Directory of Open Access Journals (Sweden)

    Chris S. Sneddon

    2017-10-01

    Full Text Available In the Anthropocene era, questions over institutions, economics, culture and politics are central to the promotion of water-society relations that enhance biophysical resilience and democratic modes of environmental governance. The removal of dams and weirs from river systems may well signal an important shift in how human actors value and utilize rivers. Yet the removal of water infrastructure is often lengthy, institutionally complex, and characterized by social conflict. This Special Issue draws insights from case studies of recent efforts in North America and Europe to restore river systems through dam and weir removal. These cases include both instances where removal has come to fruition in conjunction with efforts to rehabilitate aquatic systems and instances where removal has been stymied by a constellation of institutional, political and cultural factors. Drawing from diverse theoretical frames and methodological approaches, the authors present novel ways to conceptualize water-society relations using the lens of dam removal and river restoration, as well as crucial reminders of the multiple biophysical and social dimensions of restoration initiatives for water resource practitioners interested in the rehabilitation of socioecological systems.

  15. Paddle River Dam : review of probable maximum flood

    Energy Technology Data Exchange (ETDEWEB)

    Clark, D. [UMA Engineering Ltd., Edmonton, AB (Canada); Neill, C.R. [Northwest Hydraulic Consultants Ltd., Edmonton, AB (Canada)

    2008-07-01

    The Paddle River Dam was built in northern Alberta in the mid 1980s for flood control. According to the 1999 Canadian Dam Association (CDA) guidelines, this 35 metre high, zoned earthfill dam with a spillway capacity sized to accommodate a probable maximum flood (PMF) is rated as a very high hazard. At the time of design, it was estimated to have a peak flow rate of 858 centimetres. A review of the PMF in 2002 increased the peak flow rate to 1,890 centimetres. In light of a 2007 revision of the CDA safety guidelines, the PMF was reviewed and the inflow design flood (IDF) was re-evaluated. This paper discussed the levels of uncertainty inherent in PMF determinations and some difficulties encountered with the SSARR hydrologic model and the HEC-RAS hydraulic model in unsteady mode. The paper also presented and discussed the analysis used to determine incremental damages, upon which a new IDF of 840 m{sup 3}/s was recommended. The paper discussed the PMF review, modelling methodology, hydrograph inputs, and incremental damage of floods. It was concluded that the PMF review, involving hydraulic routing through the valley bottom together with reconsideration of the previous runoff modeling provides evidence that the peak reservoir inflow could reasonably be reduced by approximately 20 per cent. 8 refs., 5 tabs., 8 figs.

  16. Seepage assessment of Hattian Bala landslide dam using hydrological data

    Energy Technology Data Exchange (ETDEWEB)

    Niazi, F.S. [Georgia Inst.of Technology, Atlanta, GA (United States). School of Civil and Environmental Engineering; Akram, T.; Haider, S. [National Univ. of Sciences and Technology, Islamabad (Pakistan). National Inst.of Transportation

    2009-07-01

    In 2005, a M7.6 earthquake in Pakistan triggered a landslide that blocked two tributaries of the Jhelum River at their confluence, near Muzzafarabad, Azad Kashmir, creating two lakes. Flooding upstream of this natural dam can cause substantial downstream damage in case of failure. This paper presented the results of a study aimed at evaluating the inflow of water into the dam body through seepage from the larger lake by utilizing hydrological data. The objectives of the study were to assess the possibility of seepage from Karli Lake by comparing daily upstream inflows from both channels with the downstream discharges; estimate the loss of water into the dam body from Karli Lake by comparing the actual daily increase in volume in the Karli Lake with the daily upstream inflow volume of Karli channel; and estimate the seepage volume by combining the upstream inflow volume and comparing it with the downstream discharge volume. Although the desired results could not be obtained due to inadequate data, a practical method was developed for use in similar cases. 10 refs., 1 tab., 13 figs.

  17. Determination of metals in water from Billings dam, Sao Paulo

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Talita; Sarkis, Jorge E.S.; Ulrich, Joao C.; Yamaguishi, Renata Bazante, E-mail: taoliveira@ipen.br, E-mail: jesarkis@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Menezes, Luciana Carvalho Bezerra de; Castro, Paula Maria Genova de; Monteiro Junior, Adalberto Jose; Maruyama, Lidia Sumile, E-mail: lcbm@usp.br [Instituto de Pesca, (IP/SAA-SP), Sao Paulo, SP (Brazil). Secretaria da Agricultura e Abastecimento do Estado de Sao Paulo

    2013-07-01

    The Billings reservoir, located in Sao Paulo, Brazil, is used for several purposes such as: water supply, electric generation, fishing and leisure. Although considered an area of environmental protection, in recent years the dam has suffered diverse environmental aggressions including the release of toxic metals. This study presents a recent evaluation of metal contents along the Dam. Samples were collected every three months during the period of winter 2009 to summer 2010. Samples were collected in thirteen points along of the dam, as follows: Rio dos Porcos (Point 1), Summit Control (Point 2), Ilha do Bigua (Point 3), Casa Caida (Point 4), Barragem (Point 5), Foz de Taquacetuba (Point 6), Braco Borore (Point 7), Foz de Borore (Point 8), Alvarenga (Point 9), Pedreira (Point 10), Borore's Margin (Point 11), Capivari I's Margin (Point 12) and Capivari II's Margin (Point 13). The determination of Al, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb and Zn was performed by using high resolution inductively coupled plasma mass spectrometer (HR-ICPMS). The methodology has been validated using certified reference material Riverine Water Reference Material for Trace Metals provided by National Research Council Canada (NRCC). The sampling points located in the Pedreira, Borore's Margin, Alvarenga, Barragem Taquacetuba, Casa Caida e Ilha do Bigua presented the highest concentrations. The level for Fe, Cu and Ni were higher than the ones reported in the literature and above the limit set by CONAMA 2914/201. (author)

  18. Economics of reservoir sedimentation and sustainable management of dams.

    Science.gov (United States)

    Palmieri, A; Shah, F; Dinar, A

    2001-02-01

    Accepted practice has been to design and operate reservoirs to fill with sediment, generating benefits from remaining storage over a finite period of time. The consequences of sedimentation and project abandonment are left to the future. This 'future' has already arrived for many existing reservoirs and most others will eventually experience a similar fate, thereby imposing substantial costs on society. Such costs could be avoided if sedimentation was minimized and dams were allowed to live forever. The fact that the world's inventory of suitable reservoir sites is limited provides an additional reason for encouraging the sustainable management of dams. This paper provides a framework for assessing the economic feasibility of sediment management strategies that would allow the life of dams to be prolonged indefinitely. Even if reduced accumulation or removal of sediment is technically possible, its economic viability is likely to depend on physical, hydrological and financial parameters. The model presented incorporates such factors and allows a characterization of conditions under which sustainable management would be desirable. The empirical implementation of the model draws upon the substantial amount of technical information available. We analyze the sustainability of reservoirs, with a focus on the trade-off between such sustainability and the short to medium term benefits which a reservoir is expected to produce. The results show that, for a very wide range of realistic parameter values, sustainable management of reservoirs is economically more desirable than the prevailing practice of forcing a finite reservoir life through excessive sediment accumulation.

  19. A pre-dam-removal assessment of sediment transport for four dams on the Kalamazoo River between Plainwell and Allegan, Michigan

    Science.gov (United States)

    Syed, Atiq U.; Bennett, James P.; Rachol, Cynthia M.

    2005-01-01

    Four dams on the Kalamazoo River between the cities of Plainwell and Allegan, Mich., are in varying states of disrepair. The Michigan Department of Environmental Quality (MDEQ) and U.S. Environmental Protection Agency (USEPA) are considering removing these dams to restore the river channels to pre-dam conditions. This study was initiated to identify sediment characteristics, monitor sediment transport, and predict sediment resuspension and deposition under varying hydraulic conditions. The mathematical model SEDMOD was used to simulate streamflow and sediment transport using three modeling scenarios: (1) sediment transport simulations for 730 days (Jan. 2001 to Dec. 2002), with existing dam structures, (2) sediment transport simulations based on flows from the 1947 flood at the Kalamazoo River with existing dam structures, and (3) sediment transport simulations based on flows from the 1947 flood at the Kalamazoo River with dams removed. Sediment transport simulations based on the 1947 flood hydrograph provide an estimate of sediment transport rates under maximum flow conditions. These scenarios can be used as an assessment of the sediment load that may erode from the study reach at this flow magnitude during a dam failure. The model was calibrated using suspended sediment as a calibration parameter and root mean squared error (RMSE) as an objective function. Analyses of the calibrated model show a slight bias in the model results at flows higher than 75 m3/s; this means that the model-simulated suspended-sediment transport rates are higher than the observed rates; however, the overall calibrated model results show close agreement between simulated and measured values of suspended sediment. Simulation results show that the Kalamazoo River sediment transport mechanism is in a dynamic equilibrium state. Model results during the 730-day simulations indicate significant sediment erosion from the study reach at flow rates higher than 55 m3/s. Similarly, significant

  20. Dams. Bulletin of the Technical Service of Electric Power and Big Dams; Barrages. Bulletin du Service Technique de l`Energie Electrique et des Grands Barrages

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-12-31

    Four papers were selected in this issue of the bulletin of the Technical Service of Electric Power and Big Dams. The first one concerns the `Catastrophe Medicine` congress which took place in Amiens (France) in December 5 to 7 1996 and during which the analysis of experience feedbacks and lessons gained after dam accidents and organisation of emergency plans was discussed. The second one is a report of the conclusions of the decennial and annual inspections of French dams. The third paper describes the reinforcement of the Lavaud-Gelade dam embankment and the last paper reports on the Control Services activities concerning the French dams in operation for the forth quarter of the year 1996. (J.S.)

  1. Small-Scale Hydroelectric Power Demonstration Project. Pennsylvania Hydroelectric Development Corporation Flat Rock Dam: Project summary report

    Energy Technology Data Exchange (ETDEWEB)

    Gleeson, L.

    1991-12-01

    The US Department of Energy Field Office, Idaho, Small-Scale Hydroelectric Power Program was initiated in conjunction with the restoration of three power generating plants in Idaho Falls, Idaho, following damage caused by the Teton Dam failure on June 5, 1976. There were many parties interested in this project, including the state and environmental groups, with different concerns. This report was prepared by the developer and describes the design alternatives the applicant provided in an attempt to secure the Federal Energy Regulatory Commission license. Also included are correspondence between the related parties concerning the project, major design alternatives/project plan diagrams, the license, and energy and project economics.

  2. Libby/Hungry Horse Dams Wildlife Mitigation Habitat Protection : Interim Report.

    Energy Technology Data Exchange (ETDEWEB)

    Wood, Marilyn

    1991-04-01

    The Columbia River Basin Fish and Wildlife Program identified mitigation goals for Hungry Horse and Libby dams (1987). Specific programs goals included: (1) protect and/or enhance 4565 acres of wetland habitat in the Flathead Valley; (2) protect 2462 acres of prairie habitat within the vicinity of the Tobacco Plains Columbian sharp-tailed grouse; (3) protect 8590 acres riparian habitat in northwest Montana for grizzly and black bears; and (4) protect 11,500 acres of terrestrial furbearer habitat through cooperative agreements with state and federal agencies and private landowners. The purpose of this project is to continue to develop and obtain information necessary to evaluate and implement specific wildlife habitat protection actions in northwestern Montana. This report summarizes project work completed between May 1, 1990, and December 31, 1990. There were three primary project objectives during this time: obtain specific information necessary to develop the mitigation program for Columbian sharp-tailed grouse; continue efforts necessary to develop, refine, and coordinate the mitigation programs for waterfowl/wetlands and grizzly/black bears; determine the opportunity and appropriate strategies for protecting terrestrial furbearer habitat by lease or management agreements on state, federal and private lands. 19 refs., 1 tab.

  3. Effects of three high-flow experiments on the Colorado River ecosystem downstream from Glen Canyon Dam, Arizona

    Science.gov (United States)

    Melis, Theodore S.

    2011-01-01

    Three high-flow experiments (HFEs) were conducted by the U.S. Department of the Interior at Glen Canyon Dam, Arizona, in March 1996, November 2004, and March 2008. These experiments, also known as artificial or controlled floods, were large-volume, scheduled releases of water from Glen Canyon Dam that were designed to mimic some aspects of pre-dam Colorado River seasonal flooding. The goal of these experiments was to determine whether high flows could be used to benefit important physical and biological resources in Glen Canyon National Recreation Area and Grand Canyon National Park that had been affected by the operation of Glen Canyon Dam. Efforts such as HFEs that seek to maintain and restore downstream resources are undertaken by the U.S. Department of the Interior under the auspices of the Grand Canyon Protection Act of 1992 (GCPA; title XVIII, secs. 1801-1809, of Public Law 102-575). Scientists conducted a wide range of monitoring and research activities before, during, and after the experiments. Initially, research efforts focused on whether HFEs could be used to rebuild and maintain Grand Canyon sandbars, which provide camping beaches for hikers and whitewater rafters, create habitats potentially used by native fish and other wildlife, and are the source of windborne sand that may help to protect some archaeological resources from weathering and erosion. As scientists gained a better understanding of how HFEs affect the physical environment, research efforts expanded to include additional investigations about the effects of HFEs on biological resources, such as native fishes, nonnative sports fishes, riverside vegetation, and the aquatic food web. The chapters that follow summarize and synthesize for decisionmakers and the public what has been learned about HFEs to provide a framework for implementing similar future experiments. This report is a product of the Glen Canyon Dam Adaptive Management Program (GCDAMP), a Federal initiative authorized to ensure

  4. Construction of a Dry Ash Dam with Soilbags and Slope Stability Analysis

    Science.gov (United States)

    Li, Hui; Song, Yingjun; Gao, Jiaorong; Li, Longhua; Zhou, Yuqi; Qi, Hui

    2017-12-01

    In thermal power plants, it is necessary to build ash dams to store fly ash, which is the by-product after the combustion of coals. To solve the problem of lacking rockfill materials in Africa, A new technology of constructing ash dams using solibags filled with local sands is proposed and the method of analyzing its slope stability is suggested. The design of the ash dam using soilbags in Lamb Thermal Power Plant of Kenya is introduced in detail. The slope stability of the soilbags-constructed ash dam was analyzed by adopting the suggested method. The results show that the soilbags filled with ash or sands have high compressive strength, and the primary dam constructed with soilbags can effectively retain the backfill ash and the stacking dam reinforced with soilbags can stand stable even with the slope of 1:1.5.

  5. Effects of Contraction Joints on Vibrational Characteristics of Arch Dams: Experimental Study

    Directory of Open Access Journals (Sweden)

    S. S. Wang

    2015-01-01

    Full Text Available This study experimentally investigates the effects of contraction joints on the vibrational characteristics of high arch dams. Three scale models of the world’s second highest dam, the Xiaowan Arch Dam, are used as experimental specimens identified by zero, one, and two contraction joints. When a scale model vibrates harmonically at a specific frequency, its operating deflection shape is acquired by using a scanning laser vibrometer to scan the side surface of the model. The effects of contraction joints on the vibrational characteristics of arch dams are studied by examining the changes in operating deflection shapes. Experimental results demonstrate that (i contraction joints can significantly affect the vibrational characteristics of arch dams, (ii the operating deflection shape intuitively illustrates the vibrational characteristics of arch dams, and (iii a scanning laser vibrometer has marked advantages over traditional equipment in accurately and efficiently acquiring full-field dynamic responses of a structure.

  6. Special presentation : lessons learned for dams from the 2008 Wenchuan, China M8 earthquake

    Energy Technology Data Exchange (ETDEWEB)

    Charlwood, R. [Robin Charlwood and Associates, Edmonds, WA (United States); ICOLD Committee on Concrete Dams, Denver, CO (United States); Schubak, B. [BC Hydro, Burnaby, BC (Canada)

    2009-07-01

    The Chinese National Committee on Large Dams (CHINCOLD) hosted an International Seminar on Earthquakes and Dam Safety in Chengdu, China from March 29 to April 3, 2009. The authors of this special presentation participated at the seminar as part of a mission of the International Committee on Large Dams (ICOLD) to discuss the impacts of the 8.5 magnitude Wenchuan earthquake at Zipingpu, Futang, Shapai and Yingxiuwan projects. The seminar included site visits and addressed topical issues regarding dam engineering, with particular reference to safety and the performance of new and existing dams. Reports on Bikou and Bao Zhusi projects were presented along with management issues of the Tongjiashan landslide dam. This presentation discussed the key lessons learned at each project.

  7. Compliance Monitoring of Juvenile Subyearling Chinook Salmon Survival and Passage at The Dalles Dam, Summer 2010

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Carlson, Thomas J.; Skalski, John R.

    2010-12-21

    The purpose of this compliance study was to estimate dam passage survival of subyearling Chinook salmon smolts at The Dalles Dam during summer 2010. Under the 2008 Federal Columbia River Power System (FCRPS) Biological Opinion (BiOp), dam passage survival should be greater than or equal to 0.93 and estimated with a standard error (SE) less than or equal 0.015. The study also estimated smolt passage survival from the forebay 2 km upstream of the dam to the tailrace 2 km below the dam The forebay-to-tailrace survival estimate satisfies the “BRZ-to-BRZ” survival estimate called for in the Fish Accords. , as well as the forebay residence time, tailrace egress time, and spill passage efficiency, as required in the Columbia Basin Fish Accords. The estimate of dam survival for subyearling Chinook salmon at The Dalles in 2010 was 0.9404 with an associated standard error of 0.0091.

  8. Effects of Hypergravity Exposure On Plasma Oxytocin Concentrations In Pregnant and Lactating Rat Dams

    Science.gov (United States)

    Baer, Lisa A.; Wade, Charles E.; Ronca, April E.; Dalton, Bonnie (Technical Monitor)

    2002-01-01

    Rat dams and offspring were exposed to 1.5-g, 1.75-g or 2.0-g hypergravity (hg) from Gestational day (G) 11 until Postnatal day (P) 10. To ascertain the role of maternal factors in reduced postnatal body weights of offspring developed in hg, the dams' lactational hormones were measured. Oxytocin (OT), the major hormone responsible for milk ejection, was reduced in hg dams whereas prolactin (Prl), involved in milk production, was unchanged. Video analyses of nursing behavior revealed that hg dams spent more time nursing relative to 1-g controls. We hypothesized impaired milk transfer from dam to pup, however pup body weight gains following a discrete suckling episode were comparable across conditions. Changes in lactational hormones and nursing behavior by dams exposed to hg do not account for reduced body masses of their offspring.

  9. Impact of beaver dams on abundance and distribution of anadromous salmonids in two lowland streams in Lithuania.

    Directory of Open Access Journals (Sweden)

    Tomas Virbickas

    Full Text Available European beaver dams impeded movements of anadromous salmonids as it was established by fishing survey, fish tagging and redd counts in two lowland streams in Lithuania. Significant differences in abundancies of other litophilic fish species and evenness of representation by species in the community were detected upstream and downstream of the beaver dams. Sea trout parr marked with RFID tags passed through several successive beaver dams in upstream direction, but no tagged fish were detected above the uppermost dam. Increase in abundances of salmonid parr in the stream between the beaver dams and decrease below the dams were recorded in November, at the time of spawning of Atlantic salmon and sea trout, but no significant changes were detected in the sections upstream of the dams. After construction of several additional beaver dams in the downstream sections of the studied streams, abundance of Atlantic salmon parr downstream of the dams decreased considerably in comparison with that estimated before construction.

  10. Free flow spillways on loam dams; Deversoirs a ecoulement libre sur des digues en terre

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-31

    The free flow spillways technique was developed abroad and has been used and developed in France by two research offices and foremen. Dams of this type can have heights of 8 to 20 m and both dams and spillways must fit with special technical characteristics which are described (drainage, joints, reinforcements, wall surface, embankment etc..). The experience of French foremen with this type of dams and spillways is reported. (J.S.)

  11. Stability analysis of concrete gravity dam on complicated foundation with multiple slide planes

    OpenAIRE

    Ren Xuhua; Shu Jiaqing; Ben Nenghui; Ren Hongyun

    2008-01-01

    A key problem in gravity dam design is providing enough stability to prevent slide, and the difficulty increases if there are several weak structural planes in the dam foundation. Overload and material weakening were taken into account, and a finite difference strength reserve method with partial safety factors based on the reliability method was developed and used to study the anti-slide stability of a concrete gravity dam on a complicated foundation with multiple slide planes. Possible slid...

  12. Linking the “Internet of Things” to social media: a look at the Vaal Dam

    CSIR Research Space (South Africa)

    Butgereit, LL

    2011-09-01

    Full Text Available source books, and Google Scholar for other scholarly articles. This additional information was randomly appended to the tweets and status updates about the Vaal Dam to provide additional information to the the Vaal Dam's followers and friends. 4...: YouTube Google News Google Scholar CSIR Research Space Google Books Flickr Google Images This information was appended to the actual capacity status to provide the followers and friends more information about the Vaal Dam. 5. Social media...

  13. Importance of using roller compacted concrete in techno-economic investigation and design of small dams

    Science.gov (United States)

    Rouissat, Bouchrit; Smail, N.; Zenagui, S.

    2017-12-01

    In recent years, and under constraints caused by persistent drought, Algeria has launched a new mobilization strategy for surface water resources from small and medium dams. However, by making a review of the studies and achievements of twenty small dams in the west of Algeria, some deficiencies appeared. In addition to reservoir siltation assessment, operation spillways have been the major constraint on the reliability of these types of dams. The objective of this paper is to use the roller compacted concrete (RCC) for small dams' design for the benefit it offers and its ability to incorporate spillways. The development of this reflection was applied to the Khneg Azir earth dam situated in southwest of Algeria. Its uncontrolled lateral spillway has registered significant damage following the flood of October 2005, amounted, at that time, to more than 100 million Algerian dinars (1 million US Dollars). The present research encompasses a technical and economical comparative analysis concerning multiple criteria dam design types coupled with the conjugation of the spillways. Thus, on the basis of financial estimates calculated for all design types, the variant RCC remains competitive with that of the earth dam's spillway isolated (Less than 40% of the cost). To assess the mechanical behavior of the foundations for both types of dams, (earth and RCC dams), numerical modeling has been undertaken, according to the comparative analysis of deformations in the foundations. Analysis of deformations showed that the average foundation deformations was between (0.052-0.85) m for earth dam and (0.023-0.373) m for RCC dam. These economical and technical considerations open up important prospects for the use of RCC in the design of small dams.

  14. Impact of dams on flood occurrence of selected rivers in the United States

    Science.gov (United States)

    Mei, Xuefei; Van Gelder, P. H. A. J. M.; Dai, Zhijun; Tang, Zhenghong

    2016-10-01

    A significant large number of dams have been constructed in the past two centuries in the United States. These dams' ability to regulate downstream flooding has received world-wide attention. In this study, data from 38 rivers distributed over the entire conterminous Untied States with extensive pre- and post-dam annual peak discharge records, were collected to research the impacts of various dams on the flood behaviors at a national scale. The results indicate that dams have led to significant reductions in flood magnitude for nearly all of the sites; the decrease rate in the mean of annual peak discharge varies between 7.4% and 95.14%, except for the Dead River, which increased by 1.46%. Because of dams' effectiveness, the probability density curve of annual peak flow changes from a flat to peaked shape because both the range and magnitude of high discharges are decreased. Moreover, the potential impact of dams on flood characteristics were closely related to the dam's geographic location and function, the ratio of the storage capacity of the dam to the mean annual runoff of the river (C/R), and the ratio of reservoir storage capacity to the area of its drainage (C/D). Specifically, the effects of dams on annual peak flows were more related to latitude than longitude. Compared with dams built for other purposes, the dam exclusively used for flood management cut off more flood peaks. Increases in the ratios of C/R and C/D increased the degree of modification of annual maximum discharge.

  15. Damming Trans-boundary Rivers: A Welfare Analysis of Conflict and Cooperation

    OpenAIRE

    Zeng, Yuyu; Houba, Harold; Dinar, Ariel; Marence, Miroslav

    2016-01-01

    Dams are essential for water storage and hydropower generation, but change river flow patterns and endanger local environments. Dam projects may further exacerbate already existing problems in trans-boundary rivers. We consider three scenarios of institutional factors: (1) each country pursues its own interests, (2) efficient cooperation along the river and (3) partial cooperation among neighboring countries. We conduct cost-benefit analyses for these scenarios incorporating dam projects and ...

  16. Importance of using roller compacted concrete in techno-economic investigation and design of small dams

    Science.gov (United States)

    Rouissat, Bouchrit; Smail, N.; Zenagui, S.

    2017-07-01

    In recent years, and under constraints caused by persistent drought, Algeria has launched a new mobilization strategy for surface water resources from small and medium dams. However, by making a review of the studies and achievements of twenty small dams in the west of Algeria, some deficiencies appeared. In addition to reservoir siltation assessment, operation spillways have been the major constraint on the reliability of these types of dams. The objective of this paper is to use the roller compacted concrete (RCC) for small dams' design for the benefit it offers and its ability to incorporate spillways. The development of this reflection was applied to the Khneg Azir earth dam situated in southwest of Algeria. Its uncontrolled lateral spillway has registered significant damage following the flood of October 2005, amounted, at that time, to more than 100 million Algerian dinars (1 million US Dollars). The present research encompasses a technical and economical comparative analysis concerning multiple criteria dam design types coupled with the conjugation of the spillways. Thus, on the basis of financial estimates calculated for all design types, the variant RCC remains competitive with that of the earth dam's spillway isolated (Less than 40% of the cost). To assess the mechanical behavior of the foundations for both types of dams, (earth and RCC dams), numerical modeling has been undertaken, according to the comparative analysis of deformations in the foundations. Analysis of deformations showed that the average foundation deformations was between (0.052-0.85) m for earth dam and (0.023-0.373) m for RCC dam. These economical and technical considerations open up important prospects for the use of RCC in the design of small dams.

  17. Evolution of glacier-dammed lakes through space and time; Brady Glacier, Alaska, USA

    OpenAIRE

    Capps, Denny McLane

    2011-01-01

    Glacier-dammed lakes and their associated jökulhlaups cause severe flooding in downstream areas and substantially influence glacier dynamics. The goal of this dissertation is to identify and characterize the evolution of glacier-dammed lakes to predict their future behaviour using ground-truthed remote sensing techniques and dendrochronology. Brady Glacier in southeast Alaska is particularly well suited for a study of these phenomena because it presently dams ten large (>1 square km) lakes...

  18. Reducing risks in the investigation, design and construction of large concrete dams

    OpenAIRE

    Brown, E.T.

    2016-01-01

    An overview of the GeoSafe 2016 Symposium topic is provided using the example of large concrete dams for purposes of illustration. It is essential that the risks associated with large dams be evaluated rigorously and managed proactively at all stages of their lives so that the risk of failure remains As Low As Reasonably Practicable (ALARP). Rock engineering features of large concrete dams that require particular attention, assessment and monitoring during the investigation, design, construct...

  19. The Limits of Social Protection: The Case of Hydropower Dams and Indigenous Peoples' Land

    OpenAIRE

    Cooke, Majid Fadzilah; Nordensvard, Johan; Saat, Bin Gusni; Urban, Frauke; Siciliano, Giuseppina

    2017-01-01

    Hydropower dams have been criticized for their social and environmental implications. There have been attempts to create international social standards for hydropower dam projects but these standards have had limited impact. This article uses an extended environmental justice framework to make sense of the resettlement and compensation schemes for Indigenous peoples who were resettled for the construction of the Bakun dam in Borneo, East Malaysia. The article therefore analyses the social pro...

  20. Experimental Study on Impact Load on a Dam Due to Debris Flow

    Science.gov (United States)

    lwao Miyoshi

    1991-01-01

    When a dam is struck by mud or debris flow, it is put under a great impact load and sometimes is destroyed. To prevent such destruction, it is important to perform basic research about the impact load on a dam due to debris flow. Thus, we have made an experimental study and tried to establish a method to estimate such a impact load on the dam. The experiment was...

  1. Monitoring Thermal Pollution in Rivers Downstream of Dams with Landsat ETM+ Thermal Infrared Images

    Directory of Open Access Journals (Sweden)

    Feng Ling

    2017-11-01

    Full Text Available Dams play a significant role in altering the spatial pattern of temperature in rivers and contribute to thermal pollution, which greatly affects the river aquatic ecosystems. Understanding the temporal and spatial variation of thermal pollution caused by dams is important to prevent or mitigate its harmful effect. Assessments based on in-situ measurements are often limited in practice because of the inaccessibility of water temperature records and the scarcity of gauges along rivers. By contrast, thermal infrared remote sensing provides an alternative approach to monitor thermal pollution downstream of dams in large rivers, because it can cover a large area and observe the same zone repeatedly. In this study, Landsat Enhanced Thematic Mapper Plus (ETM+ thermal infrared imagery were applied to assess the thermal pollution caused by two dams, the Geheyan Dam and the Gaobazhou Dam, located on the Qingjiang River, a tributary of the Yangtze River downstream of the Three Gorges Reservoir in Central China. The spatial and temporal characteristics of thermal pollution were analyzed with water temperatures estimated from 54 cloud-free Landsat ETM+ scenes acquired in the period from 2000 to 2014. The results show that water temperatures downstream of both dams are much cooler than those upstream of both dams in summer, and the water temperature remains stable along the river in winter, showing evident characteristic of the thermal pollution caused by dams. The area affected by the Geheyan Dam reaches beyond 20 km along the downstream river, and that affected by the Gaobazhou Dam extends beyond the point where the Qingjiang River enters the Yangtze River. Considering the long time series and global coverage of Landsat ETM+ imagery, the proposed technique in the current study provides a promising method for globally monitoring the thermal pollution caused by dams in large rivers.

  2. Army Corps of Engineers: Actions Needed to Improve Cost Sharing for Dam Safety Repairs

    Science.gov (United States)

    2015-12-01

    earthquake and fault rupture • Embankment erosion through seepage Main dam: • Raise dam by 16 feet along 2,000-foot embankment Auxiliary dam...implications given that mitigating the effects of seepage, as evidenced by our review, is a common reason for making safety- related repairs. In recent...also assert that the state- of-the-art provision applies to projects that mitigate the effects of seepage. For example, the Corps determined that

  3. Expressional regulation of PpDAM5 and PpDAM6, peach (Prunus persica) dormancy-associated MADS-box genes, by low temperature and dormancy-breaking reagent treatment

    OpenAIRE

    Yamane, Hisayo; Ooka, Tomomi; Jotatsu, Hiroaki; Hosaka, Yukari; Sasaki, Ryuta; Tao, Ryutaro

    2011-01-01

    The present study investigated the expressional regulation of PpDAM5 and PpDAM6, two of the six peach (Prunus persica) dormancy-associated MADS-box genes, in relation to lateral bud endodormancy. PpDAM5 and PpDAM6 were originally identified as homologues of Arabidopsis SHORT VEGETATIVE PHASE/AGAMOUS-LIKE 24 identified in the EVERGROWING locus of peach. Furthermore, PpDAM5 and PpDAM6 have recently been suggested to be involved in terminal bud dormancy. In this study, seasonal expression analys...

  4. Simulating daily water temperatures of the Klamath River under dam removal and climate change scenarios

    Science.gov (United States)

    Perry, Russell W.; Risley, John C.; Brewer, Scott J.; Jones, Edward C.; Rondorf, Dennis W.

    2011-01-01

    A one-dimensional daily averaged water temperature model was used to simulate Klamath River temperatures for two management alternatives under historical climate conditions and six future climate scenarios. The analysis was conducted for the Secretarial Determination on removal of four hydroelectric dams on the Klamath River. In 2012, the Secretary of the Interior will determine if dam removal and implementation of the Klamath Basin Restoration Agreement (KBRA) (Klamath Basin Restoration Agreement, 2010) will advance restoration of salmonid fisheries and is in the public interest. If the Secretary decides dam removal is appropriate, then the four dams are scheduled for removal in 2020.

  5. An assessment of rubber dam usage amongst specialists in paediatric dentistry practising within the UK.

    Science.gov (United States)

    Soldani, Francesca; Foley, Jennifer

    2007-01-01

    Rubber dam is recommended by the British Society of Paediatric Dentistry (BSPD) for various restorative and endodontic procedures. To date, there has been no report of actual usage of rubber dam within the speciality of paediatric dentistry. The aim of this study was to assess the usage of rubber dam amongst paediatric dentistry specialists within the UK. A postal questionnaire was distributed to all practitioners registered on the UK General Dental Council's 2004 specialist list in paediatric dentistry. Data were available for 162 questionnaires (a 75% response rate), and of these, 85% of respondents worked in the National Health Service (NHS), 4% were private practitioners and the remainder had a mixed NHS/private practice. Regarding the benefits of rubber dam, 65% and 52% of respondents quoted patient safety and moisture control, respectively. Perceived difficulties of dam usage were lack of patient cooperation and the non-necessity for a particular treatment, as quoted in 64% and 36% of the completed questionnaires, respectively. The most common modes of isolation for anterior and posterior teeth were Dry Dam(R) (58%), and clamp and dam (80%), respectively. Current BSPD guidelines recommend rubber dam usage for many restorative procedures; however, it would appear that there is wide variability in the application, as well as under-use, of rubber dam.

  6. Seismic Fortification Analysis of the Guoduo Gravity Dam in Tibet, China

    Directory of Open Access Journals (Sweden)

    Peng Lin

    2015-01-01

    Full Text Available The primary aim of this research was to analyze the seismic performance of the Guoduo gravity dam. A nonlinear FEM method was implemented to study the deformation, stress, and overall stability of dam under both static and dynamic loading conditions, including both normal and overloading conditions. A dam seismic failure risk control method is proposed based on the cracking mechanism induced by the dynamic load to ensure dam safety and stability. Numerical simulation revealed that (1 under normal static and dynamic loading the symmetry of the displacement distributions is good, showing that the dam abutments and riverbed foundation have good overall stiffness. The stress distribution is a safe one for operation under both normal water loading and seismic loading. (2 Attention should be paid to the reinforcement design of outlets of the diversion dam monoliths, and enhance the capability of sustaining that tensile stress of dam monoliths. (3 The shape of the dam profile has a significant effect on the dynamic response of the dam. (4 By employing the “overload safety factor method,” the overall seismic fortification is as follows: K1=1.5, K2= 2~3, and K3= 3~4.

  7. Reinvestigation of the Dynamic Tidal Power Dams and their Influences on Hydrodynamic Environment

    Science.gov (United States)

    Shao, Dong; Feng, Weibing; Feng, Xi; Xu, Yinfeng

    2017-05-01

    Dynamic tidal power (DTP) system is known as an efficient method to exploit the tidal power. Large storage of tidal power in the Yellow Sea and the Bohai Sea along the Chinese coastline is revealed by previous studies. In the consideration of the local environment, combination of smaller DTP dams located at three attractive positions in this area is investigated. Their efficiency is compared with that of larger DTP dams working singly. The influences of the triple smaller dams are also discussed together with those of the single larger dams placed at the same locations.

  8. Status and trends of dam removal research in the United States

    Science.gov (United States)

    Bellmore, James; Duda, Jeff; Craig, Laura; Greene, Samantha L.; Torgersen, Christian; Collins, Mathias J.; Vittum, Katherine

    2017-01-01

    Aging infrastructure coupled with growing interest in river restoration has driven a dramatic increase in the practice of dam removal. With this increase, there has been a proliferation of studies that assess the physical and ecological responses of rivers to these removals. As more dams are considered for removal, scientific information from these dam-removal studies will increasingly be called upon to inform decisions about whether, and how best, to bring down dams. This raises a critical question: what is the current state of dam-removal science in the United States? To explore the status, trends, and characteristics of dam-removal research in the U.S., we searched the scientific literature and extracted basic information from studies on dam removal. Our literature review illustrates that although over 1200 dams have been removed in the U.S., fewer than 10% have been scientifically evaluated, and most of these studies were short in duration ( physical and ecological components. Our review illustrates the need for long-term, multidisciplinary case studies, with robust study designs, in order to anticipate the effects of dam removal and inform future decision making.

  9. Viewpoint – Principles in Practice: Updating the Global Multi-Stakeholder Dialogue on Dams in 2010

    Directory of Open Access Journals (Sweden)

    D. Mark Smith

    2010-06-01

    The WCD recommendations were not embraced by all stakeholders, and it is increasingly clear that the drivers for dam development and the actors involved are changing, because of for example climate change and the emergence of China as a major international financier of dams. It may be time therefore to renew efforts to expand consensus on dams and re-galvanise the global multi-stakeholder dialogue that was started by the WCD. Otherwise, the 21st century dams industry will run into the same risks – fuelled by issues of equity, environment and dissatisfaction with development outcomes achieved – that brought their counterparts into the WCD in 1998.

  10. Optimization design of foundation excavation for Xiluodu super-high arch dam in China

    Directory of Open Access Journals (Sweden)

    Qixiang Fan

    2015-04-01

    Full Text Available With better understanding of the quality and physico-mechanical properties of rocks of dam foundation, and the physico-mechanical properties and structure design of arch dam in association with the foundation excavation of Xiluodu arch dam, the excavation optimization design was proposed for the foundation surface on the basis of feasibility study. Common analysis and numerical analysis results demonstrated the feasibility of using the weakly weathered rocks III1 and III2 as the foundation surface of super-high arch dam. In view of changes in the geological conditions at the dam foundation along the riverbed direction, the design of extending foundation surface excavation area and using consolidating grouting and optimizing structure of dam bottom was introduced, allowing for harmonization of the arch dam and foundation. Three-dimensional (3D geomechanics model test and finite element analysis results indicated that the dam body and foundation have good overload stability and high bearing capacity. The monitoring data showed that the behaviors of dam and foundation correspond with the designed patterns in the construction period and the initial operation period.

  11. Regional energy markets and the cost of natural flow dam operation

    Energy Technology Data Exchange (ETDEWEB)

    Sparrow, F.T.; Preckel, P.V.; Gotham, D.J. [Purdue University, Energy Center at Discovery Park, West Lafayette, IN (United States); Bowen, B.H. [American University in Kosovo, Pristina (RS); Yu, Z. [EmberClear, Inc., Houston, TX (United States)

    2011-11-15

    With the proliferation of electricity markets for the purchase and sale of firm and non-firm power and capacity, the possibility exists for using trade in these commodities to minimize the cost impact of operating dams to restore downstream flows to pre-dam patterns - so called Run of River (ROR) dam operation. We examine the impact of such markets on the incremental costs of ROR operation relative to least cost operation via a stochastic, dynamic optimization model. We identify features of the dam structure and of the economic environment that are critical to achieving ROR operation at modest incremental cost. (orig.)

  12. Viewpoint – The World Bank Versus the World Commission on Dams

    Directory of Open Access Journals (Sweden)

    Robert Goodland

    2010-06-01

    Full Text Available The World Bank Group (WBG has long resisted guidelines from reformers and the World Commission on Dams (WCD requiring large dam projects to internalise the social and environmental costs of dam construction. Despite some progress, the Bank continues to resist calls for it to eschew countries’ use of violence in removing residents from areas to be flooded by reservoirs, compensate residents adequately for their losses, or involve affected people in planning for big dams. Suggestions are made for more humane and economically responsible Bank policies.

  13. Turbid releases from Glen Canyon Dam, Arizona, following rainfall-runoff events of September 2013

    Science.gov (United States)

    Wildman, Richard A.; Vernieu, William

    2017-01-01

    Glen Canyon Dam is a large dam on the Colorado River in Arizona. In September 2013, it released turbid water following intense thunderstorms in the surrounding area. Turbidity was >15 nephelometric turbidity units (NTU) for multiple days and >30 NTU at its peak. These unprecedented turbid releases impaired downstream fishing activity and motivated a rapid-response field excursion. At 5 locations upstream from the dam, temperature, specific conductance, dissolved oxygen, chlorophyll a, and turbidity were measured in vertical profiles. Local streamflow and rainfall records were retrieved, and turbidity and specific conductance data in dam releases were evaluated. Profiling was conducted to determine possible sources of turbidity from 3 tributaries nearest the dam, Navajo, Antelope, and Wahweap creeks, which entered Lake Powell as interflows during this study. We discuss 4 key conditions that must have been met for tributaries to influence turbidity of dam releases: tributary flows must have reached the dam, tributary flows must have been laden with sediment, inflow currents must have been near the depth of dam withdrawals, and the settling velocity of particles must have been slow. We isolate 2 key uncertainties that reservoir managers should resolve in future similar studies: the reach of tributary water into the reservoir thalweg and the distribution of particle size of suspended sediment. These uncertainties leave the source of the turbidity ambiguous, although an important role for Wahweap Creek is possible. The unique combination of limnological factors we describe implies that turbid releases at Glen Canyon Dam will continue to be rare.

  14. Skyscraper dams in Yunnan : China's new electricity generator should step in

    Energy Technology Data Exchange (ETDEWEB)

    Ryder, G.

    2006-05-12

    The construction of a series of high-head hydroelectric power dams in China's earthquake-prone Yunnan province has raised concerns in China's scientific and environmental communities. The series of skyscraper-high dams are being built to meet Beijing's power production targets without the benefit of market discipline or effective regulatory oversight. Dam building is central to Beijing's plan for tripling the country's hydropower production by 2020. To meet that target, the State Council granted exclusive development rights to Hydrolancang, the Yunnan Huadian Nu River Hydropower Development Company and the Three Gorges Corporation. The Hydrolancang company is building 2 of the world's tallest and most controversial hydro dams on the Lancang River. When completed in 2012, Xiaowan will be the world's tallest arch dam at 292 metres high. Another dam, the 254 metre high Nuozhadu dam is expected to start generating power in 2017. In addition, there are plans for 13 other high dams along the Nu River, one of only 2 major rivers in China that remains free-flowing. This document expressed that China's new electricity regulator should initiate a full-cost review of state dam-building in the earthquake-prone province. It was argued that as state-owned power companies, the dam builders are not market-driven and are shielded from many of the financial risks and environmental liabilities associated with large dams. The author argued that China's electricity regulator should examine the dam builders' projects costs and profits and review the economic implications of the hydro policy for China's power consumers. It was also suggested that the country's modernization goals for the power industry should be reviewed. The immediate concerns are ecological damage and the frequency with which Yunnan province is hit by earthquakes, rock falls and landslides. Experts caution that the extra weight of the high dams and reservoirs

  15. Destabilization of Masjed-Soleyman rockfill dam observed by satellite radar interferometry

    Science.gov (United States)

    Haghshenas Haghighi, Mahmud; Motagh, Mahdi; Emadali, Lotfollah

    2017-04-01

    Differential interferometry using Envisat, ALOS, ALOS-2, TerraSAR-X and Sentinel-1 data, and terrestrial geodetic surveys are used to assess post-construction settlement of the Masjed-Soleyman embankment dam, southwest Iran. The Masjed-Soleyman dam, a rockfill dam with a vertical central clay core, was constructed between 1995 and 2000 on the Karoun River, which is one of the largest and longest rivers in Iran (length 950 km) and one of the most important surface water resources in the country. Soon after the first impoundment of the dam in December 2000, cross and longitudinal cracks developed in the dam crest, especially at the junction of concrete or steel elements to the rockfill dam shell, causing growing concern that dam might be at risk of failure. Therefore, geodetic monitoring of Masjed-Soleyman dam became particularly important. In this paper, we report on the detection and analysis of ongoing destabilization of this dam from both space-based synthetic aperture radar (SAR) measurements and ground-based terrestrial survey and evaluate the potential of various space technologies and processing algorithms for efficient monitoring of this infrastructure.

  16. Perspectives on the Salience and Magnitude of Dam Impacts for Hydro Development Scenarios in China

    Directory of Open Access Journals (Sweden)

    Desiree Tullos

    2010-06-01

    Survey results indicate differences in the perceived salience and magnitude of impacts across both expert groups and dam scenarios. Furthermore, surveys indicate that stakeholder perceptions changed as the information provided regarding dam impacts became more specific, suggesting that stakeholder evaluation may be influenced by quality of information. Finally, qualitative comments from the survey reflect some of the challenges of interdisciplinary dam assessment, including cross-disciplinary cooperation, data standardisation and weighting, and the distribution and potential mitigation of impacts. Given the complexity of data and perceptions around dam impacts, decision-support tools that integrate the objective magnitude and perceived salience of impacts are required urgently.

  17. Protection Parameters against the Cracks by the Method of Volume Compensation Dam

    Directory of Open Access Journals (Sweden)

    Bulatov Georgiy

    2016-01-01

    Full Text Available This article provides estimates the parameters of protection from cracking dam due to volume compensation method. This article discusses the method of compensation dam volume. This method allows calculating the settings of security causing cracks the dam. Presents graphs of horizontal deformations of elongation calculated surface along the length of the construction and in time. Showing horizontal stress distribution diagram in the ground around the pile in plan and in section. Given all the necessary formulas for the method of compensation of the dam volume.

  18. VARIANT OF THE CONSTRUCTION OF KATUN (ALTAI HYDROELECTRIC COMPLEX WITH COMBINED DAM

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    Sainov Mikhail Petrovich

    2016-06-01

    Full Text Available The authors give the description of an alternative construction variant of high-head Katun HPP where a reinforced-concrete faced rockfill dam will be the main water retaining structure. At the present moment it is doubtful that at the particular site a high-head complex will be constructed; the discussions are related only to the possibility of a medium-head project construction (to be called Altai HPP. Therefore, it is necessary to design Altai HPP in such a way that its concrete spillway dam will be further able to become a part of a high-head embankment dam. Therefore, we considered the alternative, where Katun HPP dam would be a combined dam by its structure; a high-head em-bankment dam will rest on a less high concrete dam. All the structures were designed for this variant as well as river diversion scheme and the diversion layout at all construction stages were developed. For this purpose “drops in wells” are proposed to be used. The combined dam structure was validated by the stress-strain state analysis under static and seismic loads. In order to improve shear strength of the concrete part of the dam it was proposed to arrange an upstream apron for decreasing seepage uplift.

  19. Remote Sensing of Deformation of a High Concrete-Faced Rockfill Dam Using InSAR: A Study of the Shuibuya Dam, China

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    Wei Zhou

    2016-03-01

    Full Text Available Settlement is one of the most important deformation characteristics of high concrete faced rockfill dams (CFRDs, >100 m. High CFRDs safety would pose a great threat to the security of people’s lives and property downstream if this kind of deformation were not to be measured correctly, as traditional monitoring approaches have limitations in terms of durability, coverage, and efficiency. It has become urgent to develop new monitoring techniques to complement or replace traditional monitoring approaches for monitoring the safety and operation status of high CFRDs. This study examines the Shuibuya Dam (up to 233.5 m in height in China, which is currently the highest CFRD in the world. We used space-borne Interferometric Synthetic Aperture Radar (InSAR time series to monitor the surface deformation of the Shuibuya Dam. Twenty-one ALOS PALSAR images that span the period from 28 February 2007 to 11 March 2011 were used to map the spatial and temporal deformation of the dam. A high correlation of 0.93 between the InSAR and the in-situ monitoring results confirmed the reliability of the InSAR method; the deformation history derived from InSAR is also consistent with the in-situ settlement monitoring system. In addition, the InSAR results allow continuous investigation of dam deformation over a wide area that includes the entire dam surface as well as the surrounding area, offering a clear picture continuously of the dam deformation.

  20. Safety culture assessment and its relationship with the accidents in a dam construction project

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    A. Maleki

    2015-01-01

    Full Text Available Introduction: Safety culture is considered as the core of an organization’s safety management system. Safety culture is an organization ability to achieve higher standards of safety. The aim of this study was to investigate safety culture and its influencing factors and relation to the accident in a dam construction project.  .Material and Method: This cross-sectional study was conducted among 130 workers at a dam construction project. A standardized questionnaire included 59 questions was used to determine the level of safety culture. The accidents occurred in the project during the year were collected based on demographic characteristics. The collected data were analyzed using SPSS version 19.  .Result: The mean age of the subjects, their work experience and score of safety culture were 35.05, 7.5 Years and 183.2, respectively. Twenty seven accidents were recorded during the year in project. The most common cause of the accidents was indiscretions (33.3%. There was a statistically significant correlation between safety culture to occurred accidents and history of accident (P<0.05. The percentage of a positive safety culture of workers with an experience of accident (71.8% was more than that of those with no experience of accident (45.1%. There was not a statistically significant correlation between safety culture and age, work experience, education, and marital status.  .Conclusion: It seems that safety culture on the project is influenced by the experience of accident and also it was strongly significant with the occurred accidents. Consequently, in order to create a positive safety culture in the workplace many factors including safety education program, work experience and accidents analysis should be considered.