Sample records for tailings dam failure

  1. Reported tailings dam failures

    Microsoft Academic Search

    M. Rico; G. Benito; A. R. Salgueiro; A. D ´ õez-Herrero; H. G. Pereira

    2008-01-01

    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

  2. Floods from tailings dam failures

    Microsoft Academic Search

    M. Rico; G. Benito; A. Díez-Herrero

    2008-01-01

    This paper compiles the available information on historic tailings dam failures with the purpose to establish simple correlations between tailings ponds geometric parameters (e.g., dam height, tailings volume) and the hydraulic characteristics of floods resulting from released tailings. Following the collapse of a mining waste dam, only a part of tailings and polluted water stored at the dam is released,

  3. Safety of Tailings Dams

    NSDL National Science Digital Library

    Contains information on different aspects of tailings dams; tailings dam properties, disasters, failure modes, slurry waves, stability analysis, and safe tailings disposal. Also includes a slope stability calculator and a tailings flow slide calculator.

  4. The tailings dam failures in Maramures county, Romania and their transboundary impacts on the river systems

    Microsoft Academic Search

    Paul A. Brewer; Mark G. Macklin; Dan Balteanu; Tom J. Coulthard; Basarab Driga; Andy J. Howard; Graham Bird; Sorin Zaharia; Mihaela Serban

    \\u000a The tailings dam failures that occurred in January and March 2000 in Maramures County northwest Romania, discharged contaminated\\u000a water and sediment directly into river systems that drain into the Tisa River, a major tributary of the River Danube. To ascertain\\u000a the long-term impacts of these spills, a survey of metal contamination in surface water, river channel and floodplain sediment\\u000a in

  5. River system recovery following the Nova?-Ro?u tailings dam failure, Maramure? County, Romania

    Microsoft Academic Search

    Graham Bird; Paul A. Brewer; Mark G. Macklin; Dan Balteanu; Mihaela Serban; Basarab Driga; Sorin Zaharia

    2008-01-01

    The River Vi?eu catchment in Maramure? County, northwestern Romania, has a long history of base and precious metal mining. Between 1994 and 2003 waste from mining activity at Baia Bor?a was stored in the Nova?-Ro?u tailings pond in the upper Vi?eu catchment. However, in March 2000, the tailings dam failed releasing approximately 100,000m3 of contaminated water and 20,000t of mineral-rich

  6. The long term fate and environmental significance of contaminant metals released by the January and March 2000 mining tailings dam failures in Maramure? County, upper Tisa Basin, Romania

    Microsoft Academic Search

    Mark G. Macklin; Paul A. Brewer; Dan Balteanu; Tom J. Coulthard; Basarab Driga; Andy J. Howard; Sorin Zaharia

    2003-01-01

    In January and March 2000 two tailings dam failures in Maramure? County, northwest Romania, resulted in the release of 200,000 m3 of contaminated water and 40,000 tonnes of tailings into tributaries of the Tisa River, a major tributary of the Danube. The high concentrations of cyanide and contaminant metals released by these dam failures resulted in pollution and fish deaths

  7. Detecting dam failures

    Microsoft Academic Search

    C. M. Knarr; T. J. Barker; S. F. McKenery

    1994-01-01

    This article describes efforts by Southern California Edison to meet Federal Energy Regulatory Commission requirements for unattended dam monitoring against failure. The topics include a description of the two dam systems, monitoring system design and operation including warning sirens for remote camping areas, and installation of the systems.

  8. Detecting dam failures

    SciTech Connect

    Knarr, C.M.; Barker, T.J.; McKenery, S.F. (Southern California Edison Co., Rosemead, CA (United States))

    1994-06-01

    This article describes efforts by Southern California Edison to meet Federal Energy Regulatory Commission requirements for unattended dam monitoring against failure. The topics include a description of the two dam systems, monitoring system design and operation including warning sirens for remote camping areas, and installation of the systems.

  9. Survey of Radionuclide Distributions Resulting from the Church Rock, New Mexico, Uranium Mill Tailings Pond Dam Failure

    SciTech Connect

    Weimer, W. C.; Kinnison, R. R.; Reeves, J. H.

    1981-12-01

    An intensive site survey and on-site analysis program were conducted to evaluate the distribution of four radionucliGes in the general vicinity of Gallup, New Mexico, subsequent to the accidental breach of a uranium mill tailings pond dam and the release of a large quantity of tailings pond materials. The objective of this work was to determine the distribution and concentration levels of {sup 210}Pb, {sup 226}Ra, {sup 230}Th, and {sup 238}U in the arroyo that is immediately adjacent to the uranium tailings pond (pipeline arroyo) and in the Rio Puerco arroyo into which the pipeline arroyo drains. An intensive survey between the United Nuclear Corporation (UNC) Church Rock Mill site and the New Mexico-Arizona state border was performed. Sampling locations were established at approximately 500-ft intervals along the arroyo. During the weeks of September 24 through October 5, 1979, a series of samples was collected from alternate sampling locations along the arroyo. The purpose of this collection of samples and their subsequent analysis was to provide an immediate evaluation of the extent and the levels of radioactive contamination. The data obtained from this extensive survey were then compared to action levels which had been proposed by the Nuclear Regulatory Commission and were adapted by the New Mexico Environmental Improvement Division (NMEID) for {sup 230}Th and {sup 226}Ra concentrations that would require site cleanup. The Pacific Northwest Laboratory/Nuclear Regulatory Commission mobile laboratory van was on-site at the UNC Church Rock Mill from September 22, 1979, through December 13, 1979, and was manned by one or more PNL personnel for all but four weeks of this time period. Approximately 1200 samples associated with the Rio Puerco survey were analyzed 1n the laboratory. An additional 1200 samples related to the Rio Puerco cleanup operations which the United Nuclear Corporation was conducting were analyzed on-site in the mobile laboratory. The purpose of these analyses was to determine the effectiveness of the cleanup operations that were ongoing and to evaluate what additional cleanup would be required. This on-site analysis of radioactive contamination constituted the principal task of this project, with the identification of those portions of the arroyo exceeding the NMEID proposed cleanup criteria being the major output. Additiond1 tasks included an evaluation of the initial soil sampling scheme (letter from T. Wolff [NMEID] to J. Abiss [UNC]. oated September 25, 1979) and the proposed NMEID verification sampling scheme (letter from T. Buhl [NMEID] to H. Miller [NRC]. dated April 23, 1980).

  10. Tailings dam-break flow - Analysis of sediment transport

    NASA Astrophysics Data System (ADS)

    Aleixo, Rui; Altinakar, Mustafa

    2015-04-01

    A common solution to store mining debris is to build tailings dams near the mining site. These dams are usually built with local materials such as mining debris and are more vulnerable than concrete dams (Rico et al. 2008). of The tailings and the pond water generally contain heavy metals and various toxic chemicals used in ore extraction. Thus, the release of tailings due to a dam-break can have severe ecological consequences in the environment. A tailings dam-break has many similarities with a common dam-break flow. It is highly transient and can be severely descructive. However, a significant difference is that the released sediment-water mixture will behave as a non-Newtonian flow. Existing numerical models used to simulate dam-break flows do not represent correctly the non-Newtonian behavior of tailings under a dam-break flow and may lead to unrealistic and incorrect results. The need for experiments to extract both qualitative and quantitative information regarding these flows is therefore real and actual. The present paper explores an existing experimental data base presented in Aleixo et al. (2014a,b) to further characterize the sediment transport under conditions of a severe transient flow and to extract quantitative information regarding sediment flow rate, sediment velocity, sediment-sediment interactions a among others. Different features of the flow are also described and analyzed in detail. The analysis is made by means of imaging techniques such as Particle Image Velocimetry and Particle Tracking Velocimetry that allow extracting not only the velocity field but the Lagrangian description of the sediments as well. An analysis of the results is presented and the limitations of the presented experimental approach are discussed. References Rico, M., Benito, G., Salgueiro, AR, Diez-Herrero, A. and Pereira, H.G. (2008) Reported tailings dam failures: A review of the European incidents in the worldwide context , Journal of Hazardous Materials, 152, 846-852 . Aleixo, R., Ozeren, Y., Altinakar, M. and Wren, D. (2014a) Velocity Measurements using Particle Tracking in Tailings dam Failure experiments, Proceedings of the 3rd IAHR-Europe conference, Porto, Portugal. Aleixo, R., Ozeren, Y., Altinakar, M. (2014b) Tailing dam-break analysis by means of a combined PIV-PTV tool, Proceedings of the River Flow Conference, Lausanne, Switzerland.

  11. FORMATION AND FAILURE OF NATURAL DAMS.

    USGS Publications Warehouse

    Costa, John E.; Schuster, Robert L.

    1988-01-01

    Of the numerous kinds of dams that form by natural processes, dams formed from landslides, glacial ice, and late-neoglacial moraines present the greatest threat to people and property. Landslide dams form a wide range of physiographic settings. The most common types of mass movements that form landslide dams are rock and debris avalanches; rock and soil slumps and slides; and mud, debris, and earth flows. The most common initiation mechanisms for dam-forming landslides are excessive rainfall and snowmelt and earthquakes. Natural dams may cause upstream flooding as the lake rises and downstream flooding as a result of failure of the dam. Although data are few, for the same potential energy at the dam site, downstream flood peaks from the failure of glacier-ice dams are smaller than those from landslide, moraine, and constructed earth-fill and rock-fill dam failures.

  12. The formation and failure of natural dams

    USGS Publications Warehouse

    Costa, J.E.; Schuster, R.L.

    1987-01-01

    Of the numerous kinds of dams that form by natural processes, dams formed from landslides, glacial ice, and neoglacial moraines present the greatest threat to people and property. The most common types of mass movements that form landslide dams are rock and debris avalanches, rock and soil slumps and slides, and mud, debris, and earth flows. The most common initiation mechanisms for dam-forming landslides are excessive rainfall and snowmelt and earthquakes. Landslide dams can be classified into six categories based on their relation with the valley floor. Type I dams (11%) of the 81 landslide dams around the world that were classifed do not reach from one valley side to the other. Type II dams (44%) span the entire valley flood, occasionally depositing material high up on opposite valley sides. Type III dams (41%) move considerable distances both upstream and downstream from the landslide failure. Type IV dams (1%) are rare and involve the contemporaneous failure of material from both sides of a valley. Type V dams (1%) are also rare, and are created when a single landslide sends multiple tongues of debris into a valley forming two or more landslide dams in the same surfaces, that extend under the stream or valley and emerge on the opposite valley side. Many landslide dams fail shortly after formation. Overtopping is by far the most common cause of failure. Glacial ice dams can produce at least nine kinds of ice-dammed lakes. The most dangerous are lakes formed in main valleys dammed by tributary glaciers. Failure can occur by erosion of a drainage tunnel under or through the ice dam or by a channel over the ice dam. Cold polar ice dams generally drain supraglacially or marginally by downmelting of an outlet channel. Warmer temperate-ice dams tend to fail by sudden englacial or subglacial breaching and drainage. Late neoglacial moraine-dammed lakes are located in steep mountain areas affected by the advances and retreats of valley glaciers in the last several centuries. The most common reported failure mechanism is overtopping and breaching by a wave or series of waves in the lake, generated by icefalls, rockfalls, or snow or rock avalanches. Melting of ice-cores or frozen ground and piping and seepage are other possible failure mechanisms. (Lantz-PTT)

  13. 12. Credit PED. View of tail race and dam showing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. Credit PED. View of tail race and dam showing dumping of construction rubble into river bed by rail car; and preparations for pouring a concrete cap onto tail race wall. Photo c. 1909. - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

  14. The geomorphic influences of beaver dams and failures of beaver dams

    E-print Network

    The geomorphic influences of beaver dams and failures of beaver dams David R. Butlera,T, George P millions to low billions of cubic meters range. Failure of beaver dams is a more common phenomenon than often assumed in the literature. During the past 20 years, numerous cases of dam failure have been

  15. Analysis of earth dam failures: A database approach

    Microsoft Academic Search

    L. M. Zhang; Y. Xu; J. S. Jia

    2009-01-01

    A dam may fail when the loading exceeds the resistance against overtopping, internal erosion, slope instability, sliding\\/overturning, excessive deformation etc. To investigate the causes of failures, it is necessary to study characteristics of the dams which have experienced failures. In this work, more than 1600 dam failure cases throughout the world excluding China are compiled into a database, including details

  16. Environmental Risk Assessment System for Phosphogypsum Tailing Dams

    PubMed Central

    Sun, Xin; Tang, Xiaolong; Yi, Honghong; Li, Kai; Zhou, Lianbi; Xu, Xianmang

    2013-01-01

    This paper may be of particular interest to the readers as it provides a new environmental risk assessment system for phosphogypsum tailing dams. In this paper, we studied the phosphogypsum tailing dams which include characteristics of the pollution source, environmental risk characteristics and evaluation requirements to identify the applicable environmental risk assessment methods. Two analytical methods, that is, the analytic hierarchy process (AHP) and fuzzy logic, were used to handle the complexity of the environmental and nonquantitative data. Using our assessment method, different risk factors can be ranked according to their contributions to the environmental risk, thereby allowing the calculation of their relative priorities during decision making. Thus, environmental decision-makers can use this approach to develop alternative management strategies for proposed, ongoing, and completed PG tailing dams. PMID:24382947

  17. Estimates o the risks associated with dam failure

    Microsoft Academic Search

    P. Ayyaswamy; B. Hauss; T. Hseih; A. Moscati; T. E. Hicks; D. Okrent

    1974-01-01

    The probabilities and potential consequences of dam failure in California, primarily due to large earthquakes, was estimated, taking as examples eleven dams having a relatively large population downstream. Mortalities in the event of dam failure range from 11,000 to 260,000, while damage to property may be as high as $720 million. It was assumed that an intensity IX or X

  18. GIS Model for Estimating Dam Failure Life Loss

    Microsoft Academic Search

    Maged Aboelata; David S. Bowles; Duane M. McClelland

    This paper describes a modular geographical information system (GIS) model that is being developed for estimating potential loss of life from natural and dam-failure floods. The model can be used to provide life-loss estimates for use in dam safety risk assessments, including dam failure caused by terrorism. It can be used to explore options for reducing life loss by reducing

  19. 2. VIEW OF EAST TAILING DAM (FOREGROUND), LOOKING EAST SOUTHEAST ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW OF EAST TAILING DAM (FOREGROUND), LOOKING EAST SOUTHEAST UP WASH TOWARD ORE BIN, OVERBURDEN, ADITS, AND ROAD SHOWN IN CA-290-1. MILL SITE IS UP AND TO THE RIGHT OF THIS VIEW. STANDARD FIFTY-GALLON DRUM IN FOREGROUND GIVES SCALE OF WALL. - Skidoo Mine, Park Route 38 (Skidoo Road), Death Valley Junction, Inyo County, CA

  20. Landslide dam failure and flood hydraulics. Part I: experimental investigation

    Microsoft Academic Search

    Zhixian Cao; Zhiyuan Yue; Gareth Pender

    Landslide dam failure can trigger catastrophic flooding in the downstream. However, field observation of such flooding is\\u000a rarely available, while laboratory experimental studies are sparse. The mechanism of landslide dam failure and the flood has\\u000a so far remained insufficiently understood. Here, we present an experimental investigation of landslide dam failure and the\\u000a flood. A total of 28 runs of experiments

  1. Geochemical modeling of cyanide in tailing dam gold processing plant

    NASA Astrophysics Data System (ADS)

    Khodadadi, Ahmad; Monjezi, M.; Mehrpouya, H.; Dehghani, H.

    2009-09-01

    This research is aimed at investigating possible neutralization of cyanide in tailing dam of Muteh gold processing plant in Isfahan, Iran at various conditions such as pH and temperature using USEPA Visual MINTEQ geochemical model simulation. The model is based on geochemical equilibrium which uses the simultaneous solution of the non-linear mass action expressions and linear mass balance relationships to formulate and solve the multiple-component chemical equilibrium problems. In this study the concentration of aqueous species in tailing dam as an aqueous, solid and gaseous were used as input in the model. Temperature and pH variation were simulated. The results of the model indicated that cyanide may be complexes in 10 < pH < 5. In other pH values complexation is not important. The results also indicated that cyanide reduction mechanism in acidic pH and temperature above 30°C is due to cyanide acid formation which is vaporized.

  2. Life Loss Evaluation of Dam Failure Based on VOF Method

    Microsoft Academic Search

    Luo Jia-Qian; Huang Ling; Sun Yue-Feng; Wang Xiao-Ling; An Juan; Li Tao

    2009-01-01

    The life loss model of dam failure based on standard k-epsiv model coupled with the volume of fluid (VOF) method is studied in this paper. The improved Graham method is adopted to estimate the life loss of dam failure. The Gongming reservoir in Shenzhen city is taken as a case study. The calculated life loss is between 7970 to 10504

  3. Risk of dam failure in benefit-cost analysis

    Microsoft Academic Search

    Gregory B. Baecher; M. Elisabeth Paté; Richard De Neufville

    1980-01-01

    A procedure is presented for calculating the costs of failure of a dam and for incorporating these risk costs into the evaluation process. Basically, it involves a calculation of expected value. One critical issue is what the probability of failure should be; given that research will not provide accurate values for some time, a default value (of 10?4 per dam

  4. Dams and Dam Failure - Module 1: Terminology and Open Channel Hydraulics

    NSDL National Science Digital Library

    COMET

    2008-03-19

    This is the first module of a two-part series offering an introduction to the science explaining catastrophic dam failure and flood-wave prediction methods associated with these events. Through use of rich illustrations, animations, and interactions, this module explains key terminology and concepts including dam types and purposes, failure statistics, the general dam failure process, open channel hydraulics, critical flow, Manning's equation, and conveyance. The information covered in this two module series will provide a scientific foundation for advanced course work needed to run dam break simulations and to conduct hydraulic modeling as a part of dynamic wave forecasting.

  5. Field Experimental Analysis of Prototype Twin Dam Failure Phenomenon

    NASA Astrophysics Data System (ADS)

    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.

  6. ESTIMATING OVERALL RISK OF DAM FAILURE: PRACTICAL CONSIDERATIONS IN COMBINING FAILURE PROBABILITIES

    Microsoft Academic Search

    Peter Hill; David Bowles; Phillip Jordan; Rory Nathan

    2004-01-01

    With the move to a risk based approach to dam safety there has been a concomitant focus on estimating the probability of failure of dams. The majority of risk guidelines relate to the total probability of failure and therefore the individual probabilities estimated for different components and loading conditions need to be combined. In most cases the failure modes of

  7. A MODEL FOR ESTIMATING DAM FAILURE LIFE LOSS

    Microsoft Academic Search

    Maged Aboelata; David S. Bowles; Duane M. McClelland

    2003-01-01

    This paper describes a modular geographical information system (GIS) modelling system for estimating potential loss of life from natural and dam -failure floods. The model provides life-loss estimates for use in dam safety risk assessments. It can also be used to explore options for improving the effectiveness of detection, notification, warning, emergency planning and emergency response. The simulation modelling system

  8. Dams and Dam Failure - Module 2: St. Venant Equations, Modeling, and Case Study

    NSDL National Science Digital Library

    2014-09-14

    This second module in the two-part series expands on the science explaining catastrophic dam failure and flood-wave prediction methods associated with these events. Through the use of rich illustrations and interactions, this module introduces the St. Venant equations for dynamic wave flow, and flood wave characteristics. It also explains the general dam failure modeling process along with advantages and limitations of dam failure models including model stability, accuracy, and sensitivity issues. Finally, it also provides an overview of the Teton River dam failure, one of the most famous hydrologic events in U.S. history. The two modules that comprise this series are designed to be taken consecutively and together provide a fundamental understanding of this complex hydrologic topic.

  9. Estimating Overall Risk of Dam Failure: Practical Considerations in Combining Failure Probabilities ANCOLD 2003 Risk Workshop Page 1

    E-print Network

    Bowles, David S.

    Estimating Overall Risk of Dam Failure: Practical Considerations in Combining Failure Probabilities ANCOLD 2003 Risk Workshop Page 1 ESTIMATING OVERALL RISK OF DAM FAILURE: PRACTICAL CONSIDERATIONS the probability of failure of dams. The majority of risk guidelines relate to the total probability of failure

  10. Dynamic model failure tests of dam structures Dalian University of Technology, Dalian 116024, China

    E-print Network

    Spencer Jr., B.F.

    Dynamic model failure tests of dam structures Gao Lin Dalian University of Technology, Dalian 116024, China ABSTRACT: For the earthquake safety evaluation of dam structures, it is desirable to extend failure tests of a number of concrete gravity dams, concrete arch dams and embankment dams have been

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

    USGS Publications Warehouse

    Torres-Sierra, Heriberto; Gómez-Fragoso, Julieta

    2015-01-01

    Results from the simulated dam failure of the Lago de Matrullas Dam using the HEC–RAS model for the 6- and 24-hour PMP events showed peak discharges at the dam of 3,149.33 and 3,604.70 m3/s, respectively. Dam failure during the 100-year-recurrence, 24-hour rainfall event resulted in a peak discharge of 2,103.12 m3/s directly downstream from the dam. Dam failure under sunny day conditions produced a peak discharge of 1,695.91 m3/s at the dam assuming the antecedent lake level was at the morning-glory spillway invert elevation. Flood-inundation maps prepared as part of the study depict the flood extent and provide valuable information for preparing an Emergency Action Plan. Results of the failure analysis indicate that a failure of the Lago de Matrullas Dam could cause flooding to many of the inhabited areas along stream banks from the Lago de Matrullas Dam to the mouth of the Río Grande de Manatí. Among the areas most affected are the low-lying regions in the vicinity of the towns of Ciales, Manatí, and Barceloneta. The delineation of the flood boundaries near the town of Barceloneta considered the effects of a levee constructed during 2000 at Barceloneta in the flood plain of the Río Grande de Manatí to provide protection against flooding to the near-by low-lying populated areas. The results showed overtopping can be expected in the aforementioned levee during 6- and 2

  12. Analysis of Dam Failure in the Saluda River February 8, 2005

    E-print Network

    Morrow, James A.

    Analysis of Dam Failure in the Saluda River Valley February 8, 2005 Abstract We identify and model two possible failure modes for the Saluda Dam: gradual failure due to an enlarging breach and sudden catas- trophic failure due to liqui#12;cation of the dam. For the #12;rst case we de- scribe the breach

  13. Signature of Rhine Valley sturzstrom dam failures in Holocene sediments of Lake Constance, Germany

    E-print Network

    Gilli, Adrian

    Signature of Rhine Valley sturzstrom dam failures in Holocene sediments of Lake Constance, Germany 4 November 2003; received in revised form 12 April 2004; accepted 26 April 2004 Abstract Landslide-dammed that the hyperpycnite deposits are directly related to the failure of two sturzstrom dams and the draining of the dammed

  14. Present situation and cause analysis of diversion dam failures in Japan

    Microsoft Academic Search

    Hajime Miwa; Eiichi Kurashima

    2003-01-01

    Diversion dams are settled in river channels to dam water. They obstruct flood flow and also affect sediment movement on riverbeds. Dam structures break due to local scouring of the riverbed caused by local flow around them. The causes of such failures should be studied by investigating how flow meanders over alternate bars during floods. Diversion dam failures are classified

  15. THE PREDICTION OF FLASH FLOOD CAUSED BY DAM FAILURE A CASE STUDY AT THE THE THA DAN DAM, THAILAND

    Microsoft Academic Search

    Pakorn PETCHPRAYOON

    The Tha Dan Dam, Nayok Province, was selected as a case study to predict flood disaster caused by dam failure and overflow through spillway. It is a roller-compacted concrete dam with 114 meters above the mean sea level of ridge height and 224 million m3 of volume capacity. The objectives of this study were to predict the characteristics of flood

  16. A Procedure for Estimating Loss of Life Caused by Dam Failure

    Microsoft Academic Search

    W. J. Graham

    1999-01-01

    ABSTRACT Risk assessments,and other dam safety studies often require that,an estimate,be made,of the,number,of fatalities,that would result from dam failure. To assist in this effort, an extensive,evaluation,of dam,failures,and,the,factors,that contributed,to loss,of life,was,conducted. Every,U.S. dam,failure,that,resulted,in more,than,50

  17. Numerical modelling of dam failure due to flow overtopping

    Microsoft Academic Search

    TAWATCHAI TINGSANCHALI; CHAIYUTH CHINNARASRI

    2001-01-01

    A one-dimensional numerical model for dam failure due to flow overtopping is developed. The MacCormack explicit finite difference scheme is used to solve the one-dimensional equations of continuity and momentum for unsteady varied flow over steep bed slopes. In the computation of erosion process, sediment transport equations are considered and the modified Smart formula developed for steep bed slope is

  18. Real time prediction approach for floods caused by failure of natural dams due to overtopping

    Microsoft Academic Search

    Hongbo Ma; Xudong Fu

    This paper presents a real time prediction approach for floods caused by failure of natural dams due to overtopping. The approach adopts the observed outflow data of the preceding failure process for calibrating a simulation model, and the calibrated model is then implemented to predict the remaining failure process and flood characteristics. A widely used parametric model of dam failure

  19. Methods for predicting peak discharge of floods caused by failure of natural and constructed earthen dams

    Microsoft Academic Search

    Joseph S. Walder; Jim E. O'Connor

    1997-01-01

    Floods from failures of natural and constructed dams constitute a widespread hazard to people and property. Expeditious means of assessing flood hazards are necessary, particularly in the case of natural dams, which may form suddenly and unexpectedly. We revise statistical relations (derived from data for past constructed and natural dam failures) between peak discharge (Qp) and water volume released (V0)

  20. Late Pleistocene earthquake-triggered moraine dam failure and outburst of Lake Zurich, Switzerland

    E-print Network

    Gilli, Adrian

    Late Pleistocene earthquake-triggered moraine dam failure and outburst of Lake Zurich, Switzerland hazardous in glaciated areas throughout the world because dams can fail suddenly producing destructive of $20,600 m3 sÀ1 . We also discuss long-term causes and short-term trigger mechanisms of the dam failure

  1. Using Runoff Hydrograph Model for Early Detecting Landslide Dam Failure

    NASA Astrophysics Data System (ADS)

    Chompuchan, C.; Chen, W. L.; Lin, C. Y.

    2014-12-01

    In mountainous areas, many studies explored that during extreme rainfall event induced landslide dams failure and consequently caused the catastrophe damage of lives and infrastructures at the downstream of the watershed. The detection of initial landslide dam formation and the estimation of its occurrence position in the upstream were essential to warn the residents and evacuate in advance. The devices currently used, such as wire sensor, geophone sensor, and infrared cameras (CCD) are classified as the post-event type sensor, which only has a shorter response time, and can just hardly satisfy the requirement which people expect from precaution system. To predict disasters earlier and increase response time, this study used the change point derived from comparing theoretical and observing runoff hydrograph. Chishan River watershed was selected as a case study. Grid Rational Algorithm for Predicting Hydrograph (GRAPH), the dynamic rainfall - runoff model, was used to calibrate watershed runoff hydrograph parameter. The landslide dams were simulated at difference distances along the river, and the runoff hydrographs were compared. Then, the rainfall data and landslide dam failure during Typhoon Morakot in August 2009 was verified the model.The result showed that, during the initial landslide dam formation, the observed accumulate and peak flow hydrograph reduced significantly in comparison with theoretical flow. This model can be applied to establish an efficient warning system for debris flow occurring precaution. In addition, this study has been improved for a longer response time by integrating traditional observation system and runoff hydrograph warning systems and can provide to the references of related authorities.

  2. Design, construction and management of tailings storage facilities for surface disposal in China: case studies of failures.

    PubMed

    Wei, Zuoan; Yin, Guangzhi; Wang, J G; Wan, Ling; Li, Guangzhi

    2013-01-01

    Rapid development of China's economy demands for more mineral resources. At the same time, a vast quantity of mine tailings, as the waste byproduct of mining and mineral processing, is being produced in huge proportions. Tailings impoundments play an important role in the practical surface disposal of these large quantities of mining waste. Historically, tailings were relatively small in quantity and had no commercial value, thus little attention was paid to their disposal. The tailings were preferably discharged near the mines and few tailings storage facilities were constructed in mainland China. This situation has significantly changed since 2000, because the Chinese economy is growing rapidly and Chinese regulations and legislation require that tailings disposal systems must be ready before the mining operation begins. Consequently, data up to 2008 shows that more than 12 000 tailings storage facilities have been built in China. This paper reviews the history of tailings disposal in China, discusses three cases of tailings dam failures and explores failure mechanisms, and the procedures commonly used in China for planning, design, construction and management of tailings impoundments. This paper also discusses the current situation, shortcomings and key weaknesses, as well as future development trends for tailings storage facilities in China. PMID:23064963

  3. Uncertainty analysis of river flooding and dam failure risks using local sensitivity computations.

    E-print Network

    Paris-Sud XI, Université de

    Uncertainty analysis of river flooding and dam failure risks using local sensitivity computations) for uncertainty analysis with respect to two major types of risk in river hydrodynamics: flash flood and dam estimates for output mean and than 4.5% for output standard deviation. For the challenging dam-break problem

  4. Morphological responses and sediment processes following a typhoon-induced dam failure, Dahan

    E-print Network

    Tullos, Desiree

    Morphological responses and sediment processes following a typhoon-induced dam failure, Dahan River gravel and sand was exposed when Barlin Dam failed during Typhoon WeiPa in 2007. The dam was located on the Dahan River, Taiwan, a system characterized by steep river gradients, typhoon- and monsoon

  5. The potential for catastrophic dam failure at Lake Nyos maar, Cameroon

    Microsoft Academic Search

    J. P. Lockwood; J. E. Costa; M. L. Tuttle; J. Nni; S. G. Tebor

    1988-01-01

    The upper 40 m of Lake Nyos is bounded on the north by a narrow dam of poorly consolidated pyroclastic rocks, emplaced during the eruptive formation of the Lake Nyos maar a few hundred years ago. This 50-m-wide natural dam is structurally weak and is being eroded at an uncertain, but geologically alarming, rate. The eventual failure of the dam

  6. Assessment of Downstream Hazard Potential for Dam Failure in Rhode Island Primary Investigators

    E-print Network

    Rhode Island, University of

    Assessment of Downstream Hazard Potential for Dam Failure in Rhode Island Primary Investigators Mayrai Gindy Natacha Thomas Richard Madsen #12;FINAL REPORT Rhode Island Water Resources Center May 2007 Assessment of Downstream Hazard Potential for Dam Failure in Rhode Island Mayrai Gindy, University of Rhode

  7. A short study of dam failures in Australia, 1857-1983

    Microsoft Academic Search

    O. G. Ingles

    1984-01-01

    A short account is presented of Australian dams which have failed to perform according to expectation. The coverage is more extensive than that adopted by ICOLD, and extends to all dams with a maximum wall height of 7 m or more. The failure rate is found to be independent of height; and the number of failures to have approximately doubled

  8. Computer Analog Computation of Large Dam Shear-Slipping Failure Probability

    Microsoft Academic Search

    Chen Zaitie; Shi Hui; Wu Zufu

    2009-01-01

    Failure probability calculation is what the large dam risk evaluation is based on. The computer simulation method can solve the difficulty in linearizing the state function, normalizing the nonnormal random variable equivalent and transforming the relevant random variables during the calculation of dam failure probability by means of first order second moment method . On the basis of the analysis

  9. Pre-Event Dam Failure Analyses for Emergency Management

    Microsoft Academic Search

    Zafer BOZKUS

    Simultaneous dam-break analyses of two dams, namely the Nilufer and Do? ganci dams, due to a breach in their bodies, were performed under various hydraulic conditions. Both of the dams are located in the same river branch of the Nilufer Basin in the province of Bursa in Turkey. The main purpose of the study was to see the negative effects

  10. Methods for predicting peak discharge of floods caused by failure of natural and constructed earthen dams

    USGS Publications Warehouse

    Walder, J.S.; O'Connor, J. E.

    1997-01-01

    Floods from failures of natural and constructed dams constitute a widespread hazard to people and property. Expeditious means of assessing flood hazards are necessary, particularly in the case of natural dams, which may form suddenly and unexpectedly. We revise statistical relations (derived from data for past constructed and natural dam failures) between peak discharge (Q(p)) and water volume released (V(0)) or drop in lake level (d) but assert that such relations, even when cast into a dimensionless form, are of limited utility because they fail to portray the effect of breach-formation rate. We then analyze a simple, physically based model of dam-breach formation to show that the hydrograph at the breach depends primarily on a dimensionless parameter ?? = kV0/g1/2d7/2, where k is the mean erosion rate of the breach and g is acceleration due to gravity. The functional relationship between Q(p) and ?? takes asymptotically distinct forms depending on whether ?? > 1 (relatively fast breach formation or large lake volume). Theoretical predictions agree well with data from dam failures for which k, and thus ??, can be estimated. The theory thus provides a rapid means of predicting the plausible range of values of peak discharge at the breach in an earthen dam as long as the impounded water volume and the water depth at the dam face can be estimated.

  11. Failure mode analysis of a post-tension anchored dam using linear finite element analysis

    NASA Astrophysics Data System (ADS)

    Corn, Aimee

    There are currently over 84,000 dams in the United States, and the average age of those dams is 52 years. Concrete gravity dams are the second most common dam type, with more than 3,000 in the United States. Current engineering technology and technical understanding of hydrologic and seismic events has resulted in significant increases to the required design loads for most dams; therefore, many older dams do not have adequate safety for extreme loading events. Concrete gravity dams designed and constructed in the early 20th century did not consider uplift pressures beneath the dam, which reduces the effective weight of the structure. One method that has been used to enhance the stability of older concrete gravity dams includes the post-tension anchor (PTA) system. Post-tensioning infers modifying cured concrete and using self-equilibrating elements to increase the weight of the section, which provides added stability. There is a lack of historical evidence regarding the potential failure mechanisms for PTA concrete gravity dams. Of particular interest, is how these systems behave during large seismic events. The objective of this thesis is to develop a method by which the potential failure modes during a seismic event for a PTA dam can be evaluated using the linear elastic finite element method of analysis. The most likely potential failure modes (PFM) for PTA designs are due to tensile failure and shear failure. A numerical model of a hypothetical project was developed to simulate PTAs in the dam. The model was subjected to acceleration time-history motions that simulated the seismic loads. The results were used to evaluate the likelihood of tendon failure due to both tension and shear. The results from the analysis indicated that the PTA load increased during the seismic event; however, the peak load in the tendons was less than the gross ultimate tensile strength (GUTS) and would not be expected to result in tensile failure at the assumed project. The analysis also indicated there was a potential for permanent horizontal displacement along the dam/foundation interface. The horizontal movement was not considered large enough to develop a shear failure of the tendons at the project. The results from this study indicate demand to capacity ratios (DCR) of 0.79 for the anchor head, 0.75 for the tendon, and 0.63 for the foundation cone failure, and a potential displacement of 0.33 inches, which is not large enough to shear the tendon. The methods developed are appropriate for the evaluation of the tensile and shear failure modes for the PTA tendons. Based on the results, it would appear that shear failure of the tendon is a more likely failure mechanism. Thus, shear failure of the tendon should be a focus of seismic evaluations.

  12. SPILL ALERT DEVICE FOR EARTH DAM FAILURE WARNING

    EPA Science Inventory

    A spill alert device for determining earth dam safety based on the monitoring of the acoustic emissions generated in a deforming soil mass was developed and field-tested. The acoustic emissions are related to the basic mechanisms from which soils derive their strength. Laboratory...

  13. Design Flood Impacts on Evaluating Dam Failure Mechanisms

    Microsoft Academic Search

    Steven R. Abt; Rodney J. Wittler; James F. Ruff

    1996-01-01

    The implementation of the Probable Maximum Flood as the basis for the inflow design flood for evaluating dam safety has shown that existing analysis procedures and methods are inadequate. A collaborative team from the U.S. Bureau of Reclamation, Colorado State University Pacific Gas and Electric Co., the Electric Power and Research Institute, and HDR Engineering, Inc., has identified three critical

  14. Spirit Lake dam-failure flood routing assessment

    USGS Publications Warehouse

    Kresch, D.L.

    1985-01-01

    Potential clear-water floodflows resulting from uncontrolled breaching by Spirit Lake of a debris dam deposited by the May 18 , 1980, eruption of Mount St. Helens, Washington, were evaluated. U.S. Geological Survey dam-break model K-634 was utilized, first to compute clear-water flood hydrographs for various hypothetical breach scenarios, and then to hydraulically route them downstream to the mouth of the Toutle River. Dam-break computations were obtained for 12 breach-development scenarios. Eight of the scenarios modeled breaches caused by overtopping of the June 1982 crest of the debris dam, while the other four modeled breaches resulting from overtopping of the debris dam at a possible future crest altitude of 3,490 feet. Equal numbers of scenarios, six each, were modeled for breach development durations of 0.25 hour and 1.0 hour. Peak discharges and times of arrival at selected locations for scenarios with breach development durations of 1.0 hour are presented in tables. Peak discharges computed for dam-break scenarios with breach crest widths of 400 feet are almost twice the magnitude of those computed for scenarios identical in all other respects, but with widths of 200 feet. Peak discharges computed for breaches caused by overtopping of the debris dam at an altitude of 3,531.8 feet were generally found to be roughly five times greater than those caused by overtopping at an altitude of 3,490 feet, if the breaches had identical crest elevations and crest widths. Decreases in peak discharge from Spirit Lake to the mouth of the Toutle River ranged from 16 to 26 percent for the scenarios modeled. This lack of significant attenuation is primarily due to the large volume and surface area of Spirit lake (in excess of 360,000 acre-feet and 3,000 acres, respectively, for all scenarios modeled), which result in the continued discharge of high flows long after breach development is complete. The degree of attenuation is also minimized by the generally steep narrow valleys through which the North Fork Toutle and Toutle Rivers flow. Elapsed time from beginning of breach development to arrival of peak discharges at the mouth of the Toutle River ranged from 4.3 to 7.4 hours for the scenarios modeled. (USGS)

  15. The geomorphic influences of beaver dams and failures of beaver dams

    Microsoft Academic Search

    David R. Butler; George P. Malanson

    2005-01-01

    Uncounted millions of beaver ponds and dams existed in North America prior to European contact and colonization. These ponds acted as sediment traps that contained tens to hundreds of billions of cubic meters of sediment that would otherwise have passed through the fluvial system. Removal of beavers by overtrapping in the 16th 19th centuries severely reduced their number and the

  16. The geomorphic influences of beaver dams and failures of beaver dams

    Microsoft Academic Search

    David R. Butler; George P. Malanson

    2005-01-01

    Uncounted millions of beaver ponds and dams existed in North America prior to European contact and colonization. These ponds acted as sediment traps that contained tens to hundreds of billions of cubic meters of sediment that would otherwise have passed through the fluvial system. Removal of beavers by overtrapping in the 16th–19th centuries severely reduced their number and the number

  17. Flood routing simulation for dam failure time estimation

    Microsoft Academic Search

    Suk-Hwan Jang; Sun-Woong Jung

    2012-01-01

    Yeon-Cheon dam was built in Han-Tan river in south Korea in May 1985. It was originally constructed for the purpose of small hydro power made by concrete and partly earth. And it was located cross the mid stream of Han-Tan river having hilly topographic characteristic. Therefore it has run-of-river type reservoir with very short detention time and small storage volume.

  18. Dams

    NSDL National Science Digital Library

    1997-01-01

    National Geographic's Dams Web site offers an interactive investigation into the good and bad impacts of dam construction. Visitors choose to view a river system before, during, or after a dam is built. Then at each time interval they can click on various sections of the river and read a short description of what is happening there. For example, after the dam is built, the reservoir that is created upstream causes several hydrological problems such as loss of water from evaporation. Although the text provided on the site is somewhat lacking, the well-done graphics and interactivity make it worth a visit.

  19. The potential for catastrophic dam failure at Lake Nyos maar, Cameroon

    USGS Publications Warehouse

    Lockwood, J.P.; Costa, J.E.; Tuttle, M.L.; Nni, J.; Tebor, S.G.

    1988-01-01

    The upper 40 m of Lake Nyos is bounded on the north by a narrow dam of poorly consolidated pyroclastic rocks, emplaced during the eruptive formation of the Lake Nyos maar a few hundred years ago. This 50-m-wide natural dam is structurally weak and is being eroded at an uncertain, but geologically alarming, rate. The eventual failure of the dam could cause a major flood (estimated peak discharge, 17000 m3/s) that would have a tragic impact on downstream areas as far as Nigeria, 108 km away. This serious hazard could be eliminated by lowering the lake level, either by controlled removal of the dam or by construction of a 680-m-long drainage tunnel about 65 m below the present lake surface. Either strategy would also lessen the lethal effects of future massive CO2 gas releases, such as the one that occurred in August 1986. ?? 1988 Springer-Verlag.

  20. Seismic analysis of the Par Pond Dam: Study of slope failure and liquefaction. Technical evaluation report

    SciTech Connect

    Simos, N.; Reich, M.

    1994-07-01

    Stability concerns of the Par Pond Dam, an embankment structure in the Savannah River Site complex, resulted in a comprehensive evaluation of the state of its integrity. Specifically, excessive seepage through the embankment, slope failure due to an earthquake event as well as liquefaction potential of the embankment and the foundation are addressed and the potential of failure is evaluated. Lastly, remedial benefits of the addition of a berm structure are also assessed.

  1. Network evacuation modelling for flooding as a result of dam failure

    Microsoft Academic Search

    F Southworth; S-M Chin

    1987-01-01

    The MASSVAC approach to network evacuation modelling is tested, and its results enhanced by a color graphics program called MVOPL. This MASSVAC-MVOPL analysis system is used to model population evacuations under the threat of flooding as a result of dam failure. The system operates on a microcomputer, with turnaround times that allow it to be rerun within a matter of

  2. Characteristics of Landslide Dam Failure by Practicing an Original Scale Field Experiment in Landow Creek, Huisun Experimental Forest, Taiwan

    NASA Astrophysics Data System (ADS)

    Chen, Su-Chin; Hsu, Tzu-Yang; Chao, Yi-Chiung

    2013-04-01

    This research built two artificial landslide dams, an original scale field experiment, in Landow creek, Huisun experimental forest on November 7th 2012. The purposes are to discuss characteristics of landslide dam failure, such as variations of velocity, development of the breach, and alteration of topography. We present four CCDs at upstream and downstream sides of two artificial landslide dams and used the Unmanned Aerial Vehicle (UAV) for monitoring and recording the processes of landslide dam failures. Besides, six water level sensors set up at upstream, and downstream sides of dams to identify inflow and outflow water level and determine the flow discharge; then, applying image judgments technique to determine the flow velocity and direction. Moreover, 3D LiDar scanner used to analyze the river morphology before and after the experiment. Landslide dam failure proceeds with three steps, pipping, turning into retrogressive erosion, and overtopping; however, overtopping dominates the most phenomenon in this experiment. During the impoundment filling, the downstream slope of landslide dam tends to steep as the retrogressive erosion occurs. After dam failure, the impoundment filled with sedimentary deposits; in addition, the original downstream main channel develops into many new flow paths and becomes braided river morphology. The momentary velocity of dam outbreak was nearly three times the inflow velocity; then the momentary discharge from the first failed dam to second dam was over more than 50 times the inflow discharge. The sediment concentration was inversely proportional to time at both upstream and downstream side due to the armor layer decreased. There are two outburst breaches processes, V and U types. The breaches development of two dams were both from V to U type, and vertical degradation to horizontal extension. The first breach dimension and the impoundment volume are both smaller than the second dam; hence we assumed that the breach dimension and impoundment volume have a significant correlation. The research results could provide better analyzing landslide dam hazards.

  3. CALCULATION OF DISCHARGE OF DEBRIS FLOWS CAUSED BY MORAINE-DAM FAILURE AT MIDUI GULLY, TIBET, CHINA

    Microsoft Academic Search

    X. Q. CHEN; P. CUI; N. S. CHEN; J. GARDNER

    Debris flows caused by moraine-dam failure are common on the Qinghai-Tibet Plateau in China. Peak discharges of debris flows should be predicted to evaluate the risk to people and property in valleys below the moraine dams. On the basis of the critical wave method, we have reduced a new series of formulas about the peak discharge of debris flow, including

  4. Signature of Rhine Valley sturzstrom dam failures in Holocene sediments of Lake Constance, Germany

    Microsoft Academic Search

    Jean-Luc Schneider; Nicolas Pollet; Emmanuel Chapron; Martin Wessels; Patrick Wassmer

    2004-01-01

    Landslide-dammed lakes that form upstream of large-scale rockslide-avalanches (=sturzstroms) present an enormous potential hazard to downstream areas. Such failures are recorded in the Early Holocene sediments of Upper Lake Constance (Germany) by the presence of two clastic layers that were emplaced around 9400 cal. YBP. The sedimentology of these layers contrasts sharply with the typical Late Glacial and Holocene lacustrine

  5. Moraine-dammed lake failures in Patagonia and assessment of outburst susceptibility in the Baker Basin

    NASA Astrophysics Data System (ADS)

    Iribarren Anacona, P.; Norton, K. P.; Mackintosh, A.

    2014-07-01

    Glacier retreat since the Little Ice Age has resulted in the development or expansion of hundreds of glacial lakes in Patagonia. Some of these lakes have produced large (?106 m3) Glacial Lake Outburst Floods (GLOFs) damaging inhabited areas. GLOF hazard studies in Patagonia have been mainly based on the analysis of short-term series (?50 years) of flood data and until now no attempt has been made to identify the relative susceptibility of lakes to failure. Power schemes and associated infrastructure are planned for Patagonian basins that have historically been affected by GLOFs, and we now require a thorough understanding of the characteristics of dangerous lakes in order to assist with hazard assessment and planning. In this paper, the conditioning factors of 16 outbursts from moraine dammed lakes in Patagonia were analysed. These data were used to develop a classification scheme designed to assess outburst susceptibility, based on image classification techniques, flow routine algorithms and the Analytical Hierarchy Process. This scheme was applied to the Baker Basin, Chile, where at least 7 moraine-dammed lakes have failed in historic time. We identified 386 moraine-dammed lakes in the Baker Basin of which 28 were classified with high or very high outburst susceptibility. Commonly, lakes with high outburst susceptibility are in contact with glaciers and have moderate (>8°) to steep (>15°) dam outlet slopes, akin to failed lakes in Patagonia. The proposed classification scheme is suitable for first-order GLOF hazard assessments in this region. However, rapidly changing glaciers in Patagonia make detailed analysis and monitoring of hazardous lakes and glaciated areas upstream from inhabited areas or critical infrastructure necessary, in order to better prepare for hazards emerging from an evolving cryosphere.

  6. Lessons from a Dam Failure1 JAMI;S E. EVANS, SCUDDKR D. MACKKY, JOHAN F. GOTTC.KNS, AND WILFRID M. GILL, Department of Geology, Bowling Green State

    E-print Network

    Gottgens, Hans

    Lessons from a Dam Failure1 JAMI;S E. EVANS, SCUDDKR D. MACKKY, JOHAN F. GOTTC.KNS, AND WILFRID M, OH 43606, and Enecotech Southwest, Inc., Phoenix, AZ 85004. ABSTRACT. The IVEX Dam (Chagrin River of the dam. The failure was the result of seepage piping at the toe of the dam, near the masonry spillway

  7. Atrophy and growth failure of rat hindlimb muscles in tail-cast suspension

    NASA Technical Reports Server (NTRS)

    Jaspers, S. R.; Tischler, M. E.

    1984-01-01

    The primary objective of the present study is related to an evaluation of a modified tail-cast suspension model as a means of identifying metabolic factors which control or are associated with muscle atrophy and growth failure. Two different control conditions (normal and tail-casted weight bearing) were studied to determine the appropriate control for tail-cast suspension. A description is presented of a model which is most useful for studying atrophy of hindlimb muscles under certain conditions. Female Sprague-Dawley rats were employed in the experiments. Attention is given to growth rate and urinary excretion of urea and ammonia in different types of rats, the relationship between body weight and skeletal muscle weight, and the relationship between animal body weight and rates of protein synthesis and protein degradation.

  8. Cardiomyopathy and right-sided congestive heart failure in a red-tailed hawk (Buteo jamaicensis).

    PubMed

    Knafo, S Emmanuelle; Rapoport, Gregg; Williams, Jamie; Brainard, Benjamin; Driskell, Elizabeth; Uhl, Elizabeth; Crochik, Sonia; Divers, Stephen J

    2011-03-01

    A 15-year-old female red-tailed hawk (Buteo jamaicensis) was evaluated because of dyspnea, anorexia, and coelomic distension. Diagnostic imaging results confirmed severe coelomic effusion and revealed a markedly dilated right ventricle. The diagnosis was right-sided congestive heart failure. Results of measurements of vitamin E, selenium, lead, zinc, and cardiac troponin levels were normal or nondiagnostic. The hawk was treated with furosemide, antifungal and antimicrobial agents, and supplemental fluids and oxygen, but euthanasia was elected because of the poor prognosis and the practical difficulties associated with intensive case management. To our knowledge, this is the first described case of cardiomyopathy and congestive heart failure in a captive red-tailed hawk. PMID:21657185

  9. Arsenic Concentrations in Soils Impacted by Dam Failure of Coal-Ash Pond in Zemianske Kostolany, Slovakia

    Microsoft Academic Search

    L’ubomír Jurkovi?; Edgar Hiller; Veronika Veselská; Katarína Pet’ková

    2011-01-01

    In this study, the concentrations of arsenic were determined in the soils around old coal-ash pond. The soils in the study\\u000a area were severely contaminated with arsenic after dam failure of the coal-ash pond. The mean concentrations of arsenic in\\u000a soils collected from three sampling depths of 0–20, 20–40 and >40 cm were 173, 155 and 426 ?g\\/g, respectively, exceeding greatly\\u000a the

  10. Characterizing the dam break release

    E-print Network

    Wu, Juliana, S.B. Massachusetts Institute of Technology

    2014-01-01

    The failure of a dam can cause disastrous consequences, thus understanding the nature of a dam break is of utmost importance. A model of a dam break was built and used to profile the resulting wave. The gate release was ...

  11. Assessment of Vegetation Establishment on Tailings Dam at an Iron Ore Mining Site of Suburban Beijing, China, 7 Years After Reclamation with Contrasting Site Treatment Methods

    NASA Astrophysics Data System (ADS)

    Yan, Demin; Zhao, Fangying; Sun, Osbert Jianxin

    2013-09-01

    Strip-mining operations greatly disturb soil, vegetation and landscape elements, causing many ecological and environmental problems. Establishment of vegetation is a critical step in achieving the goal of ecosystem restoration in mining areas. At the Shouyun Iron Ore Mine in suburban Beijing, China, we investigated selective vegetation and soil traits on a tailings dam 7 years after site treatments with three contrasting approaches: (1) soil covering (designated as SC), (2) application of a straw mat, known as "vegetation carpet", which contains prescribed plant seed mix and water retaining agent (designated as VC), on top of sand piles, and (3) combination of soil covering and application of vegetation carpet (designated as SC+VC). We found that after 7 years of reclamation, the SC+VC site had twice the number of plant species and greater biomass than the SC and VC sites, and that the VC site had a comparable plant abundance with the SC+VC site but much less biodiversity and plant coverage. The VC site did not differ with the SC site in the vegetation traits, albeit low soil fertility. It is suggested that application of vegetation carpet can be an alternative to introduction of topsoil for treatment of tailings dam with fine-structured substrate of ore sands. However, combination of topsoil treatment and application of vegetation carpet greatly increases vegetation coverage and plant biodiversity, and is therefore a much better approach for assisting vegetation establishment on the tailings dam of strip-mining operations. While application of vegetation carpet helps to stabilize the loose surface of fine-structured mine wastes and to introduce seed bank, introduction of fertile soil is necessary for supplying nutrients to plant growth in the efforts of ecosystem restoration of mining areas.

  12. INTERNATIONAL COMMISSION ON LARGE DAMS

    E-print Network

    Bowles, David S.

    FOR ESTIMATION OF THE PROBABILITY OF FAILURE OF DAMS FOR USE IN QUANTITATIVE RISK ASSESSMENT (* ) Robin FELL: · Failure modes identification · Analysis to estimate the probability of failure of the dam · Calculation the methods available for estimating the probability of failure of embankment and concrete dams, for normal

  13. Late Pleistocene earthquake-triggered moraine dam failure and outburst of Lake Zurich, Switzerland

    Microsoft Academic Search

    M. Strasser; C. Schindler; F. S. Anselmetti

    2008-01-01

    Lakes impounded by moraines may be considered hazardous in glaciated areas throughout the world because dams can fail suddenly producing destructive floods with peak discharges far in excess of normal flows. Here we present a comprehensive case study in the Zurich, Switzerland, area that reveals several independent lines of evidences for the occurrence of a Late Pleistocene (~13,760 calibrated years

  14. A physically-based method for predicting peak discharge of floods caused by failure of natural and constructed earthen dams

    USGS Publications Warehouse

    Walder, J.S.; O'Connor, J. E.; Costa, J.E.

    1997-01-01

    We analyse a simple, physically-based model of breach formation in natural and constructed earthen dams to elucidate the principal factors controlling the flood hydrograph at the breach. Formation of the breach, which is assumed trapezoidal in cross-section, is parameterized by the mean rate of downcutting, k, the value of which is constrained by observations. A dimensionless formulation of the model leads to the prediction that the breach hydrograph depends upon lake shape, the ratio r of breach width to depth, the side slope ?? of the breach, and the parameter ?? = (V.D3)(k/???gD), where V = lake volume, D = lake depth, and g is the acceleration due to gravity. Calculations show that peak discharge Qp depends weakly on lake shape r and ??, but strongly on ??, which is the product of a dimensionless lake volume and a dimensionless erosion rate. Qp(??) takes asymptotically distinct forms depending on whether < ??? 1 or < ??? 1. Theoretical predictions agree well with data from dam failures for which k could be reasonably estimated. The analysis provides a rapid and in many cases graphical way to estimate plausible values of Qp at the breach.We analyze a simple, physically-based model of breach formation in natural and constructed earthen dams to elucidate the principal factors controlling the flood hydrograph at the breach. Formation of the breach, which is assumed trapezoidal in cross-section, is parameterized by the mean rate of downcutting, k, the value of which is constrained by observations. A dimensionless formulation of the model leads to the prediction that the breach hydrograph depends upon lake shape, the ratio r of breach width to depth, the side slope ?? of the breach, and the parameter ?? = (V/D3)(k/???gD), where V = lake volume, D = lake depth, and g is the acceleration due to gravity. Calculations show that peak discharge Qp depends weakly on lake shape r and ??, but strongly on ??, which is the product of a dimensionless lake volume and a dimensionless erosion rate. Qp(??) takes asymptotically distinct forms depending on whether ?????1 or ?????1. Theoretical predictions agree well with data from dam failures for which k could be reasonably estimated. The analysis provides a rapid and in many cases graphical way to estimate plausible values of Qp at the breach.

  15. DDA in fluid-structure problems for the study of gravity dam failure

    Microsoft Academic Search

    Sami Kaidi; Abdellatif Ouahsine; Mohamed Rouainia; Hassan Smaoui

    2010-01-01

    In this paper, we present a 2D coupled fluid-structure interaction procedure to assess the stability of a cracked gravity dam against increasing water level. In this procedure the structure is assumed to be a discontinuous deformable solid containing pre-existing cracks. Thus, the Discontinuous Deformation Analysis DDA method is used to study the solid discontinuous medium, and the continuum finite element

  16. A physically-based method for predicting peak discharge of floods caused by failure of natural and constructed earthen dams

    USGS Publications Warehouse

    Walder, J.S.

    1997-01-01

    We analyse a simple, physically-based model of breach formation in natural and constructed earthen dams to elucidate the principal factors controlling the flood hydrograph at the breach. Formation of the breach, which is assumed trapezoidal in cross-section, is parameterized by the mean rate of downcutting, k, the value of which is constrained by observations. A dimensionless formulation of the model leads to the prediction that the breach hydrograph depends upon lake shape, the ratio r of breach width to depth, the side slope ?? of the breach, and the parameter ?? = (V/ D3)(k/???gD), where V = lake volume, D = lake depth, and g is the acceleration due to gravity. Calculations show that peak discharge Qp depends weakly on lake shape r and ??, but strongly on ??, which is the product of a dimensionless lake volume and a dimensionless erosion rate. Qp(??) takes asymptotically distinct forms depending on whether ?? > 1. Theoretical predictions agree well with data from dam failures for which k could be reasonably estimated. The analysis provides a rapid and in many cases graphical way to estimate plausible values of Qp at the breach.

  17. Rock avalanching into a landslide-dammed lake causing multiple dam failure in Las Conchas valley (NW Argentina) — evidence from surface exposure dating and stratigraphic analyses

    Microsoft Academic Search

    Reginald L. Hermanns; Samuel Niedermann; Susan Ivy-Ochs; Peter W. Kubik

    2004-01-01

    Generally landslide dams which exist for several hundreds to thousands of years are considered as stable. We show with an example from the Argentine Andes that such dams can exist for several thousands of years but still may fail catastrophically. Multiple rock avalanches impounded two lakes with surface areas of ~8 km 2 and ~600 km 2, respectively, in Las Conchas valley,

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

    NASA Astrophysics Data System (ADS)

    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 dam and the methods of monitoring techniques applied by various disciplines. Some results have been obtained from this method for nearly eight years are presented in this work. In addition, the results of bathymetric surveys between 2005 and 2010 will be compared using the cross sections where the maximum changes occurred on the dam bottom of the reservoir area.

  19. Dam Pass or Fail

    NSDL National Science Digital Library

    Integrated Teaching and Learning Program,

    Students conduct Internet research to investigate the purpose and current functioning status of some of the largest dams throughout the world. They investigate the success or failure of eight dams and complete a worksheet. While researching the dams, they also gain an understanding of the scale of these structures by recording and comparing their reservoir capacities. Students come to understand that dams, like all engineered structures, have a finite lifespan and require ongoing maintenance and evaluation for their usefulness.

  20. Probable hydrologic effects of a hypothetical failure of Mackay Dam on the Big Lost River Valley from Mackay, Idaho to the Idaho National Engineering Laboratory

    USGS Publications Warehouse

    Druffel, Leroy; Stiltner, Gloria J.; Keefer, Thomas N.

    1979-01-01

    Mackay Dam is an irrigation reservoir on the Big Lost River, Idaho, approximately 7.2 kilometers northwest of Mackay, Idaho. Consequences of possible rupture of the dam have long concerned the residents of the river valley. The presence of reactors and of a management complex for nuclear wastes on the reservation of the Idaho National Engineering Laboratory (INEL), near the river , give additional cause for concern over the consequences of a rupture of Mackay Dam. The objective of this report is to calculate and route the flood wave resulting from the hypothetical failure of Mackay Dam downstream to the INEL. Both a full and a 50 percent partial breach of this dam are investigated. Two techniques are used to develop the dam-break model. The method of characteristics is used to propagate the shock wave after the dam fails. The linear implicit finite-difference solution is used to route the flood wave after the shock wave has dissipated. The time of travel of the flood wave, duration of flooding, and magnitude of the flood are determined for eight selected sites from Mackay Dam, Idaho, through the INEL diversion. At 4.2 kilometers above the INEL diversion, peak discharges of 1,550.2 and 1,275 cubic meters per second and peak flood elevations of 1,550.3 and 1,550.2 meters were calculated for the full and partial breach, respectively. Flood discharges and flood peaks were not compared for the area downstream of the diversion because of the lack of detailed flood plain geometry. (Kosco-USGS)

  1. Failure of neural tube closure in the loop-tail ( Lp) mutant mouse: analysis of the embryonic mechanism

    Microsoft Academic Search

    Dianne Gerrelli; Andrew J Copp

    1997-01-01

    Loop-tail (Lp) is unique among mouse mutants in failing to initiate neural tube closure at the cervical\\/hindbrain boundary (so-called `Closure 1'), at the 5–7 somite stage. Lp\\/Lp embryos go on to develop a malformation that closely resembles cranio-rachischisis, the most severe neural tube defect found in humans. We investigated several possible embryological mechanisms that may underlie this failure of neural

  2. 75 FR 62024 - Metal and Nonmetal Dams

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-07

    ...and 57 RIN 1219-AB70 Metal and Nonmetal Dams AGENCY: Mine Safety and Health Administration...construction, operation, and maintenance of safe dams which can assure miners are protected from the hazards of dam failures. DATES: The comment period...

  3. Bioaccumulation of Heavy Metals in the Lizard Psammodromus algirus After a Tailing-Dam Collapse in Aznalcóllar (Southwest Spain)

    Microsoft Academic Search

    Rocío Márquez-Ferrando; Xavier Santos; Juan M. Pleguezuelos; Diego Ontiveros

    2009-01-01

    Quantification of heavy metal concentrations in biota is a common technique that helps environmental managers measure the\\u000a level of pollutants circulating in ecosystems. Despite interest in heavy metals as indicators of localized pollution, few\\u000a studies have assessed these pollutants in reptiles. In 1998, the tailing pond of a pyrite mine near Aznalcóllar (southwestern\\u000a Spain), containing mud with high heavy metal

  4. Arsenic concentrations in soils impacted by dam failure of coal-ash pond in Zemianske Kostolany, Slovakia.

    PubMed

    Jurkovi?, L'ubomír; Hiller, Edgar; Veselská, Veronika; Pet'ková, Katarína

    2011-04-01

    In this study, the concentrations of arsenic were determined in the soils around old coal-ash pond. The soils in the study area were severely contaminated with arsenic after dam failure of the coal-ash pond. The mean concentrations of arsenic in soils collected from three sampling depths of 0-20, 20-40 and >40 cm were 173, 155 and 426 ?g/g, respectively, exceeding greatly the Dutch intervention threshold for this element. Arsenic concentrations were positively correlated with total iron and aluminium contents in the soils (r = 0.73, p < 0.001 and r = 0.72, p < 0.001, respectively), indicating that oxyhydroxides of iron and aluminium may control the distribution of arsenic in these soils. Ammonium nitrate extractant was used to mimic availability of arsenic for plant uptake from the soils. Between 0.05 and 6.21% of the total soil arsenic were extracted using a single extraction test and a significant positive correlation between soil leachate pH and arsenic extractability (r = 0.70, p < 0.01) was observed. This suggested that soil pH might play a role in the bioavailability of arsenic. PMID:21331534

  5. Assessment of dam failure flood and a natural, high-magnitude flood in a hyperarid region using paleoflood hydrology, Nahal Ashalim catchment, Dead Sea, Israel

    Microsoft Academic Search

    Noam Greenbaum

    2007-01-01

    A dam failure flood in 1993 with a peak discharge of 600-700 m3 s-1 (volume of 0.5 × 106 m3) and a natural, rainfall-runoff flood with a peak discharge of 420 m3s-1 (volume of >2.0 × 106 m3) in 2004 in the Nahal Ashalim catchment (75 km2) in the hyperarid Dead Sea region were comparatively analyzed. The two floods, which

  6. Elevations and discharges produced by a simulated flood wave on the lower Sabine River, Louisiana and Texas, caused by a theoretical dam failure

    USGS Publications Warehouse

    Neely, Braxtel L.; Stiltner, Gloria J.

    1979-01-01

    The Toledo Bend Reservoir is located on the lower Sabine River between Louisiana and Texas. Two mathematical models were coupled to calculate the flood wave that would result from the theoretical failure of 25 percent of Toledo Bend Dam and route the wave downstream to Orange, Tex. Computations assumed failure (1) at the peak of the 100-year flood when discharge of the Sabine River is 102,000 cubic feet per second and (2) when the average discharge is 10,000 cubic feet per second. Two techniques were used in the dam-break model. The method of characteristics was used to propagate the shock wave following dam failure. The linear implicit finite-difference solution was used to route the flood wave following shock wave dissipation. The magnitude of the flow was determined for Burkeville, Bon Wier, Ruliff, and Orange, Tex., along the lower Sabine River. For these sites, respectively, the following peak elevations were calculated: 119, 82, 31, and 13 feet for the 100-year flood and 110, 75, 27, and 9 feet for the average discharge. (Woodard-USGS)

  7. WinDAM C earthen embankment internal erosion analysis software

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Two primary causes of dam failure are overtopping and internal erosion. For the purpose of evaluating dam safety for existing earthen embankment dams and proposed earthen embankment dams, Windows Dam Analysis Modules C (WinDAM C) software will simulate either internal erosion or erosion resulting f...

  8. A physically-based method for predicting peak discharge of floods caused by failure of natural and constructed earthen dams

    Microsoft Academic Search

    JOSEPH S. WALDER; JOHN E. COSTA

    We analyse a simple, physically-based model of breach formation in natural and constructed earthen dams to elucidate the principal factors controlling the flood hydrograph at the breach. Formation of the breach, which is assumed trapezoidal in cross-section, is parameterized by the mean rate of downcutting, k, the value of which is constrained by observations. A dimensionless formulation of the model

  9. Dam Safety and Nonstructural Damage Reduction Measures

    Microsoft Academic Search

    Wayne J. Graham; Chih Ted Yang

    1996-01-01

    This article provides a brief description of the dam failure history of the United States, The evolution of U.S. Bureau of Reclamation practice on dam safety has gradually changed from structural to nonstructural measures. A systematic analysis of factors influencing loss of life resulting from dam failure is made in this article. Nonstructural measures such as the preparation of inundation

  10. Debris flows from failures Neoglacial-age moraine dams in the Three Sisters and Mount Jefferson wilderness areas, Oregon

    USGS Publications Warehouse

    O'Connor, J. E.; Hardison, J.H.; Costa, J.E.

    2001-01-01

    The highest concentration of lakes dammed by Neoglacial moraines in the conterminous United States is in the Mount Jefferson and Three Sisters Wilderness Areas in central Oregon. Between 1930 and 1980, breakouts of these lakes have resulted in 11 debris flows. The settings and sequences of events leading to breaching and the downstream flow behavior of the resulting debris flows provide guidance on the likelihood and magnitude of future lake breakouts and debris flows.

  11. Debris flow from 2012 failure of moraine-dammed lake, Three Fingered Jack volcano, Mount Jefferson Wilderness, Oregon

    USGS Publications Warehouse

    Sherrod, David R.; Wills, Barton B.

    2014-01-01

    The Three Fingered Jack debris flow is one of several that have issued from moraine-dammed lakes in the Oregon Cascade Range. A thorough summary of those lakes and the hazards associated with them was published in 2001, based largely on fieldwork by Jim O’Connor and Jasper Hardison in the early 1990s. Described here are details of the 2012 event, an update to the O’Connor story begun earlier.

  12. Flood wave attenuation by a wetland following a beaver dam failure on a second order boreal stream

    Microsoft Academic Search

    Graham R. Hillman

    1998-01-01

    On June 8 1994, a beaver dam on Rocky Creek, a small stream in central Alberta, failed and released about 7500 m3 of water. The estimated peak of the resulting flood wave was 15 m3 s?1, which is 3.5 times the maximum discharge recorded for the creek over 23 years. The flood wave destroyed five hydrometric\\u000a stations, scoured some channel

  13. The 26 May 1982 breakout flows derived from failure of a volcanic dam at El Chichón, Chiapas, Mexico

    USGS Publications Warehouse

    Macias, J.L.; Capra, L.; Scott, K.M.; Espindola, J.M.; Garcia-Palomo, A.; Costa, J.E.

    2004-01-01

    The eruptions of El Chicho??n between 28 March and 4 April 1982 produced a variety of pyroclastic deposits. The climactic phase, on 3 April at 07:35 (4 April at 01:35 GMT), destroyed the central andesitic dome and fed pyroclastic surges and flows that dammed nearby drainages, including the Magdalena River. By late April, a lake had formed, 4 km long and 300-400 m wide, containing a volume of 26 ?? 106 m3 of hot water. At 01:30 on 26 May, the pyroclastic dam was breached and surges of sediment and hot water soon inundated the town of Ostuaca??n, 10 km downstream. This hot flood was finally contained at Pen??itas Hydroelectric Dam, 35 km downstream, where one fatality occurred and three workers were badly scalded. Stratigraphic and sedimentologic evidence indicates that the rapidly draining lake initially discharged two debris flows, followed by five smaller debris flows and water surges. The main debris flows became diluted with distance, and by the time they reached Ostuaca??n, they merged into a single hyperconcentrated flow with a sediment concentration of ???30 vol%. Deposits from this hyperconcentrated flow were emplaced for 15 km, as far as the confluence with another river, the Mas-Pac, below which the flow was diluted to sediment-laden streamflow. The minimum volume of the breakout-flow deposits is estimated at 17 ?? 106 m3. From high-water marks, flow profiles, and simulations utilizing the DAMBRK code from the National Weather Service, we calculated a maximum peak discharge of 11,000 m3/s at the breach; this maximum peak discharge occurred 1 h after initial breaching. The calculations indicated that ???2 h were required to drain the lake.

  14. 30 CFR 56.20010 - Retaining dams.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  15. 30 CFR 57.20010 - Retaining dams.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  16. 30 CFR 56.20010 - Retaining dams.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  17. 30 CFR 56.20010 - Retaining dams.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  18. 30 CFR 56.20010 - Retaining dams.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  19. 30 CFR 57.20010 - Retaining dams.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  20. 30 CFR 57.20010 - Retaining dams.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  1. 30 CFR 56.20010 - Retaining dams.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  2. 30 CFR 57.20010 - Retaining dams.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  3. 30 CFR 57.20010 - Retaining dams.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

  4. Dam Impacts

    NSDL National Science Digital Library

    Integrated Teaching and Learning Program,

    While the creation of a dam provides many benefits, it can have negative impacts on local ecosystems. Students learn about the major environmental impacts of dams and the engineering solutions used to address them.

  5. Dam Forces

    NSDL National Science Digital Library

    Integrated Teaching and Learning Program and Laboratory,

    Students learn how the force of water helps determine the size and shape of dams. They use clay to build models of four types of dams, and observe the force of the water against each type. They conclude by deciding which type of dam they, as Splash Engineering engineers, will design for Thirsty County.

  6. Institute for Water Resources, US Army Corps of Engineers Australian National Committee on Large Dams

    E-print Network

    Bowles, David S.

    Committee on Large Dams LIFESim: A Model for Estimating Dam Failure Life Loss DRAFT by Maged A. Aboelata ABSTRACT Catastrophic events such as dam failures or severe floods are considered to be of low probability linked circumstances surrounding historical dam failure events to actual loss of life and produced

  7. Minimizing losses from an earthen dam breach

    SciTech Connect

    Singh, K.P. (Illinois State Water Survey, Champaign, IL (United States))

    1991-06-01

    The prospect of a dam breach is universally feared by dam owners. In many cases, a failure would lead to water rising many feet above the 100-yr flood plain downstream, with the likelihood of life and property losses. The state of Illinois has identified four important parameters involved in dam breach. By recognizing and analyzing the roles played by these parameters at a specific dam site, engineers can do a better job of designing and constructing a new earthen dam, or rehabilitating and then operating and maintaining an existing structure to reduce the magnitude of flooding and the resulting losses in case of a dam breach.

  8. Probable hydrologic effects of a hypothetical failure of Mackay Dam on the Big Lost River valley from Mackay, Idaho, to the Idaho National Engineering Laboratory

    Microsoft Academic Search

    L. Druffel; G. J. Stiltner; T. N. Keefer

    1979-01-01

    Mackay Dam is an irrigation reservoir on the Big Lost River, Idaho, approximately 7.2 kilometers northwest of Mackay, Idaho. Consequences of possible rupture of the dam have long concerned the residents of the river valley. The presence of reactors and of a management complex for nuclear wastes on the reservation of the Idaho National Engineering Laboratory (INEL), near the river,

  9. 106. DAM EARTH DIKE SUBMERSIBLE DAMS & DIKE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    106. DAM - EARTH DIKE - SUBMERSIBLE DAMS & DIKE CONN. AT MOVABLE DAM (ML-8-52/2-FS) March 1940 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississippi River near Houston County, MN, Genoa, Vernon County, WI

  10. Hydroelectric Dams

    NSDL National Science Digital Library

    Leske, Cavin.

    2002-01-01

    Although hydroelectric power represents a relatively small portion of the world's energy resources, it is still an important commodity with great potential. To harness hydropower, civil engineers must design dams that convert the kinetic energy of water into electricity.The fundamentals of general-use dams are discussed on the home page of the US Society on Dams (1). Besides providing brief background information, there are a few examples of the benefits of dams to society. For a much more technical perspective, check out the Hydropower Program of the US Department of Energy (2). This site examines (among other things) research and development and turbine systems used in hydropower operations. There are several reports available for download, many of which deal with improved technology that minimizes environmental hazards. A good place for grade school students to learn about dams is at National Geographic's Geoguide Web site (3). On the main page, the user can learn about different stages of development in dam construction. A section for classroom and family activities suggests many fun, educational projects that are suitable for kindergarten through high school. The Hydroelectric Design Center (see #4 above for URL) is part of the Army Corps of Engineers. The center's home page has a lot of information about hydropower projects with which it is involved, as well as descriptions of processes and components of a hydropower plant. Possibly the most famous dam in North America is the Hoover Dam (5). History, articles, functional descriptions, pictures, and other media are on the Hoover Dam Web site. A sharp contrast to the glory of the Hoover Dam is the Three Gorges Dam project in China (6). If it is completed, it will be the biggest dam on Earth; however, environmental concerns plague the project with controversy. This Web site outlines the enormous scale of the project and explains the possible benefits and disastrous consequences that may result. The Three Gorges Dam is the subject of a great activity for middle school students at DiscoverySchool.com (7). The activity is set up as a detailed lesson plan that lets teachers introduce the problems and benefits of the dam; additionally, basic engineering concepts are discussed. Hydropower could mean more than just electricity for the Lao People's Democratic Republic, a small country in Indochina where poverty is widespread. The Nam Theun 2 hydroelectric project (8) could bring substantial revenues from exported electricity.

  11. 14. Credit PED. Downstream elevation, near completion, showing tail race ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. Credit PED. Downstream elevation, near completion, showing tail race and trestle used to carry excavated rock and construction materials across tail race. Photo c. 1909. - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

  12. Results -Sunny Day Failure Case -4 -3 -2 -1 0 1 2

    E-print Network

    Bowles, David S.

    Time(hr) %ofPar %Warned %Mobilized %Loss of Life %Warned %Mobilized %Loss of Life Dam failure time Solid Decisiontonotify Detection Failure Notification TimelineforDam Par A1elevation range Decisiontowarn Dam Emergency dam failure or natural floods for use in dam safety risk assessment and emergency planning. Sponsors

  13. A proactive approach to sustainable management of mine tailings

    NASA Astrophysics Data System (ADS)

    Edraki, Mansour; Baumgartl, Thomas

    2015-04-01

    The reactive strategies to manage mine tailings i.e. containment of slurries of tailings in tailings storage facilities (TSF's) and remediation of tailings solids or tailings seepage water after the decommissioning of those facilities, can be technically inefficient to eliminate environmental risks (e.g. prevent dispersion of contaminants and catastrophic dam wall failures), pose a long term economic burden for companies, governments and society after mine closure, and often fail to meet community expectations. Most preventive environmental management practices promote proactive integrated approaches to waste management whereby the source of environmental issues are identified to help make a more informed decisions. They often use life cycle assessment to find the "hot spots" of environmental burdens. This kind of approach is often based on generic data and has rarely been used for tailings. Besides, life cycle assessments are less useful for designing operations or simulating changes in the process and consequent environmental outcomes. It is evident that an integrated approach for tailings research linked to better processing options is needed. A literature review revealed that there are only few examples of integrated approaches. The aim of this project is to develop new tailings management models by streamlining orebody characterization, process optimization and rehabilitation. The approach is based on continuous fingerprinting of geochemical processes from orebody to tailings storage facility, and benchmark the success of such proactive initiatives by evidence of no impacts and no future projected impacts on receiving environments. We present an approach for developing such a framework and preliminary results from a case study where combined grinding and flotation models developed using geometallurgical data from the orebody were constructed to predict the properties of tailings produced under various processing scenarios. The modelling scenarios based on the case study data provide the capacity to predict the composition of tailings and the resulting environmental management implications. For example, the type and content of clay minerals in tailings will affect the geotechnical stability and water recovery. Clay content will also influence decisions made for paste or thickened tailings and underground backfilling. It is possible by using an integrated assessment framework to evaluate more alternatives, including the production of additional saleable and benign streams, alternative tailings treatment and disposal, as well as options for reuse, recycling and pre-processing of existing tailings.

  14. Q00906010024 rock check dam

    E-print Network

    00906010024 rock check dam Q00906010025 rock check dam Q00906010021 rock check dam Q00906010022 rock check dam Q00906010027 rock check dam Q00906010026 rock check dam Q00906010018 rock check dam Q00906010023 rock check dam Q00906010011 rock check dam Q00906010008 rock check dam Q00906010007 rock check dam Q

  15. Natural Debris Dams and Debris-Dam Lakes

    NSDL National Science Digital Library

    This site contains information that will help students to realize that in addition to the direct risk from debris flows and debris avalanches, voluminous deposition of volcanic material in valleys commonly forms unstable natural dams by blocking preexisting drainages and that if the size and structural integrity of the blockage is insufficient to hold back the reservoir that will form, catastrophic failure of the dam will result. Such a hazardous situation may persist for months, years, or decades following an eruption. An example is given of Mount St. Helens, where the debris avalanche raised the level of Spirit Lake 64 meters and dammed its natural outlet even higher and lakes formed in the tributaries of Coldwater and Castle Creeks. In addition, the site has links to publications and reports documenting historical landslide dams from around the world.

  16. Development of dam safety management system

    Microsoft Academic Search

    Jesung Jeon; Jongwook Lee; Donghoon Shin

    2009-01-01

    Recently, we can see an increasing amount of dam damage or failure due to aging, earthquakes occurrence and unusual changes in weather. For this reason, dam safety is gaining more importance than ever before in terms of disaster management at a national level. Therefore, the government is trying to come up with an array of legal actions to secure consistent

  17. Potential for seepage erosion of landslide dam

    USGS Publications Warehouse

    Meyer, W.; Schuster, R.L.; Sabol, M.A.

    1994-01-01

    The failure potential of the debris-avalanche dam at Castle Lake near Mount St. Helens, Washington, by three processes of seepage erosion (1) Heave; (2) piping; and (3) internal erosion, is examined. Results indicated that the dam is stable against piping but potentially locally unstable against heave. -from Authors

  18. Predicting Embankment Dam Breach Parameters - A Needs Assessment

    Microsoft Academic Search

    TONY L. WAHL

    Simulation of embankment dam breach events and the resulting floods are crucial to characterizing and reducing threats due to potential dam failures. Development of effective emergency action plans requires accurate prediction of inundation levels and the time of flood wave arrival at a given location. If population centers are located well downstream of a dam, details of the breaching process

  19. WinDAM C earthern embankment internal erosion analysis software

    Technology Transfer Automated Retrieval System (TEKTRAN)

    The USDA has partnered with landowners to build rural flood control dams. Overtopping and internal erosion are the causes of most dam failures. To estimate the peak discharge associated with a dam incident, the USDA-NRCS, -ARS, and Kansas State University have collaboratively developed software. ...

  20. Uncertainties in the predicted number of life loss due to the dam breach floods

    Microsoft Academic Search

    Jong-Seok Lee

    2003-01-01

    Several empirical methods based on the relationship between historical dam failure events and the number of casualty are available\\u000a for estimating the loss of human lives resulting from dam failure. However, none of the empirical methods can seamlessly predict\\u000a the number of casualties caused by a dam failure, because the characteristics of dam breach flood, warning time, human response\\u000a to

  1. SIMULATION TIGRIS RIVER FLOOD WAVE IN MOSUL CITY DUE TO A HYPOTHETICAL MOSUL DAM BREAK

    Microsoft Academic Search

    Thair M. Al-Taiee; Anass M. M. Rasheed

    Mosul dam is one of the biggest hydraulic structures in Iraq. It is located on Tigris River north Iraq and was selected as a case study to predict flood disasters caused by a hypothetical Mosul dam failure due to its foundation defect in which the dam had been survive since 1986 (initial time of dam operation). It is an earth-fill

  2. Providing protection: Agencies receive funding to repair, upgrade dams 

    E-print Network

    Wythe, Kathy

    2009-01-01

    hazard ratings, depending on the potential damage or loss of life should failure occur, said Richard Egg, TSSWCB statewide programs engineer. Most were built as low hazard dams in rural areas. ?Many dams originally constructed as low hazard are now... being reclassified as high hazard because of population growth and urban development downstream,? Egg said. With the change in classification, the dams need rehabilitation to meet more stringent design criteria to prevent potential failure during...

  3. V00306010057 rock check dam

    E-print Network

    ¬« ¬« ¬« ¬« ¬« XY! 16-020 16-030(c) 16-026(l) 16-028(c) 16-026(l) V00306010057 rock check dam V00306010012 rock check dam V00306010040 rock check dam V00306010039 rock check dam V00306010058 rock check dam V00306010064 rock check dam V00306010061 rock check dam V00306010062 rock check dam V00306010063

  4. Dynamic Interaction of Concrete Dam-Reservoir-Foundation: Analytical and Numerical Solutions

    Microsoft Academic Search

    George Papazafeiropoulos; Yiannis Tsompanakis; Prodromos N. Psarropoulos

    \\u000a The majority of concrete dams worldwide have behaved relatively well during seismic events. However, there are several cases\\u000a where global failure or substantial damages have occurred. The need for new dam construction and retrofitting of existing\\u000a dams necessitates the use of advanced design approaches that can take realistically into account the potential dam-reservoir-foundation\\u000a interaction. Seismic design of concrete dams is

  5. Engineers find climbing techniques work well for dam inspections

    SciTech Connect

    O`Shea, M.; Graves, A. [Bureau of Reclamation, Denver, CO (United States)

    1996-10-01

    Climbing techniques adopted by the Bureau of Reclamation to inspect previously inaccessible or difficult to reach features at dams are described. Following the failure of the steel radial-arm gate at Folsom Dam, engineers mounted an effort to reach and inspect the dam`s seven other spillway gates. This close-up examination was performed to: (1) determine the condition of these gates; and (2) gather clues about the failure of the one gate. The access techniques described involved mountaineering techniques, as opposed to high scaling techniques, performed with dynamic and static nylon kermantle ropes.

  6. Enhancing the safety of tailings management facilities

    SciTech Connect

    Meggyes, T.; Niederleithinger, E.; Witt, K.J.; Csovari, M.; Kreft-Burman, K.; Engels, J.; McDonald, C.; Roehl, K.E. [BAM, Berlin (Germany). Federal Institute for Material Research & Testing

    2008-07-01

    Unsafe tailings management facilities (TMFs) have caused serious accidents in Europe threatening human health/life and the environment. While advanced design, construction and management procedures are available, their implementation requires greater emphasis. An integrated research project funded by the European Union was carried out between 2002 and 2005 with the overall goal of improving the safety of TMFs (Sustainable Improvement in Safety of Tailings Facilities - TAILSAFE, http://www.tailsafe.com/). The objective of TAILSAFE was to develop and apply methods of parameter evaluation and measurement for the assessment and improvement of the safety state of tailings facilities, with particular attention to the stability of tailings dams and slurries, the special risks inherent when such materials include toxic or hazardous wastes, and authorization and management procedures for tailings facilities. Aspects of tailings facilities design, water management and slurry transport, non-destructive and minimally intrusive testing methods, monitoring and the application of sensors, intervention and remediation options were considered in TAILSAFE. A risk reduction framework (the TAILSAFE Parameter Framework) was established to contribute to the avoidance of catastrophic accidents and hazards from tailings facilities. Tailings from the mining and primary processing of metals, minerals and coal were included within the scope of TAILSAFE. The project focused on the avoidance of hazards by developing procedures and methods for investigating and improving the stability of tailings dams and tailings bodies.

  7. Integrated Dam Assessment Models Towards Sustainability of Dams

    E-print Network

    Tullos, Desiree

    Integrated Dam Assessment Models ­ Towards Sustainability of Dams Desiree Tullos, Bryan Tilt, Phil Brown, Darrin Magee, and Aaron Wolf #12;Costs and benefits of dams "Dams have made an important, and by the natural environment" (WCD 2000) #12;Dams in, out, and reoperated #12;Dams out: Dam removal in America

  8. Using historic aerial photography and paleohydrologic techniques to assess long-term ecological response to two Montana dam removals

    Microsoft Academic Search

    Denine Schmitz; Matt Blank; Selita Ammondt; Duncan T. Patten

    2009-01-01

    The restorative potential of dam removal on ecosystem function depends on the reversibility of dam effects and its operations. While dam removal is an established engineering practice, the need for an understanding of the ecological response remains. We used paleoflood hydrology, hydrologic modeling, and aerial photo interpretation to investigate the long-term ecologic responses to dam failure and breach. We investigated

  9. Using historic aerial photography and paleohydrologic techniques to assess long-term ecological response to two Montana dam removals

    Microsoft Academic Search

    Denine Schmitz; Matt Blank; Selita Ammondt; Duncan T. Patten

    2008-01-01

    The restorative potential of dam removal on ecosystem function depends on the reversibility of dam effects and its operations. While dam removal is an established engineering practice, the need for an understanding of the ecological response remains. We used paleoflood hydrology, hydrologic modeling, and aerial photo interpretation to investigate the long-term ecologic responses to dam failure and breach. We investigated

  10. The formation and breach of a short-lived landslide dam at Hsiaolin village, Taiwan — part I: Post-event reconstruction of dam geometry

    Microsoft Academic Search

    Jia-Jyun Dong; Yun-Shan Li; Chyh-Yu Kuo; Rui-Tang Sung; Ming-Hsu Li; Chyi-Tyi Lee; Chien-Chih Chen; Wang-Ru Lee

    2011-01-01

    In this paper, technologies from multiple disciplines are used to reconstruct the shape of the Hsiaolin landslide dam, a short-lived landslide dam (SLD), that was triggered by Typhoon Morakot. Here, the formation, failure mode and breaching process of this SLD are investigated. The results indicate that the overtopping time and the debris budget constrained the dam geometry. The inferred volume

  11. V01406010015 rock check dam

    E-print Network

    XY! ¬« ¬« V01406010015 rock check dam V01406010014 rock check dam V01406010013 rock check dam 1501403010012 earthen berm V01403010008 earthen berm V01406010003 rock check dam V01406010004 rock check dam V01406010010 rock check dam V01406010011 rock check dam 15-0651 15-0307 15-0588 15-0532 15-0575 stormdrain 7160

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

    PubMed Central

    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

  13. 49. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    49. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM -- DAM CONCRETE -- TYPICAL PIER ISOMETRIC. M-L 26(R) 40/1 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26R, Alton, Madison County, IL

  14. CRIB DAM, LOOKING ALONG DAM FROM WEST ABUTMENT, SHOWING PLANK ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    CRIB DAM, LOOKING ALONG DAM FROM WEST ABUTMENT, SHOWING PLANK SHEATHING IN FOREGROUND. VIEW TO EAST - Kachess Dam, 1904 Cascade Canal Company Crib Dam, Kachess River, 1.5 miles north of Interstate 90, Easton, Kittitas County, WA

  15. 50. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    50. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM -- DAM CONCRETE -- GENERAL ARRANGEMENT -- SECTION AND ELEVATIONS. M-L 26(R) 40/3 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26R, Alton, Madison County, IL

  16. Geophysical methods for the assessment of earthen dams

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Dams and levees are an integral part of the fluvial system in watersheds. Their stability is of utmost concern to the Nation and to those directly impacted should failure occur. There are some 88,000 dams and 110,000 miles of levees in the USA. Many of those are earthen embankments and structures su...

  17. Are Dams Forever?

    NSDL National Science Digital Library

    Integrated Teaching and Learning Program and Laboratory,

    Students learn that dams do not last forever. Similar to other human-made structures, such as roads and bridges, dams require regular maintenance and have a finite lifespan. Many dams built during the 1930-70s, an era of intensive dam construction, have an expected life of 50-100 years. Due to inadequate maintenance and/or for environmental reasons, some of these dams will fail or be removed in the next 50 years. The engineers with Splash Engineering have an ethical obligation to remind Thirsty County of the maintenance and lifespan concerns associated with its dam.

  18. Elastoplastic Effective Stress Analysis of Centrifugal Shaking Tests of a Rockfill Dam

    Microsoft Academic Search

    T. Iwashita

    No earthquake has caused failure or severe damage to any rockfill dams with bodies of wellcompacted r ock materials. It is important to estimate the damage grade quantitatively in order to evaluate a seismic performance of a dam against a large earthquake. A centrifugal shaking model test of a rockfill dam was performed under centrifugal force field of 50g to

  19. Peak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA

    E-print Network

    Peak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA Cassandra R Received 6 May 2005 Availble online 7 February 2006 Abstract The failure of a lava dam 165,000 yr ago produced the largest known flood on the Colorado River in Grand Canyon. The Hyaloclastite Dam was up to 366

  20. Garrison Dam and Spillway

    USGS Multimedia Gallery

    Looking to the southwest at the Garrison Dam Spillway located to the left in this picture and the Garrison Dam located to the right in this picture. Photo taken by USGS personnel on a Civil Air Patrol flight....

  1. T00406010008 rock check dam

    E-print Network

    XY! ¬« T00406010008 rock check dam T00406010009 rock check dam T00406010010 rock check dam T00406010011 rock check dam T-SMA-2.85 0.344 Acres 35-014(g) 35-016(n) T00406010005 rock check dam T00406010006 rock check dam T00403090004 curb T00402040007 established vegetation, green hatch area 7200 7200 7180

  2. J00206010020 rock check dam

    E-print Network

    XY! J00206010020 rock check dam J00206010023 rock check dam 09-009 09-009 09-009 PJ-SMA-2 0.901 Acres J00206010021 rock check dam J00206010019 rock check dam J00206010014 rock check dam J00203010007 Smith DATE: 14-November-2014 REVISION NUMBER: 8 XY! IP sampler location Berm Channel/swale Check dam

  3. W02106010008 rock check dam

    E-print Network

    W-SMA-14.1 5.169 Acres W02106010008 rock check dam W02106010009 rock check dam W02106010010 rock check dam W02106010011 rock check dam W02106010012 rock check dam W02103010018 earthen berm W02103010016 dam Established vegetation Seed and mulch Sediment trap/basin Gabion Cap SWMU boundary SMA drainage

  4. Engineer a Dam

    NSDL National Science Digital Library

    IEEE

    2014-05-22

    In this activity, learners explore the function and engineering of dams and how dams have many uses and solve many problems in the world. Learners work in teams to engineer their own dam structure in a water trough that has the ability to release water in a controlled manner, as might be used in irrigation. Learners present their plans, execute and test their dams, and reflect on the experience.

  5. Small-dam rehabs

    SciTech Connect

    Denning, J.

    1993-01-01

    This article examines the economics of maintenance, rehabilitation and improvement for small, aging, high-hazard dams. The topics of the article include raising the height of the spillway and repairing deteriorated concrete in the spillway of Fellows Lake Dam, emergency repair of the outlet conduit and replacement of riprap on the upstream slope of Storrie Lake Dam, and extensive rehabilitation of Reeves Lake Dam.

  6. Hoover Dam Learning Packet.

    ERIC Educational Resources Information Center

    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…

  7. 106. Photocopied August 1978. EXTENSION OF TAIL PIT WALLS, APRIL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    106. Photocopied August 1978. EXTENSION OF TAIL PIT WALLS, APRIL 28, 1917. THE TIMBERWORK IN THE FOREGROUND WAS USED AS A COMBINATION COFFER DAM AND FORM FOR POURING THE CONCRETE TAIL RACE WALL EXTENSION. IN THE BACKGROUND ALONG THE POWER HOUSE SEVERAL COMPLETED WALL EXTENSIONS CAN BE SEEN DIMLY. (787) - Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie, Chippewa County, MI

  8. EARTHEN & CONCRETE DAMS

    NSDL National Science Digital Library

    Professor Darin Taylor

    2005-11-17

    Civil Engineers will work on a wide variety of projects. One area that they may specialize in is Earthen and Concrete Dams. As a civil drafter you may find yourself working on one of these massive projects. This instructional unit will give you a basic introduction to the many different types of dams and how they are constructed. Lets begin by introducing you to the basic terminology and design structures of a dam. The following link will help you in gaining a basic knowledge of these amazing structures. Learn About Dams Even though you now have a basic understanding of dams, you are still a long ways away from being an ...

  9. Stability analysis of White Oak Dam

    SciTech Connect

    NONE

    1995-04-11

    White Oak Dam is located in the White Oak Creek watershed which provides the primary surface drainage for Oak Ridge National Laboratory. A stability analysis was made on the dam by Syed Ahmed in January 1994 which included an evaluation of the liquefaction potential of the embankment and foundation. This report evaluates the stability of the dam and includes comments on the report prepared by Ahmed. Slope stability analyses were performed on the dam and included cases for sudden drawdown, steady seepage, partial pool and earthquake. Results of the stability analyses indicate that the dam is stable and failure of the structure would not occur for the cases considered. The report prepared by Ahmed leads to the same conclusions as stated above. Review of the report finds that it is complete, well documented and conservative in its selection of soil parameters. The evaluation of the liquefaction potential is also complete and this report is in agreement with the findings that the dam and foundation are not susceptible to liquefaction.

  10. Animal Tails

    NSDL National Science Digital Library

    Sohmer, Rachel.

    2003-01-01

    Call it tail envy. With only a vestigial nub to show for ourselves, perhaps it's no wonder that animal tails capture our attention. The following Web sites present some of the more interesting tails to be found in the animal kingdom. The first Web site contains a recent article from Discovery News describing new findings that at least one species of scorpion produces two distinct types of tail venom, which have completely different effects on their victims (1). The next site from Singapore Zoological Gardens introduces the cebids (our New World monkey cousins), some of which have amazing prehensile tails that are used like a fifth limb (2). The rattlesnake is another famously-tailed creature, highlighted in the following site from the Arizona-Sonora Desert Museum (3). The site covers the main aspects of rattlesnake natural history, including a section on how the rattle forms. The Great Plains Nature Center in Wichita, Kansas, offers a Web page devoted to the beaver, including tail trivia and an audio clip of a resident beaver surprised in his den at the Kansas Wildlife Exhibit (4). Anyone who has witnessed the freakishly fascinating spectacle of a gecko leaving its tail behind to distract a would-be predator will appreciate this brief bio of the Tokay gecko, presented by ReptileCenter.com, the Herpetologist's Portal (5). Stacy's Wag'N'Train -- offering dog-training classes in San Jose, California -- provides this online guide to dog body language, which would have a very limited vocabulary without the tail (6). So, how did the peacock get its tail? It's a simple question that has driven zoologists crazy for over a century. The next Web site (7) contains an in-depth article on the subject from the Independent (London), offered through National Geographic News. And finally, the bizarre gulper eel -- able to tie its tail in several knots -- gets is own Web page on Pangea, the Web server for the Department of Educational Leadership and Technology at Southeastern Louisiana University (8). This deep-sea curiosity uses its bioluminescent tail tip to lure hapless prey into its impossibly gigantic mouth.

  11. 16. Parker Dam, only top fourth of dam visible, at ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. Parker Dam, only top fourth of dam visible, at 320' high, Parker Dam is one of the highest in the world. Much of this height is because dam penetrates well below river bottom to fasten to bedrock. - Parker Dam, Spanning Colorado River between AZ & CA, Parker, La Paz County, AZ

  12. Using historic aerial photography and paleohydrologic techniques to assess long-term ecological response to two Montana dam removals.

    PubMed

    Schmitz, Denine; Blank, Matt; Ammondt, Selita; Patten, Duncan T

    2009-07-01

    The restorative potential of dam removal on ecosystem function depends on the reversibility of dam effects and its operations. While dam removal is an established engineering practice, the need for an understanding of the ecological response remains. We used paleoflood hydrology, hydrologic modeling, and aerial photo interpretation to investigate the long-term ecologic responses to dam failure and breach. We investigated downstream geomorphic and vegetation responses to a dam failure (Pattengail Dam in 1927) and a controlled dam breach, which used natural sediment removal (Mystic Lake Dam in 1985). Our data showed vegetation responses indicative of channel and floodplain evolution at Pattengail. The size of the flood following the Pattengail dam failure initiated a series of channel adjustments and reworked over 19ha of floodplain downstream of the dam. In Mystic, we observed few flood stage indicators and a slight response in floodplain vegetation. We made several findings. (1) Dam removal effects on channel evolution and floodplain development depend on reach types and their responsiveness to flow regime change. (2) Ecologic response to dam removal depends on the sizes and timing of high flow events during and following removal. (3) Paleohydrology can be used to assess historic floods (>20 years). We see the utility of assessing the ecological responsiveness of a system to previous fluvial events or changes in flow regime. Informed about the character of a system based on its history, dam removal scientists can use these tools to set realistic restoration goals for removing a dam. PMID:19042079

  13. Tail Buffeting

    NASA Technical Reports Server (NTRS)

    Abdrashitov, G.

    1943-01-01

    An approximate theory of buffeting is here presented, based on the assumption of harmonic disturbing forces. Two cases of buffeting are considered: namely, for a tail angle of attack greater and less than the stalling angle, respectively. On the basis of the tests conducted and the results of foreign investigators, a general analysis is given of the nature of the forced vibrations the possible load limits on the tail, and the methods of elimination of buffeting.

  14. 9. Excavation work at Pleasant Dam (now called Waddell Dam). ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. Excavation work at Pleasant Dam (now called Waddell Dam). Photographer unknown, July, 22, 1926. Source: Maricopa County Municipal Water Conservation District Number One (MWD). - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

  15. Analysis and dynamic modeling of a moraine failure and glacier lake outburst flood at Ventisquero Negro, Patagonian Andes (Argentina)

    E-print Network

    Stoffel, Markus

    Outburst hydrograph s u m m a r y Although moraine dams are inherently prone to failure because and the application of a dynamic dam break model. Results indicate that the moraine failure was caused most probably erosion and finally to dam failure. The lake volume of ca. 10 Â 106 m3 was released in ca. 3 h, producing

  16. PREDICTING UNDERSEEPAGE OF MASONRY DAMS Published in Proceedings of 29th

    E-print Network

    through the soil increases sharply. Unlike a piping failure, erosion does not occur in a heave failure by piping in his work. According to Peck: "Some of the failures in the statistical studies that [Bligh (1934) selected conservative values of safe creep ratios because of the small number of dam failures

  17. GeoGuide: Dams!

    NSDL National Science Digital Library

    The site offers an interactive discussion of different vantage points associated with dam building. It describes some of the engineering and environmental issues that go into the process of selecting a site for building a dam and the conditions necessary for electrical generation. Links to classroom and family activities are organized by grade level.

  18. Dammed or Damned?

    ERIC Educational Resources Information Center

    Hirsch, Philip

    1988-01-01

    Summarizes issues raised at a workshop on "People and Dams" organized by the Society for Participatory Research in Asia. Objectives were to (1) understand problems created by dams for people, (2) consider forces affecting displaced populations and rehabilitation efforts, and (3) gain a perspective on popular education efforts among affected…

  19. Power from yesterday's dams

    Microsoft Academic Search

    1978-01-01

    The potential for hydroelectricity in New England is immense. There are more than 2,800 dams in the six states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut. But only 200 of them produce electricity, many far below their full capacity. At the other 2,600 dams, water simply pours over the top, wasting the potential for efficient use of

  20. Maple River Dam Spillway

    USGS Multimedia Gallery

    The Maple River Dam is a pass-through dam that lets a limited amount of water flow through year round and fills the reservoir only during high flow. If the water rises high enough to fill the reservoir, water flows over the spillway shown in this photo.  Video taken at the same time is availabl...

  1. Cold Air Damming

    NSDL National Science Digital Library

    2014-09-14

    Cold Air Damming is part of the Mesoscale Meteorology Primer series. This module first presents a Navy forecast scenario prior to the development of a major cold air damming (CAD) event along the east slopes of the Appalachian Mountains. Then, from a conceptual standpoint, the classic CAD scenario is described in detail, both from an observational and modeling standpoint.

  2. NEW ENGLAND DAMS

    EPA Science Inventory

    With the National Dam Inspection Act (P.L. 92-367) of 1972, Congress authorized the U.S. Army Corps of Engineers (USACE) to inventory dams located in the United States. The Water Resources Development Act of 1986 (P.L 99-662) authorized USACE to maintain and periodically publish...

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

    NASA Astrophysics Data System (ADS)

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

    2012-10-01

    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 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 insignificant, due to their rather small volumes, which were only 2% of the volume of the Tangjiashan lake. The construction of the spillway was proven to have played a crucial role in reducing the dam-breach flood, because all the other natural breach scenarios would have caused the flooding of the downstream towns and parts of Mianyang city. However, in retrospect improvements on the spillway design and the evacuation planning would have been possible. The dam-break flood risk will be better controlled by reducing the spillway channel gradient and the porosity of the coating of the channel bottom. The experience and lessons we learned from the Tangjiashan case will contribute to improving the hazard mitigation and risk management planning of similar events in future.

  4. Hydraulics of embankment-dam breaching

    NASA Astrophysics Data System (ADS)

    Walder, J. S.; Iverson, R. M.; Logan, M.; Godt, J. W.; Solovitz, S.

    2012-12-01

    Constructed or natural earthen dams can pose hazards to downstream communities. Experiments to date on earthen-dam breaching have focused on dam geometries relevant to engineering practice. We have begun experiments with dam geometries more like those of natural dams. Water was impounded behind dams constructed at the downstream end of the USGS debris-flow flume. Dams were made of compacted, well-sorted, moist beach sand (D50=0.21 mm), 3.5 m from toe to toe, but varying in height from 0.5 to 1 m; the lower the dam, the smaller the reservoir volume and the broader the initially flat crest. Breaching was started by cutting a slot 30-40 mm wide and deep in the dam crest after filling the reservoir. Water level and pore pressure within the dam were monitored. Experiments were also recorded by an array of still- and video cameras above the flume and a submerged video camera pointed at the upstream dam face. Photogrammetric software was used to create DEMs from stereo pairs, and particle-image velocimetry was used to compute the surface-velocity field from the motion of tracers scattered on the water surface. As noted by others, breaching involves formation and migration of a knickpoint (or several). Once the knickpoint reaches the upstream dam face, it takes on an arcuate form whose continued migration we determined by measuring the onset of motion of colored markers on the dam face. The arcuate feature, which can be considered the head of the "breach channel", is nearly coincident with the transition from subcritical to supercritical flow; that is, it acts as a weir that hydraulically controls reservoir emptying. Photogenic slope failures farther downstream, although the morphologically dominant process at work, play no role at all in hydraulic control aside from rare instances in which they extend upstream so far as to perturb the weir, where the flow cross section is nearly self-similar through time. The domain downstream of the critical-flow section does influence the hydrograph in another way: the broader the initial dam crest, the longer the time before critical flow control is established. Flood duration is thus increased but peak discharge is decreased. Visual inspection and overhead videography reveal little turbidity in water pouring over the weir, implying that sediment there moves dominantly as bedload. Furthermore, underwater videography gives the overall impression that along the upstream dam face, erosion occurs without redeposition. Thus it would be a mistake to use empiricisms for equilibrium bedload transport to model erosion of the embankment. In mathematical terms, erosion rate cannot be backed out by calculating the divergence of transport rate; rather, transport rate should be regarded as the spatial integral of erosion rate. We use photogrammetry and motion of the colored markers to determine the erosion rate of the weir, and then infer shear stress at the weir by applying the van Rijn sediment-pickup function. Shear stress determined in this fashion is much less than what one calculates from the gradient of the energy head (an approach appropriate to steady flow). Shear stress inferred from the pickup-function calculation can serve as a constraint on computational fluid-dynamics models. Another constraint on such models, revealed by the underwater videography, is the upstream limit of sand movement, where bed shear stress equals the critical value for sand entrainment.

  5. 1. GORGE HIGH DAM. THIS THIN ARCH DAM WITH A ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. GORGE HIGH DAM. THIS THIN ARCH DAM WITH A GRAVITY SECTION IS THE THIRD DAM BUILT BY SEATTLE CITY LIGHT TO PROVIDE WATER FOR GORGE POWERHOUSE AND WAS COMPLETED IN 1961, 1989. - Skagit Power Development, Gorge High Dam, On Skagit River, 2.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

  6. 14 CFR 29.547 - Main and tail rotor structure.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...false Main and tail rotor structure. 29.547 Section 29...547 Main and tail rotor structure. (a) A rotor is...including a detailed failure analysis to identify all failures...occurrence. (c) The rotor structure must be designed to...

  7. 14 CFR 29.547 - Main and tail rotor structure.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...false Main and tail rotor structure. 29.547 Section 29...547 Main and tail rotor structure. (a) A rotor is...including a detailed failure analysis to identify all failures...occurrence. (c) The rotor structure must be designed to...

  8. 14 CFR 29.547 - Main and tail rotor structure.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...false Main and tail rotor structure. 29.547 Section 29...547 Main and tail rotor structure. (a) A rotor is...including a detailed failure analysis to identify all failures...occurrence. (c) The rotor structure must be designed to...

  9. 14 CFR 29.547 - Main and tail rotor structure.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...false Main and tail rotor structure. 29.547 Section 29...547 Main and tail rotor structure. (a) A rotor is...including a detailed failure analysis to identify all failures...occurrence. (c) The rotor structure must be designed to...

  10. 14 CFR 29.547 - Main and tail rotor structure.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...false Main and tail rotor structure. 29.547 Section 29...547 Main and tail rotor structure. (a) A rotor is...including a detailed failure analysis to identify all failures...occurrence. (c) The rotor structure must be designed to...

  11. Gypsum-karst problems in constructing dams in the USA

    USGS Publications Warehouse

    Johnson, K.S.

    2008-01-01

    Gypsum is a highly soluble rock and is dissolved readily to form caves, sinkholes, disappearing streams, and other karst features that typically are also present in limestones and dolomites. Gypsum karst is widespread in the USA and has caused problems at several sites where dams were built, or where dam construction was considered. Gypsum karst is present (at least locally) in most areas where gypsum crops out, or is less than 30-60 m below the land surface. These karst features can compromise on the ability of a dam to hold water in a reservoir, and can even cause collapse of a dam. Gypsum karst in the abutments or foundation of a dam can allow water to pass through, around, or under a dam, and solution channels can enlarge quickly, once water starts flowing through such a karst system. The common procedure for controlling gypsum karst beneath the dam is a deep cut-off trench, backfilled with impermeable material, or a close-spaced grout curtain that hopefully will fill all cavities. In Oklahoma, the proposed Upper Mangum Dam was abandoned before construction, because of extensive gypsum karst in the abutments and impoundment area. Catastrophic failure of the Quail Creek Dike in southwest Utah in 1989 was due to flow of water through an undetected karstified gypsum unit beneath the earth-fill embankment. The dike was rebuilt, at a cost of US $12 million, with construction of a cut-off trench 600 m long and 25 m deep. Other dams in the USA with severe gypsum-karst leakage problems in recent years are Horsetooth and Carter Lake Dams, in Colorado, and Anchor Dam, in Wyoming. ?? 2007 Springer-Verlag.

  12. Hoover Dam Intake Towers

    USGS Multimedia Gallery

    Hoover Dam impounds Lake Mead and provides drinking water and hydroelectric power to the surrounding area. It was constructed between 1931 and 1936. The Intake Towers are where water enters to generate electricity....

  13. Documented historical landslide dams from around the world

    USGS Publications Warehouse

    Costa, John E.; Schuster, Robert L.

    1991-01-01

    This data compilation consists of dBase IV1 data files of the location, date, triggering mechanism, kind, size, failure time and mechanism, breach dimensions, subsequent controls, materials, and references for 463 historical landslide dams and associated natural reservoirs that have been recorded throughout the World. The data base presented in this report is a compilation of information on the characteristics of 463 landslide dams from around the World. It forms a basis on which to assess potential threats from existing landslide dams, or newly-formed landslide dams. The data base includes only landslide dams that have formed in historical times - that is, those formed during times when humans were able to record their occurrence, and the information transferred through various means of written and/or oral documentation. There have been far more prehistoric landslide dams about which relatively little is known. None of these is included in this data base. The focus on historical landslide dams allows insights into this natural process that will aid in understanding their role as a significant geologic process in recent Earth history.

  14. Lower San Fernando corrugated metal pipe failure

    SciTech Connect

    Bardet, J.P. [Univ. of Southern California, Los Angeles, CA (United States); Davis, C.A. [Los Angeles Dept. of Water and Power, CA (United States)

    1995-12-31

    During the January 17, 1994, Northridge earthquake, a 2.4 m diameter corrugated metal pipe was subjected to 90 m of extensive lateral crushing failure at the Lower San Fernando Dam. The dam and outlet works were reconstructed after the 1971 San Fernando Earthquake. In 1994, the dam underwent liquefaction upstream of the reconstructed berm. The pipe collapsed on the west side of the liquefied zone and a large sinkhole formed over the drain line. The failure of this drain line provides a unique opportunity to study the seismic response of buried drains and culverts.

  15. Garrison Dam and Garrison Dam National Fish Hatchery

    USGS Multimedia Gallery

    The Garrison Dam National Fish Hatchery and Garrison Dam between Pick City and Riverdale, North Dakota. The Garrison Dam National Fish Hatchery is in the bottom left of the photo. Photo taken by USGS personnel on a Civil Air Patrol flight....

  16. 32. AERIAL VIEW OF TIETON DAM, UPSTREAM FACE OF DAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    32. AERIAL VIEW OF TIETON DAM, UPSTREAM FACE OF DAM (Trashrack-structure for outlet at lower left in reservoir, spillway at upper left. Reservoir nearly empty due to drought.) - Tieton Dam, South & East of State Highway 12, Naches, Yakima County, WA

  17. d:\\activepdf\\uploadfolder\\$asq1rr04-4144-212200461042pm.doc Page 1 Erosional narrowing after dam removal: Theory and numerical model

    E-print Network

    Parker, Gary

    of a dam that is filled with sediment. A channel incises into the deposit after failure of the leadingd:\\activepdf\\uploadfolder\\$asq1rr04-4144-212200461042pm.doc Page 1 Erosional narrowing after dam phenomenon herein called "erosional narrowing". This occurs immediately after the sudden removal of a dam

  18. 1. OVERALL VIEW OF SPILLWAY SHOWING BAFFLE WALL AND TAIL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. OVERALL VIEW OF SPILLWAY SHOWING BAFFLE WALL AND TAIL WATERS, WITH POWERHOUSE (MI-98-C) AND SUBSTATION (MI-98-D) AT LEFT. VIEW TO SOUTH. - Cooke Hydroelectric Plant, Spillway, Cook Dam Road at Au Sable River, Oscoda, Iosco County, MI

  19. Risk assessment for large Romanian dams situated on Bistrita and Siret Rivers

    NASA Astrophysics Data System (ADS)

    Moldovan, Iren-Adelina; Petruta Constantin, Angela; Popescu, Emilia; Toma-Danila, Dragos; Otilia Placinta, Anica

    2015-04-01

    The work will present an ongoing national Project that have as final goal to provide 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. Probabilistic seismic hazard (PSH), vulnerability and risk studies in 6 counties from Moldova region including Izvorul Muntelui Dam, down on Bistrita and following on Siret River and theirs affluent will be accomplished during the project. A number of 5 large dams (the most vulnerable) will be studied in detail and flooding maps will be drawn to find the most exposed downstream localities both for risk assessment studies and warnings. The results will consist in local and regional seismic information, dams specific characteristics and locations, seismic hazard maps and risk classes, for all dams sites (for more than 30 dams), inundation maps (for the most vulnerable 5 dams from the region) and possible affected localities. The maps will provide the best available estimate of the general location and extent of dam failure inundation areas and will tell if a specific location lies within a dam failure inundation zone. Besides periodical technical inspections, the monitoring and the surveillance of dams' related structures and infrastructures, there are some more seismic specific requirements towards dams' safety. The most important one is the seismic risk assessment that can 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 the dams site. In this paper we will obtain the ground motion parameters in the dams locations using probabilistic hazard assessment techniques, the structures vulnerability and the downstream risk characteristics (human, economical, historic and cultural heritage, etc) in the areas that might be flooded in the case of a dam failure, and will compute the risk factor for the most exposed dams in the area. This work is partially supported by the Partnership in Priority Areas Program - PNII, under MEN-UEFISCDI, DARING Project no. 69/2014 and NUCLEU project, PN 09 30/2009.

  20. Wim van Dam CURRICULUM VITAE

    E-print Network

    California at Santa Barbara, University of

    Wim van Dam CURRICULUM VITAE Department of Computer Science Work: +1-805-893 5211 Harold Frank Hall in physics. #12;Curriculum Vitae Wim van Dam, June 2008 2 PUBLICATIONS Journal and Conference Articles [1] "Quantum Algorithms for Algebraic Problems", Andrew M. Childs and Wim van Dam, to appear in Reviews

  1. Reverse Oxidation Zoning in Mine Tailings Generating Arsenic-rich Acidic Waters (Carnoulès, France)

    Microsoft Academic Search

    Kouadio Koffi; Marc Leblanc; Hervé Jourde; Corinne Casiot; Séverin Pistre; Philippe Gouze; Françoise Elbaz-Poulichet

    2003-01-01

    .   The Carnoulès Pb mine closed 40 years ago, leaving tailings (pyrite-rich silts) exposed. In 1982, the tailings were gathered\\u000a and placed behind a concrete dam, above a drainage pipe, and then covered with a clay layer. The As-rich pyrite in the tailings\\u000a has oxidized; acidic water with high As concentrations (100–350 mg\\/L As) now emerges from the base of

  2. EARTH DAM OR SPILLWAY?

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Aging of the US water control and management infrastructure is increasing the likelihood that some dams will be overtopped during extreme floods. As structures approach their planned service life, sediment pools fill and continued sedimentation results in a reduction in the volume available for flo...

  3. The Formation and Behaviour of Natural and Artificial Rockslide Dams; Implications for Engineering Performance and Hazard Management

    Microsoft Academic Search

    Stephen G. Evans; Keith B. Delaney; Reginald L. Hermanns; Alexander Strom; Gabriele Scarascia-Mugnozza

    \\u000a The formation and behaviour of natural and artificial rockslide dams are reviewed to update the well-known work of Costa and\\u000a Schuster [1]. Rockslide dams block surface drainage to form upstream lakes. They may occur naturally due to landslides or\\u000a as a result of engineered rock slope failure. As evidenced by the 2010 Hunza event (Pakistan), the stability of rockslide\\u000a dams

  4. Piping flow erosion in water retaining structures: inferring erosion rates from hole erosion tests and quantifying the failure time

    E-print Network

    Paris-Sud XI, Université de

    parameters of piping failure: the coefficient of erosion, and the maximum pipe diameter prior to roof (earth-dams, dykes, levees) result from overtopping and piping. The breach due to failure generates, the statistics of failure of embankment dams indicates that improvement in the understanding of piping

  5. Geomorphic and Ecological Issues in Removal of Sediment-Filled Dams in the California Coast Ranges (Invited)

    NASA Astrophysics Data System (ADS)

    Kondolf, G. M.; Oreilly, C.

    2010-12-01

    Water-supply reservoirs in the actively eroding California Coast Ranges are vulnerable to sediment filling, thus creating obsolete impounding dams (Minear & Kondolf 2009). Once full of sediment, there is more impetus to remove dams for public safety and fish passage, but managing accumulated sediments becomes a dominant issue in dam removal planning. We analyzed the planning process and sediment management analyses for five dams, all of which have important ecological resources but whose dam removal options are constrained by potential impacts to downstream urban populations. Ringe Dam on Malibu Ck, Matilija Dam on the Ventura River, Searsville Dam on San Francisquito Ck, and Upper York Creek Dam on York Ck cut off important habitat for anadromous steelhead trout (Oncorhynchus mykiss). San Clemente Dam on the Carmel River has a working fish ladder, but only some of the migratory steelhead use it. By virtue of having filled with sediment, all five dams are at greater risk of seismic failure. San Clemente Dam is at greater risk because its foundation is on alluvium (not bedrock), and the poor-quality concrete in Matilija Dam is deteriorating from an akali-aggregate reaction. Simply removing the dams and allowing accumulated sediments to be transported downstream is not an option because all these rivers have extremely expensive houses along downstream banks and floodplains, so that allowing the downstream channel to aggrade with dam-dervied sediments could expose agencies to liability for future flood losses. Analyses of potential sediment transport have been based mostly on application of tractive force models, and have supported management responses ranging from in-situ stabilization (San Clemente and Matilija) to removal of stored sediment (York) to annual dredging to maintain capacity and prevent sediment passing over the dam (proposed for Searsville).

  6. Owyhee River intracanyon lava flows: does the river give a dam?

    USGS Publications Warehouse

    Ely, Lisa L.; Brossy, Cooper C.; House, P. Kyle; Safran, Elizabeth B.; O'Connor, Jim E.; Champion, Duane E.; Fenton, Cassandra R.; Bondre, Ninad R.; Orem, Caitlin A.; Grant, Gordon E.; Henry, Christopher D.; Turrin, Brent D.

    2013-01-01

    Rivers carved into uplifted plateaus are commonly disrupted by discrete events from the surrounding landscape, such as lava flows or large mass movements. These disruptions are independent of slope, basin area, or channel discharge, and can dominate aspects of valley morphology and channel behavior for many kilometers. We document and assess the effects of one type of disruptive event, lava dams, on river valley morphology and incision rates at a variety of time scales, using examples from the Owyhee River in southeastern Oregon. Six sets of basaltic lava flows entered and dammed the river canyon during two periods in the late Cenozoic ca. 2 Ma–780 ka and 250–70 ka. The dams are strongly asymmetric, with steep, blunt escarpments facing up valley and long, low slopes down valley. None of the dams shows evidence of catastrophic failure; all blocked the river and diverted water over or around the dam crest. The net effect of the dams was therefore to inhibit rather than promote incision. Once incision resumed, most of the intracanyon flows were incised relatively rapidly and therefore did not exert a lasting impact on the river valley profile over time scales >106 yr. The net long-term incision rate from the time of the oldest documented lava dam, the Bogus Rim lava dam (?1.7 Ma), to present was 0.18 mm/yr, but incision rates through or around individual lava dams were up to an order of magnitude greater. At least three lava dams (Bogus Rim, Saddle Butte, and West Crater) show evidence that incision initiated only after the impounded lakes filled completely with sediment and there was gravel transport across the dams. The most recent lava dam, formed by the West Crater lava flow around 70 ka, persisted for at least 25 k.y. before incision began, and the dam was largely removed within another 35 k.y. The time scale over which the lava dams inhibit incision is therefore directly affected by both the volume of lava forming the dam and the time required for sediment to fill the blocked valley. Variations in this primary process of incision through the lava dams could be influenced by additional independent factors such as regional uplift, drainage integration, or climate that affect the relative base level, discharge, and sediment yield within the watershed. By redirecting the river, tributaries, and subsequent lava flows to different parts of the canyon, lava dams create a distinct valley morphology of flat, broad basalt shelves capping steep cliffs of Tertiary sediment. This stratigraphy is conducive to landsliding and extends the effects of intracanyon lava flows on channel geomorphology beyond the lifetime of the dams.

  7. 76 FR 12094 - Whitman River Dam, Inc.

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-04

    ...Commission [Project No. 13237-002] Whitman River Dam, Inc. Notice of Application Tendered for Filing...February 14, 2011. d. Applicant: Whitman River Dam, Inc. e. Name of Project: Crocker Dam Hydro Project. f. Location: On the Whitman...

  8. 78 FR 62627 - Sam Rayburn Dam Rate

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-22

    ...Southwestern Power Administration Sam Rayburn Dam Rate AGENCY: Southwestern Power Administration...increases the power rate for the Sam Rayburn Dam (Rayburn) project pursuant to the Rayburn...Hydro Power and Energy Sold to Sam Rayburn Dam Electric Cooperative, Inc....

  9. Peak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA

    USGS Publications Warehouse

    Fenton, C.R.; Webb, R.H.; Cerling, T.E.

    2006-01-01

    The failure of a lava dam 165,000 yr ago produced the largest known flood on the Colorado River in Grand Canyon. The Hyaloclastite Dam was up to 366 m high, and geochemical evidence linked this structure to outburst-flood deposits that occurred for 32 km downstream. Using the Hyaloclastite outburst-flood deposits as paleostage indicators, we used dam-failure and unsteady flow modeling to estimate a peak discharge and flow hydrograph. Failure of the Hyaloclastite Dam released a maximum 11 ?? 109 m3 of water in 31 h. Peak discharges, estimated from uncertainty in channel geometry, dam height, and hydraulic characteristics, ranged from 2.3 to 5.3 ?? 105 m3 s-1 for the Hyaloclastite outburst flood. This discharge is an order of magnitude greater than the largest known discharge on the Colorado River (1.4 ?? 104 m3 s-1) and the largest peak discharge resulting from failure of a constructed dam in the USA (6.5 ?? 104 m3 s-1). Moreover, the Hyaloclastite outburst flood is the oldest documented Quaternary flood and one of the largest to have occurred in the continental USA. The peak discharge for this flood ranks in the top 30 floods (>105 m3 s-1) known worldwide and in the top ten largest floods in North America. ?? 2005 University of Washington. All rights reserved.

  10. Effects of solute breakthrough curve tail truncation on residence time estimates: A synthesis of solute tracer injection studies

    E-print Network

    Covino, Tim

    appropriately characterized by power law tailing. We synthesized results from a variety of tracer residence time. Failure to consider tail truncation leads to underestimation of hyporheic exchange and solute retention and to corresponding overestimation of hyporheic biogeochemical transformation rates

  11. War damages and reconstruction of Peruca dam

    SciTech Connect

    Nonveiller, E. [Univ. of Zagreb (Croatia). Faculty of Civil Engineering] [Univ. of Zagreb (Croatia). Faculty of Civil Engineering; Rupcic, J. [Univ. of Zagreb (Croatia). Faculty of Civil Engineering] [Univ. of Zagreb (Croatia). Faculty of Civil Engineering; [Elektroprojekt Consulting Engineering, Zagreb (Croatia); Sever, Z. [Elektroprojekt Consulting Engineering, Zagreb (Croatia)] [Elektroprojekt Consulting Engineering, Zagreb (Croatia)

    1999-04-01

    The paper describes the heavy damages caused by blasting in the Peruca rockfill dam in Croatia in January 1993. Complete collapse of the dam by overtopping was prevented through quick action of the dam owner by dumping clayey gravel on the lowest sections of the dam crest and opening the bottom outlet of the reservoir, thus efficiently lowering the water level. After the damages were sufficiently established and alternatives for restoration of the dam were evaluated, it was decided to construct a diaphragm wall through the damaged core in the central dam part as the impermeable dam element and to rebuild the central clay core at the dam abutments. Reconstruction works are described.

  12. Inspection of earthen embankment dams using time lapse electrical resistivity tomography

    NASA Astrophysics Data System (ADS)

    Case, Jared S.

    According to the National Inventory of Dams (NID), the number of dams across the United States is approximately 85,000. Many of these dams are more than 50 years old and need vast attention to ensure their safety. It is difficult to obtain a full assessment of the dam just by visual inspections alone. This is because many problems associated with dam failure occur internally, which makes it difficult to be observed by the dam inspectors. Examples of these flaws are piping and seepage (flow of water through or around dam walls). It is in this area where geophysical methods can aid in obtaining a more confident evaluation of a dam's integrity. Electrical resistivity is one geophysical technique that would be useful in detecting internal flaws associated with seepage and piping because it is sensitive to moisture changes. A study is being conducted to examine the feasibility of electrical resistivity tomography (ERT) to map and monitor internal compromised zones within earthen embankment dams. Two quarter-scaled earthen embankment dams were built at the United States Department of Agriculture (USDA) Agriculture Research Service (ARS) Hydraulics and Engineering Research Unit (HERU) in Stillwater, Oklahoma. These two dams were constructed with known internal compromised zones that are susceptible to seepage and piping. Electrical resistivity surveys were conducted on the completed dams using a 56 electrode dipole-dipole array. The collected data was then processed using electrical resistivity tomography (ERT) imaging software and evidence of these two compromised zones was easily visible. Also, additional surveys were conducted in order to monitor the changes in electrical signatures associated with changes in these zones due to filling of the reservoir and environmental/climate changes.

  13. Hoover Dam and Hydroelectric Power

    NSDL National Science Digital Library

    WGBH Educational Foundation

    This video segment is adapted from Building Big, a PBS series hosted by David Macaulay. It explores Hoover Dam's hydroelectric capabilities by explaining how it is able to harness the potential energy stored in the reservoir and convert it to electricity. It also discusses environmental impacts of the dam and others like it.

  14. Why Do We Build Dams?

    NSDL National Science Digital Library

    Integrated Teaching and Learning Program,

    Students are introduced to the concept of a dam and its potential benefits, which include water supply, electricity generation, flood control, recreation and irrigation. This lesson begins an ongoing classroom scenario in which student engineering teams working for the Splash Engineering firm design dams for a fictitious client, Thirsty County.

  15. Seismic remediation for earth dams

    Microsoft Academic Search

    W. F. Marcuson; P. F. Hadala; R. H. Ledbetter

    1993-01-01

    There are hundreds of earth dams in the US, many of them old and some in need of seismic remediation to operate safely. This article is a look at the current state of the practice and at two US Army Corps of Engineers remediation projects now under way. Public safety demands that earth dams retain their reservoirs in an earthquake,

  16. Geotechnical practice in dam rehabilitation

    SciTech Connect

    Anderson, L.R. (ed.)

    1993-01-01

    This proceedings, Geotechnical Practice in Dam Rehabilitation, consists of papers presented at the Specialty Conference sponsored by the Geotechnical Engineering Division of the American Society of Civil Engineers held in Raleigh, North Carolina, April 25-28, 1993. The conference provided a forum for the discussion of the rehabilitation of dams, including case histories and current geotechnical practice. The topics covered by this proceeding include: (1) inspection and monitoring of dams; (2) investigation and evaluation of dams and foundations; (3) risk and reliability assessment; (4) increasing reservoir capacity, spillway modifications and overtopping; (5) seepage control; (6) improving stability of dams, foundations and reservoir slopes; (7) rehabilitation for seismic stability; and (8) geosynthetics and ground improvement techniques.

  17. 6. GENE WASH DAM, LOOKING NORTHWEST. SURVEY REFLECTOR IN FOREGROUND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. GENE WASH DAM, LOOKING NORTHWEST. SURVEY REFLECTOR IN FOREGROUND FOR MONITORING MOVEMENT OF DAM AND EARTH. - Gene Wash Reservoir & Dam, 2 miles west of Parker Dam, Parker Dam, San Bernardino County, CA

  18. A review of catastrophic drainage of moraine-dammed lakes in British Columbia

    Microsoft Academic Search

    John J. Clague; Stephen G. Evans

    2000-01-01

    Moraine-dammed lakes are common in the high mountains of British Columbia. Most of these lakes formed when valley and cirque glaciers retreated from advanced positions achieved during the Little Ice Age. Many moraine dams in British Columbia are susceptible to failure because they are steep-sided, have relatively low width-to-height ratios, comprise loose, poorly sorted sediment, and may contain ice cores

  19. Is it worth a dam?

    PubMed Central

    Joyce, S

    1997-01-01

    Once a sign of modernization and growth, dams are often seen today as symbols of environmental and social devastation. Over 800,000 dams have been built worldwide to provide drinking water, flood control, hydropower, irrigation, navigation, and water storage. Dams do indeed provide these things,but at the cost of several adverse, unexpected effects: disruption of ecosystems, decline of fish stocks, forced human and animal resettlements, and diseases such as malaria, which are borne by vectors that thrive in quiet waters. PMID:9349830

  20. Deer Creek Dam, Dam, 1,204 feet/238 degrees from intersection of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Deer Creek Dam, Dam, 1,204 feet/238 degrees from intersection of dam complex access road and U.S. Highway 189 to center of dam, 874 feet/352 degrees from Hydroelectric Powerplant (HAER UT-93-B) to center of dam, Charleston, Wasatch County, UT

  1. MASTER PLAN ChiefJosephDamHatcheryProgram This Chief Joseph Dam Hatchery Program Master Plan

    E-print Network

    #12;i MASTER PLAN ChiefJosephDamHatcheryProgram This Chief Joseph Dam Hatchery Program Master Plan Fisheries Enhancement Group ChiefJosephDam HatcheryProgram M A S T E R P L A N #12;ChiefJosephDam Joseph Dam. The Okanogan River is the uppermost tributary of the Columbia that is still available

  2. EFFECT OF ENCROACHMENT OF WANAPUM DAM RESERVOIR ON FISH PASSAGE OVER ROCK ISLAND DAM, COLUMBIA RIVER

    E-print Network

    EFFECT OF ENCROACHMENT OF WANAPUM DAM RESERVOIR ON FISH PASSAGE OVER ROCK ISLAND DAM, COLUMBIA the lower sections of the three fish ladders at Rock Island Dam, 61 km upstream from Wanapum Dam of the center and left-bank fish ladders of Rock Island Dam were rebuilt and a new sequence of spill patterns

  3. CLEARWATER SUBBASIN, ID -- DAM LOCATIONS

    EPA Science Inventory

    This map includes locations of dams in the Clearwater subbasin, Idaho. Source: US Army Corps of Engineers, BPA, and State Water Resource Departments from the Eastside Ecosystems Management Project. ...

  4. Hoover Dam Intake Towers Panorama

    USGS Multimedia Gallery

    Hoover Dam impounds Lake Mead and provides drinking water and hydroelectric power to the surrounding area. It was constructed between 1931 and 1936. The Intake Towers are where water enters to generate electricity....

  5. ALAMO DAM DEMONSTRATION RISK ASSESSMENT

    Microsoft Academic Search

    David S. Bowles; Loren R. Anderson; Joseph B. Evelyn; Terry F. Glover; David M. Van Dorpe

    1999-01-01

    A demonstration risk assessment was conducted on the 283-foot high rolled-earthfill Alamo Dam as part of a U.S. Army Corps of Engineers (USACE) Research and Development program. The existing dam and 19 structural risk reduction alternatives were evaluated for flood, earthquake and normal operating conditions. The paper summarizes the risk assessment process, results, findings and recommendations. It also provides an

  6. 78 FR 53494 - Dam Safety Modifications at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-29

    ...TENNESSEE VALLEY AUTHORITY Dam Safety Modifications at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams AGENCY: Tennessee Valley Authority...environmental impact statement (EIS) for the dam safety modifications at Cherokee,...

  7. Control and Limitations of Navigating a Tail Rotor\\/Actuator Failed Unmanned Helicopter

    Microsoft Academic Search

    Richard D. Garcia; Ainsmar Brown

    2011-01-01

    According to Federal Aviation Administration (FAA) statistics on mechanical failures, tail rotor failure is the third highest\\u000a cause of fatal accidents in helicopters. Tail rotor failure represents a serious hazard to personnel and mission objectives\\u000a and can create high fiscal loss. This is especially true for unmanned helicopters, which cannot be equipped with the fail-safes\\u000a standard on manned counterparts. This

  8. A pre-dam-removal assessment of sediment transport for four dams on the Kalamazoo River between Plainwell and Allegan, Michigan

    USGS Publications Warehouse

    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 sediment deposition occurs during low to average flows (monthly mean flows between 25.49 m3/s and 50.97 m3/s) after a high-flow event. If the flow continues to stay in the low to average range the system shifts towards equilibrium, resulting in a balancing effect between sediment deposition and erosion rates. The 1947 flood-flow simulations show approximately 30,000 m3 more instream sediments erosion for the first 21 days of the dams removed scenario than for the existing-dams scenario, with the same initial conditions for both scenarios. Application of a locally weighted regression smoothing (LOWESS) function to simulation results of the dams removed scenario indicates a steep downtrend with high sediment transport rates during the first 21 days. In comparison, the LOWESS curve for the existing-dams scenario shows a smooth transition of sediment transport rates in response to the change in streamflow. The high erosion rates during the dams-removed scenario are due to the absence of the dams; in contrast, the presence of dams in the existing-dams scenario helps reduce sediment erosion to some extent. The overall results of 60-day simulations for the 1947 flood show no significant difference in total volume of eroded sediment between the two scenarios, because the dams in the study reach have low heads and no control gates. It is important to note that the existing-dams and dams-removed scenarios simulations are run for only 60 days; therefore, the simulations take into account the changes in sediment erosion and deposition rates only during that time period. Over an extended period, more erosion of instream sediments would be expected to occur if the dams are not properly removed than under the existing conditions. On the basis of model simulations, removal of dams would further lower the head in all the channels. This lowering of head could produce higher flow velocities in the study reach, which ultimately would result in accelerated erosion rates.

  9. Constraining the timing of the most recent cataclysmic flood event from ice-dammed lakes in the Russian Altai Mountains, Siberia, using cosmogenic in situ 10Be

    Microsoft Academic Search

    Anne U. Reuther; Jürgen Herget; Susan Ivy-Ochs; Pavel Borodavko; Peter W. Kubik; Klaus Heine

    2006-01-01

    Ice-dammed lakes were repeatedly formed in intermontane basins in the Russian Altai Mountains throughout the Pleistocene. These cataclysmic outburst floods, caused by ice-dam failures, were documented as Earth's largest flood waves by other geoscientists. Using in situ 10Be, we successfully dated surfaces of flood-associated boulders located in a former lake basin and downvalley from a former ice dam. Our precise

  10. Effects of different soil ameliorants on Karee trees (Searsia lancea) growing on mine tailings dump soil—Part I: Pot trials

    Microsoft Academic Search

    CHRISTIAN A. LANGE; KARSTEN KOTTE; MARTIN SMIT; P. W. VAN DEVENTER; LEON VAN RENSBURG

    2012-01-01

    Rehabilitation of mine tailings dams is often a challenge due to a lack of nutrients and a poor humus reservoir prevailing in tailings soils. This is especially true for establishing longer lived species such as trees. For these reasons the effects of different soil ameliorants (woodchips compost, vermicompost, mature sewage sludge), added to the root system of Karee (Searcia lancea)

  11. Assessing low-activity faults for the seismic safety of dams

    SciTech Connect

    Page, W.D.; Savage, W.U.; McLaren, M.K. [Pacific Gas and Electric Co., San Francisco, CA (United States)

    1995-12-31

    Dams have been a familiar construct in the northern Sierra Nevada range in California (north of the San Joaquin River) since the forty-niners and farmers diverted water to their gold mines and farms in the mid 19th century. Today, more than 370 dams dot the region from the Central Valley to the eastern escarpment. Fifty-five more dam streams on the eastern slope. The dams are of all types: 240 earth fill; 56 concrete gravity; 45 rock and earth fills; 35 rock fill; 14 concrete arch; 9 hydraulic fill; and 29 various other types. We use the northern Sierra Nevada to illustrate the assessment of low-activity faults for the seismic safety of dams. The approach, techniques, and methods of evaluation are applicable to other regions characterized by low seismicity and low-activity faults having long recurrence intervals. Even though several moderate earthquakes had shaken the Sierra Nevada since 1849 (for example, the 1875 magnitude 5.8 Honey Lake and the 1909 magnitudes 5 and 5.5 Downieville earthquakes), seismic analyses for dams in the area generally were not performed prior to the middle of this century. Following the 1971 magnitude 6.7 San Fernando earthquake, when the hydraulic-fill Lower Van Norman Dam in southern California narrowly escaped catastrophic failure, the California Division of Safety of Dams and the Federal Energy Regulatory Commission required seismic safety to be addressed with increasing rigor. In 1975, the magnitude 5.7 Oroville earthquake on the Cleveland Hill fault near Oroville Dam in the Sierra Nevada foothills, showed convincingly that earthquakes and surface faulting could occur within the range. Following this event, faults along the ancient Foothills fault system have been extensively investigated at dam sites.

  12. Kinesin: the tail unfolds

    Microsoft Academic Search

    Robert Cross; Jonathan Scholey

    1999-01-01

    The cargo-binding tail of the motor protein kinesin acts as a regulator of kinesin-driven vesicle transport. In the absence of bound cargo, the kinesin tail interacts with the motor domains and inhibits their activity. Cargo binding blocks this interaction and relieves the inhibition.

  13. Heart Failure

    MedlinePLUS

    ... version of this page please turn Javascript on. Heart Failure What is Heart Failure? In heart failure, the heart cannot pump ... the lungs, where it picks up oxygen. The Heart's Pumping Action In normal hearts, blood vessels called ...

  14. 17. VIEW OF MAIN AND DIVERSION DAMS FROM WATERGATE AFTER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. VIEW OF MAIN AND DIVERSION DAMS FROM WATER-GATE AFTER REMOVAL OF DRIFTWOOD. DIVERSION DAM IN LEFT FOREGROUND, MAIN DAM TO THE RIGHT. Photographed July 18, 1938. - Forge Creek Dam-John Cable Mill, Townsend, Blount County, TN

  15. OVERALL VIEW OF CASCADE CANAL COMPANY CRIB DAM, LOOKING UPSTREAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    OVERALL VIEW OF CASCADE CANAL COMPANY CRIB DAM, LOOKING UPSTREAM FROM DIRECTION OF KACHESS DAM. VIEW TO NORTH - Kachess Dam, 1904 Cascade Canal Company Crib Dam, Kachess River, 1.5 miles north of Interstate 90, Easton, Kittitas County, WA

  16. American Experience: Grand Coulee Dam

    NSDL National Science Digital Library

    2012-04-27

    Among many great national achievements during the Great Depression, the Grand Coulee Dam remains one of the most impressive. This fine website from the American Experience program complements a documentary that was first aired on PBS in 2012. The construction of this dam would, in the worlds of President Franklin Roosevelt, be part of a "planned promised land" that would transform the lives of farm families. The site includes a great interactive timeline, a photo gallery, and a short preview of the entire film. Additionally, the site includes two nice bonus videos, including one that deals with the processes of closing the spillway. The blog on the site includes several interesting posts on the history of the dam. Also, visitors have the opportunity to share their own stories about their own favorite iconic structures in the United States.

  17. The Dramatic Methods of Hans van Dam.

    ERIC Educational Resources Information Center

    van de Water, Manon

    1994-01-01

    Interprets for the American reader the untranslated dramatic methods of Hans van Dam, a leading drama theorist in the Netherlands. Discusses the functions of drama as a method, closed dramatic methods, open dramatic methods, and applying van Dam's methods. (SR)

  18. 7 CFR 1724.55 - Dam safety.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...available from FEMA: (i)“Emergency Action Planning Guidelines for Dams,”FEMA 64. (ii)“Federal Guidelines for Earthquake Analysis and Design of Dams,”FEMA 65. (iii)“Federal Guidelines for Selecting and Accommodating Inflow Design...

  19. 7 CFR 1724.55 - Dam safety.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...available from FEMA: (i)“Emergency Action Planning Guidelines for Dams,”FEMA 64. (ii)“Federal Guidelines for Earthquake Analysis and Design of Dams,”FEMA 65. (iii)“Federal Guidelines for Selecting and Accommodating Inflow Design...

  20. 33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. 208...FLOOD CONTROL REGULATIONS § 208.19 Marshall Ford Dam and Reservoir (Mansfield Dam and Lake...

  1. 33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Texas.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Texas. 208...FLOOD CONTROL REGULATIONS § 208.19 Marshall Ford Dam and Reservoir (Mansfield Dam and Lake...

  2. 33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. 208...FLOOD CONTROL REGULATIONS § 208.19 Marshall Ford Dam and Reservoir (Mansfield Dam and Lake...

  3. 78 FR 77397 - Flood Control Regulations, Marshall Ford Dam (Mansfield Dam and Lake Travis), Colorado River, Texas

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-23

    ...CFR Part 208 Flood Control Regulations, Marshall Ford Dam (Mansfield Dam and Lake Travis), Colorado River, Texas AGENCY: U...rules regarding use and administration of Marshall Ford Dam (Mansfield Dam and Lake Travis), Colorado...

  4. 33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. 208...FLOOD CONTROL REGULATIONS § 208.19 Marshall Ford Dam and Reservoir (Mansfield Dam and Lake...

  5. 33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. 208...FLOOD CONTROL REGULATIONS § 208.19 Marshall Ford Dam and Reservoir (Mansfield Dam and Lake...

  6. GATC Flanking Sequences Regulate Dam Activity: Evidence for how Dam Specificity may Influence

    E-print Network

    Reich, Norbert O.

    GATC Flanking Sequences Regulate Dam Activity: Evidence for how Dam Specificity may Influence pap coli DNA adenine methyltransferase (Dam) plays essential roles in DNA replication, mismatch repair and gene regulation. The differential methylation by Dam of the two GATC sequences in the pap promoter

  7. Effects of dam’s dry period length on heifer development

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Effect of the dam’s dry period length on calving ease (CE), stillbirth (SB), and heifer development was investigated using US Holstein field data from January 1997. Dry periods were grouped into 12 days dry (DD) categories. Calving ease scores and SB rates were compared across dam’s DD categories, a...

  8. The Best Dam Simulation Ever

    NSDL National Science Digital Library

    OMSI

    2006-01-01

    This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest. Learners play the role of dam operator, controlling how much water passes through the dam each season. First, learners choose whether it's a very dry or wet (or average) year and adjust the level of the reservoir in fall, winter, spring and summer. Learners see how their choices affect the migrating river salmon, power bills, recreation, agriculture, flooding, and fish that live in the reservoir. The results are compared to those of the real operators, and learners can print out a copy of your final report.

  9. Should We Dam Nanticoke Creek?

    NSDL National Science Digital Library

    Philip Childs

    In this decision-making exercise, students investigate what would occur if a dam were built along Nanticoke Creek, a real stream just north of West Corners near the Village of Endicott, New York. They will use topographic maps to determine how much area would be flooded by the new reservoir, to study river drainages, and to consider the impacts of dams on a region. They must also consider rivers in the context of their relation to humankind. The exercise can be extended to other, more local locations having similar topography.

  10. National dam inventory provides data for analysis

    Microsoft Academic Search

    Spragens

    1992-01-01

    The Association of State Dam Safety Officials completed a dam inventory this fall. Information on approximately 90,000 state-regulated dams in the US collected during the four-year inventory is being used to build a database managed by the Federal Emergency Management Agency. In addition to ASDSO's work, the federal government conducted an inventory of federal dams. This data will be added

  11. Webinar: Stepped chute design for embankment dams

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Changing demographics in the vicinity of dams have led to hazard creep in a number of dams worldwide. Many of these dams now have insufficient spillway capacity as a result of these changes in hazard classification from low to significant or high hazard. Stepped chutes applied to the embankment da...

  12. Viscoplastic dam breaks and the Bostwick consistometer

    E-print Network

    Balmforth, Neil

    Viscoplastic dam breaks and the Bostwick consistometer N. J. Balmforth, a R. V. Craster, b P'Informazione, Universit`a di Milano, Crema, Italy Abstract We present a theoretical and experimental analysis of the dam the broken dam) that may assist an experimentalist to unravel those dependences. Experiments are conducted

  13. 7 CFR 1724.55 - Dam safety.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 2012-01-01 false Dam safety. 1724.55 Section 1724.55... Electric System Design § 1724.55 Dam safety. (a) The provisions of this...borrower that owns or operates a RUS financed dam must utilize the“Federal Guidelines...

  14. On Quantum Computation Theory Wim van Dam

    E-print Network

    ten Cate, Balder

    On Quantum Computation Theory Wim van Dam #12;#12;On Quantum Computation Theory #12;ILLC woensdag 9 oktober 2002, te 14.00 uur door Willem Klaas van Dam geboren te Breda. #12;Promotor: Prof. dr. P Dam, 2002 ISBN: 90­5776­091­6 #12;" . . . Many errors have been made in the world which today

  15. ANNUAL FISH PASSAGE REPORT ROCK ISLAND DAM

    E-print Network

    ANNUAL FISH PASSAGE REPORT ROCK ISLAND DAM COLUMBIA RIVER, WASHINGTON, 1959 :y .iiJA/i-3ri ^' WUUUi. ANNUAL FISH PASSAGE REPORT - ROCK ISLAND DAM COLUMBIA RIVER, WASHINGTON, 1959 by Paul D. Zimmer, Clifton and observations 10 Summary 13 #12;#12;ANNUAL FISH PASSAGE REPORT - ROCK ISLAND DAM COLUMBIA RIVER, WASHINGTON

  16. ANNUAL FISH PASSAGE REPORT ROCK ISLAND DAM

    E-print Network

    42) ANNUAL FISH PASSAGE REPORT ROCK ISLAND DAM COLUMBIA RIVER, WASHINGTON 1961 Marine Biological. McKeman, Director ANNUAL FISH PASSAGE REPORT - ROCK ISLAND DAM COLUMBIA RIVER, WASHINGTON, 1961--Fisheries No. 421 Washington, D. C. April 1962 #12;Rock Island Dam, Columbia River, Washington ii #12;CONTENTS

  17. DAMS: Distributed Adaptive Metaheuristic Selection Bilel Derbel

    E-print Network

    Paris-Sud XI, Université de

    DAMS: Distributed Adaptive Metaheuristic Selection Bilel Derbel Université Lille 1 LIFL ­ CNRS.unice.fr ABSTRACT We present a distributed algorithm, Select Best and Mutate (SBM), in the Distributed Adaptive Metaheuristic Selection (DAMS) frame- work. DAMS is dedicated to adaptive optimization in distributed

  18. Inception point for embankment dam stepped spillways

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Stepped spillways applied to embankment dams have become a common design practice with the rehabilitation of aging watershed dams, especially those experiencing a hazard classification change from low to high hazard. Previous research on stepped spillways focused on gravity dams where aerated flow ...

  19. Ethanol Consumption by Rat Dams During Gestation,

    E-print Network

    Galef Jr., Bennett G.

    Ethanol Consumption by Rat Dams During Gestation, Lactation and Weaning Increases Ethanol examined effects of ethanol consumption in rat dams during gestation, lactation, and weaning on voluntary ethanol consumption by their adolescent young. We found that exposure to an ethanol-ingesting dam

  20. Estimating flooding potential associated with dam breach using GIS-based modeling

    Microsoft Academic Search

    B. J. Gunter; J. S. Kuszmaul; R. M. Holt

    2008-01-01

    One of the damaging events attributable to engineering structures is inundation flooding due to dam breach. A variety of programs exist for determining the extent and magnitude of flooding downstream, which are in widespread use to determine the lives and property at risk to such a failure. The U.S. Army Corps of Engineers' Hydraulic Engineering Center's River Analysis System (HEC-RAS)

  1. Subdaily Hydrologic Variability by Dams

    NASA Astrophysics Data System (ADS)

    Costigan, K. H.; Ruffing, C.; Smith, J. M.; Daniels, M. D.

    2012-12-01

    The effects dams have on hydrologic, geomorphic, and ecologic regimes has been well characterized using mean daily discharge. Subdaily discharge variation (herein flashiness) has not been well characterized for a variety of dam, watershed, and land cover characteristics. The hourly hydrologic records for 30 sites across the continental United States were analyzed for flashiness using the Richards-Baker Index, coefficient of daily variation, percent of total flow variation, and the percent of the year when daily discharge is greater than mean daily discharge. The goal of this analysis is to evaluate the role of catchment variables such as mean slope and land use conditions across receiving watersheds in predicting flashiness; compare flashiness metrics across sites to identify relationships between dam related variables such as type and size; and determine the most appropriate temporal extent for assessing flashiness in streamflow. Our approach relies on data at the watershed scale with a fine temporal grain to determine flashiness over a decade of operation for each dam.

  2. Water and Dams in Today's World

    NSDL National Science Digital Library

    2014-09-18

    Students learn about the importance of dams by watching a video that presents historical and current information on dams, as well as descriptions of global water resources and the hydrologic cycle. Students also learn about different types of dams, all designed to resist the forces on dams. (If the free, 15-minute "Water and Dams in Today's World" video cannot be obtained in time, the lesson can still be taught. See the Additional Multimedia Support section for how to obtain the DVD or VHS videotape, or a PowerPoint presentation with similar content [also attached].)

  3. Remotely installed steam generator nozzle dam system

    SciTech Connect

    Mc Donald, F.X.; Weisel, E.M.; Schukei, G.E.

    1990-09-04

    This patent describes a method for remotely installing a dam unit in a nozzle or a nuclear steam generator head, the head including a manway. It comprises: mounting an articulated manipulator to an internal surface of the head, the manipulator having a free end which carries a jaw member; positioning the manipulator so that the jaw member is adjacent the manway and substantially on the manway axis; passing a first dam segment through the manway and attaching the jaw member to the first segment; positioning the manipulator so that the jaw member holds the first dam segment on one side of the manway axis; passing a second dam segment through the manway into engagement with the first dam segment to form a dam subassembly; translating the manipulator through the head until the dam subassembly is adjacent the nozzle; advancing the jaw member toward the nozzle until the cam subassembly is positioned substantially at the desired location of the dam unit with respect to the nozzle; and deploying the manipulator to install dam support structure between the dam subassembly and the steam generator, thereby forming an installed dam unit.

  4. Modelling the impact of dam removal on geomorphic channel response and sediment delivery: an Austrian case study

    NASA Astrophysics Data System (ADS)

    Pöppl, Ronald; Coulthard, Tom; Keesstra, Saskia; Keiler, Margreth

    2015-04-01

    Dams are often considered to have the most significant impact on rivers as dam construction generally reduces downstream sediment fluxes which further involves geomorphic changes in the affected river reaches. Since many dams no longer fulfill their intended purpose (e.g. due to siltation), are dangerous (e.g. catastrophic dam failures) and/or are ecologically damaging (e.g. habitat destruction), within the last two decades several dams have been removed and many more are already proposed for removal. Unfortunately, there is still only little empirical knowledge about the geomorphic consequences of dam removals and the related sediment release which represents a big challenge for river management. Modelling is one way to approach this problem. In the presented study we modelled the impacts of dam removal on geomorphic channel processes, channel morphology and sediment delivery further considering the role of channel engineering measures and reservoir excavation within a river reach impacted by a series of dams using the landscape evolution model CAESAR-Lisflood. The model was run with data from a small catchment located in Lower Austria. Modelled geomorphic channel changes and sediment fluxes were spatio-temporally analyzed, related to real-world data and are discussed in the context of river management issues.

  5. Curly tail: a 50-year history of the mouse spina bifida model

    Microsoft Academic Search

    H. W. M. van Straaten; Andrew J. Copp

    2001-01-01

    This paper reviews 50 years of progress towards understanding the aetiology and pathogenesis of neural tube defects (NTD) in the curly tail (ct) mutant mouse. More than 45 papers have been published on various aspects of curly tail with the result that it is now the best understood mouse model of NTD pathogenesis. The failure of closure of the spinal

  6. Respiratory Failure

    MedlinePLUS

    Respiratory failure happens when not enough oxygen passes from your lungs into your blood. Your body's organs, such ... brain, need oxygen-rich blood to work well. Respiratory failure also can happen if your lungs can't ...

  7. A tool to aid emergency managers and communities in appraising private dam safety and policy.

    PubMed

    Pisaniello, John D; McKay, Jennifer

    2007-06-01

    Issues concerning dam safety and equitable sharing of catchment run-off are receiving more attention throughout the world. This paper assesses these matters in the context of Australia, and the need for policy responses. Landholders often overlook the common law obligation to review/design dams to current standards because of high costs, leaving them vulnerable to litigation if their dam fails. The paper reports on an innovative spillway design/review procedure, applicable to southeast Australia, but transferable to any region worldwide. Dam safety policy models and guidelines derived from international best practice are linked to the procedure and intended to aid government decision-making. The procedure minimises costs to landholders and provides an acceptable level of safety assurance to downstream communities. Also discussed are recent surveys testing community attitudes to the procedure and implemented dam safety and water allocation policies. These further guide any government wanting to implement this'integrated engineering and community partnerships'approach to preventing potential disasters due to private dam failure and achieving sustainable and safe water storage and use. PMID:17461922

  8. Heart Failure

    MedlinePLUS

    Heart failure is a condition in which the heart can't pump enough blood to meet the body's needs. Heart failure does not mean that your heart has stopped ... Tiredness and shortness of breath Common causes of heart failure are coronary artery disease, high blood pressure and ...

  9. Ranking procedure on maintenance tasks for monitoring of embankment dams

    SciTech Connect

    Andersen, G.R. [Michigan State Univ., East Lansing, MI (United States). Civil Engineering] [Michigan State Univ., East Lansing, MI (United States). Civil Engineering; Chouinard, L.E. [McGill Univ., Montreal, Quebec (Canada)] [McGill Univ., Montreal, Quebec (Canada); Bouvier, C.; Back, W.E. [Texas A and M Univ., College Station, TX (United States)] [Texas A and M Univ., College Station, TX (United States)

    1999-04-01

    A multistep strategy for the prioritization of maintenance and repair funds for the monitoring of embankment dams is proposed wherein the most important device in the worst condition is preferred. The strategy involves determining the importance of each device (in terms of dam safety) and measuring its condition through field inspections. A condition definition for each device is developed in terms of its ability to function optimally in its diagnostic role. Relative importance of the monitoring devices is defined in terms of diagnostic value and proceeds by considering: (1) the failure modes and their conditional probabilities; (2) adverse conditions and their conditional probabilities; (3) indicators that provide information on these adverse conditions and their relative diagnostic value; and (4) monitoring devices that are used to assess the presence of the indicators and their relative diagnostic value. A panel of dam safety experts is used to answer the questions necessary to implement this methodology through a process of expert elicitation. An interactive DOS-based C++ computer program has been developed to assist in the expert elicitation necessary to implement this methodology.

  10. Maple River Dam Spillway Comparison

    USGS Multimedia Gallery

    Maple River Dam spillway comparison in 2011. The top photo was taken on July 14, 2011, with a gage height of 1,027.30 feet and a streamflow of 809 cubic feet per second. The bottom photo was taken on April 13, 2011, with a gage height of 1,052.95 feet and a streamflow of 4,960 cubic feet per second....

  11. Happy Tailings to You

    NSDL National Science Digital Library

    In this activity, students prepare a sample of "mine tailings", then separate out desirable materials using whatever method they choose, and quantify the results. They will discover that sometimes it's hard to separate desirable minerals from undesirable ones, especially if they look alike or the crystals are of similar sizes. Students learn that old, worked-out mines contain some desirable minerals (in small quantities) mixed in with unwanted minerals, but that doesn't stop some people from trying to squeeze out the last drop. Once considered tailings (or trash), the mix may now be profitable for mining. Desirable minerals can be separated physically and chemically.

  12. View of upstream face of the forebay dam of Grand ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of upstream face of the forebay dam of Grand Coulee Dam, looking west. Construction of the forebay dam, which replaced the eastern end of the original Grand Coulee Dam, was completed in 1974. - Columbia Basin Project, Grand Coulee Dam & Franklin D. Roosevelt Lake, Across Columbia River, Southeast of Town of Grand Coulee, Grand Coulee, Grant County, WA

  13. 18. DETAIL AT JUNCTION OF MAIN DAM AT LEFT AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. DETAIL AT JUNCTION OF MAIN DAM AT LEFT AND DIVERSION DAM AT RIGHT SHOWING LOG CRIBBING. SPACES INSIDE CRIBBING WERE FILLED WITH STONE TO ANCHOR DAM; DETERIORATION OF DAM HAS ALLOWED STONE BALLAST TO WASH AWAY. Photographed July 18, 1938. - Forge Creek Dam-John Cable Mill, Townsend, Blount County, TN

  14. DRAFT ENVIRONMENTAL ASSESSMENT1 PINE CREEK DAM, OKLAHOMA2

    E-print Network

    US Army Corps of Engineers

    #12;#12;DRAFT ENVIRONMENTAL ASSESSMENT1 PINE CREEK DAM, OKLAHOMA2 DAM SAFETY MODIFICATION3 &4 Environmental Assessment Pine Creek Dam, Oklahoma Dam Safety Modification & Interim Risk Reduction Measure and risk reduction measures necessary to correct structural and maintenance deficiencies of Pine Creek Dam

  15. REAR PROFILE OF TAIL FROM SECOND LEVEL OF TAIL DOCK ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    REAR PROFILE OF TAIL FROM SECOND LEVEL OF TAIL DOCK STAND, SHOWING AIRCRAFT NUMBER (319), HORIZONTAL STABILIZER, TAIL CONE AND COOLING CTS FOR THE AUXILIARY POWER UNIT (APU), MECHANIC PAUL RIDEOUT IS LOWERING THE BALANCE PANELS ON THE STABILIZERS FOR LUBRICATION AND INSPECTION. - Greater Buffalo International Airport, Maintenance Hangar, Buffalo, Erie County, NY

  16. Dolphin Skeleton - Tail

    NSDL National Science Digital Library

    Ketan Patel (California State University, Fullerton; Student, Biological Sciences)

    2007-07-14

    The dolphin is built to be sleek. Its body is made of almost entirely backbone (a gliding joint) which makes it very flexible under water. The ribs protect the inner organs of the dolphin and the tail beats from side to side, thrusting the animal forward.

  17. A study on dam instrumentation retrofitting

    Microsoft Academic Search

    A. Melih Yanmaz; Onur Ari

    2011-01-01

    Continuous monitoring and inspection of large dams would provide means for proper rehabilitative actions to be taken on time\\u000a which intend to maintain the desired safety throughout the physical life of dams. Comprehensive inspections can be carried\\u000a out using a number of instruments. An ideal dam instrumentation system should provide time-dependent information about critical\\u000a parameters so that possible future behaviour

  18. Geomorphic Responses to Check-Dam Removal on a Steep Mountain River in Taiwan

    NASA Astrophysics Data System (ADS)

    Wang, H. W.; Kuo, W. C.

    2014-12-01

    The Chijiawan creek, located in the mountains of Central Taiwan with a strongly seasonal hydrology, high discharge and sediment yields, is the only habitat in Taiwan of the endangered Formosan landlocked salmon. The 13-m-high No. 1 Check Dam was the largest and lowermost barrier on Chijiawan creek built in 1972. After forty years, the dam had 4-m scouring holes below its foundation, raising a significant risk of dam failure. Due to the safety concern and habitat restoration, the Shei-Pa National Park removed the dam in late May 2011. This paper documents the channel evolution after its removal by focusing on understanding the geomorphic responses to sediment processes and complexities of hydrological processes. We collected the hourly discharge data of a Taipower gaging station located 6.8 km from the dam from 2010 to 2013 and conducted surveys of grain size distributions, cross-sectional and longitudinal profiles, and carried out repeat photography. One month after dam removal, a one-year event (Typhoon Meari) excavated a wedge of sediment from the impoundment. The knickpoint migrated to 200 m upstream from the dam and about 20,000 m3 of sediment had eroded from the reservoir. The profile remained pretty much unchanged until a year after in June 2012. Following a 20-year event (Typhoon Saola) in August 2012, the highest flow after dam removal to present, the channel significantly changed and the knickpoint migrated to 800 m upstream to the dam. The cumulative eroded amount increased to 150,000 m3, about three-thirds of the former impounded sediment. After a 5-year event (Typhoon Soulik) later on in July 2013, the knickpoint did not show much difference and the eroded amount of impounded sediment only increased 10,000 m3. However, the surveyed cross-sections showed obvious channel form changes and thalweg migration. It is likely that the entire bed was mobilized during the earlier high flows (Typhoon Saola), resulting in more easily mobilized bed material. As many dams in Taiwan are located in steep mountainous area with highly variable hydrologic condition, we anticipate the observations will help enhancing future similar dam removal projects.

  19. Green River Locks and Dams 3, 4, 5, 6 and Barren River Lock and Dam 1 Disposition, Kentucky

    E-print Network

    US Army Corps of Engineers

    Green River Locks and Dams 3, 4, 5, 6 and Barren River Lock and Dam 1 Disposition, Kentucky 16 September 2014 ABSTRACT: Green River Locks and Dams 3 through 6 and Barren River Lock and Dam 1 were. The Green River Locks and Dams 5 and 6 ceased operations in 1951 due to a marked decline in navigation

  20. World Wide Web Pages for Dam Design

    NSDL National Science Digital Library

    This site is a very informative and well presented resource for dam design, primarily intended to give undergraduates or anyone interested in the subject a solid introduction to the basic concepts. Maintained at the University of Durham in Britain, there are many sections that provide a good overview of the many processes involved in building a dam. Many different types of dams are described in detail, including concrete and embankment dams. Hydrology and geology, important factors that need to be considered when choosing a suitable location, are also covered. The layout of the site is fairly good overall, but navigating the many sections and subsections can sometimes get confusing.

  1. Hoover Dam: The American Experience Online

    NSDL National Science Digital Library

    The American Experience Online presents this companion site to its recent American Experience film about the one of the greatest hydroengineering feats in history. The Hoover Dam, in Black Canyon on the Colorado River, at the Arizona-Nevada border, was built between 1930 and 1936 and is the highest concrete arch dam in the US. The site provides a program description, an enhanced transcript of the film, a brief bibliography, a list of the dam facts, an essay that explores the economic and environmental effects of the dam, a timeline, a map, a People and Events Database, and a teacher's guide.

  2. Evaluating Dam Safety Retrofits With Uncertain Benefits: The Case of Mohawk Dam (Walhonding River, Ohio)

    Microsoft Academic Search

    Daniel Resendiz-Carrillo; Lester B. Lave

    1990-01-01

    Mohawk Dam, part of the Muskingum basin flood control system, was built in 1938 and is operated by the U.S. Army Corps of Engineers (Corps). Since this high-hazard dam could not survive a probable maximum flood (PMF), the Corps conducted a study to determine the least expensive means of enabling the dam to survive a PMF. Applying a previously proposed

  3. Evaluating dam safety retrofits with uncertain benefits: The Case of Mohawk Dam (Walhonding River, Ohio)

    Microsoft Academic Search

    Daniel Resendiz-Carrillo; Lester B. Lave

    1990-01-01

    Mohawk Dam, part of the Muskingum basin flood control system, was built in 1938 and is operated by the U.S. Army Corps of Engineers (Corps). Since this high-hazard dam could not survive a probable maximum flood (PMF), the Corps conducted a study to determine the least expensive means of enabling the dam to survive a PMF. Applying a previously proposed

  4. Dam located to east of powerhouse, view from south. This ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Dam located to east of powerhouse, view from south. This dam holds back the waters of the Chattahoochee River to form the mill pond north of Riverdale Cotton Mill - Riverdale Cotton Mill, Powerhouse & Dam, Valley, Chambers County, AL

  5. 2. East side of lower dam shown with water flowing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. East side of lower dam shown with water flowing over dam. VIEW WEST - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

  6. 3. VIEW SHOWING CREST OF DAM, LOOKING NORTHWEST High ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW SHOWING CREST OF DAM, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, Milk Lake Dam, Ashley National Forest, 9.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  7. 6. VIEW SHOWING DOWNSTREAM FACE OF DAM, SHOWING SEEPAGE CONTROL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW SHOWING DOWNSTREAM FACE OF DAM, SHOWING SEEPAGE CONTROL REINFORCEMENT, LOOKING SOUTHWEST - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  8. 3. VIEW SHOWING UPSTREAM FACE OF DAM, WITH OUTLET GATE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW SHOWING UPSTREAM FACE OF DAM, WITH OUTLET GATE IN BACKGROUND, LOOKING NORTH - High Mountain Dams in Upalco Unit, Drift Lake Dam, Ashley National Forest, 11.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  9. 5. VIEW SHOWING DOWNSTREAM FACE OF DAM, WITH OUTLET CHANNEL, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. VIEW SHOWING DOWNSTREAM FACE OF DAM, WITH OUTLET CHANNEL, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  10. 4. VIEW SHOWING DOWNSTREAM FACE OF DAM, LOOKING NORTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW SHOWING DOWNSTREAM FACE OF DAM, LOOKING NORTH - High Mountain Dams in Upalco Unit, Milk Lake Dam, Ashley National Forest, 9.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  11. 3. VIEW OF UPSTREAM FACE OF DAM, SHOWING OUTLET GATE, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW OF UPSTREAM FACE OF DAM, SHOWING OUTLET GATE, LOOKING NORTHEAST - High Mountain Dams in Upalco Unit, Island Lake Dam, Ashley National Forest, 4.8 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

  12. 3. VIEW OF CONCRETE DAM EXTENSION AND SPILLWAY, LOOKING WEST ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW OF CONCRETE DAM EXTENSION AND SPILLWAY, LOOKING WEST - High Mountain Dams in Upalco Unit, Five Point Lake Dam, Ashley National Forest, 12 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  13. 4. VIEW OF DOWNSTREAM FACE AND TOE OF DAM, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW OF DOWNSTREAM FACE AND TOE OF DAM, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, Island Lake Dam, Ashley National Forest, 4.8 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

  14. 6. VIEW OF DOWNSTREAM FACE AND DAM AND OUTLET CHANNEL, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW OF DOWNSTREAM FACE AND DAM AND OUTLET CHANNEL, LOOKING EAST - High Mountain Dams in Upalco Unit, Brown Duck Lake Dam, Ashley National Forest, 4.4 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

  15. 7. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING EAST - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  16. 5. VIEW SHOWING DOWNSTREAM FACE DAM, LOOKING SOUTHEAST High ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. VIEW SHOWING DOWNSTREAM FACE DAM, LOOKING SOUTHEAST - High Mountain Dams in Upalco Unit, Milk Lake Dam, Ashley National Forest, 9.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  17. 2. VIEW SHOWING UPSTREAM FACE OF DAM, WITHOUT OUTLET GATE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW SHOWING UPSTREAM FACE OF DAM, WITHOUT OUTLET GATE IN BACKGROUND, LOOKING NORTHEAST - High Mountain Dams in Upalco Unit, Five Point Lake Dam, Ashley National Forest, 12 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  18. 6. VIEW OF WOOD MEASURING BOX DOWNSTREAM FROM DAM, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW OF WOOD MEASURING BOX DOWNSTREAM FROM DAM, LOOKING SOUTH - High Mountain Dams in Upalco Unit, Deer Lake Dam, Ashley National Forest, 5.8 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  19. 2. VIEW OF UPSTREAM FACE OF DAM, LOOKING EAST ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW OF UPSTREAM FACE OF DAM, LOOKING EAST - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  20. 5. VIEW OF WOOD MEASURING BOX DOWNSTREAM FROM DAM, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. VIEW OF WOOD MEASURING BOX DOWNSTREAM FROM DAM, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, Deer Lake Dam, Ashley National Forest, 5.8 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  1. 3. VIEW SHOWING UPSTREAM FACE OF DAM, WITH SPILLWAY IN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW SHOWING UPSTREAM FACE OF DAM, WITH SPILLWAY IN BACKGROUND, LOOKING SOUTHWEST - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  2. 3. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, Clements Lake Dam, Ashley National Forest, 6.5 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

  3. 2. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE, LOOKING SOUTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE, LOOKING SOUTH - High Mountain Dams in Upalco Unit, Milk Lake Dam, Ashley National Forest, 9.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  4. 1. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE, WITH SPILLWAY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE, WITH SPILLWAY IN FOREGROUND, LOOKING SOUTHWEST - High Mountain Dams in Upalco Unit, Deer Lake Dam, Ashley National Forest, 5.8 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  5. GENERAL VIEW OF THE WILSON DAM, LOOKING SOUTHEAST, GENERATING PLANT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL VIEW OF THE WILSON DAM, LOOKING SOUTHEAST, GENERATING PLANT IN THE BACKGROUND. - Wilson Dam & Hydroelectric Plant, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

  6. 77 FR 67813 - Sam Rayburn Dam Project Power Rate

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-14

    ...Southwestern Power Administration Sam Rayburn Dam Project Power Rate AGENCY: Southwestern...existing power rate for the Sam Rayburn Dam Project (Rayburn), Rate Schedule SRD-08...Hydro Power and Energy Sold to Sam Rayburn Dam Electric Cooperative, Inc., for a...

  7. 77 FR 9265 - Glen Canyon Dam Adaptive Management Work Group

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-16

    ...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

  8. 78 FR 47695 - Sam Rayburn Dam Power Rate

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-06

    ...Southwestern Power Administration Sam Rayburn Dam Power Rate AGENCY: Southwestern Power Administration...SUMMARY: The current Sam Rayburn Dam Project rate was approved by the Federal...Southwestern has developed a proposed Sam Rayburn Dam rate to recover the required...

  9. 76 FR 24516 - Glen Canyon Dam Adaptive Management Work Group

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-02

    ...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

  10. 77 FR 43117 - Glen Canyon Dam Adaptive Management Work Group

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-23

    ...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

  11. 77 FR 22801 - Glen Canyon Dam Adaptive Management Work Group

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-17

    ...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

  12. 78 FR 7810 - Glen Canyon Dam Adaptive Management Work Group

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-04

    ...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

  13. 78 FR 21415 - Glen Canyon Dam Adaptive Management Work Group

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-10

    ...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

  14. 7. DETAIL VIEW OF DAM, SHOWING ROLLER GATES, GATE PIERS, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. DETAIL VIEW OF DAM, SHOWING ROLLER GATES, GATE PIERS, HEADHOUSES AND DAM BRIDGE, LOOKING NORTHWEST, UPSTREAM - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, Crawford County, WI

  15. 5. DETAIL VIEW OF DAM, SHOWING ROLLER AND TAINTER GATES, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. DETAIL VIEW OF DAM, SHOWING ROLLER AND TAINTER GATES, GATE PIERS, HEADHOUSES AND DAM BRIDGE, LOOKING NORTHWEST, UPSTREAM - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, Crawford County, WI

  16. View of upstream face of Lake Sabrina Dam showing the ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of upstream face of Lake Sabrina Dam showing the redwood planks and base of dam from Lake Sabrina Basin, view north - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

  17. 3. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE AND OUTLET ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE AND OUTLET GATE, LOOKING NORTH - High Mountain Dams in Upalco Unit, Bluebell Lake Dam, Ashley National Forest, 11.2 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  18. 2. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE AND OUTLET ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE AND OUTLET GATE, LOOKING SOUTHEAST - High Mountain Dams in Upalco Unit, Bluebell Lake Dam, Ashley National Forest, 11.2 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  19. 11. 'CONSTRUCTION OF TRIAL LAKE DAM OF THE UNION RESERVOIR ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. 'CONSTRUCTION OF TRIAL LAKE DAM OF THE UNION RESERVOIR CO., SEPTEMBER 7, 1912, AT 20 FEET ABOVE OUTLET. C.S. JARVIS, ENG.' - High Mountain Dams in Bonneville Unit, Trial Lake Dam, Kamas, Summit County, UT

  20. 3. VIEW SHOWING CREST AND UPSTREAM FACE OF DAM, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW SHOWING CREST AND UPSTREAM FACE OF DAM, LOOKING SOUTH - High Mountain Dams in Upalco Unit, Brown Duck Lake Dam, Ashley National Forest, 4.4 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

  1. 1. OVERALL VIEW OF SUPERIOR LAKE, WITH DAM SPILLWAY IN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. OVERALL VIEW OF SUPERIOR LAKE, WITH DAM SPILLWAY IN FOREGROUND, LOOKING NORTHWEST - High Mountain Dams in Upaco Unit, Superior Lake Dam, Ashley National Forest, 12.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  2. 4. VIEW SHOWING DOWNSTREAM FACE OF DAM, LOOKING SOUTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW SHOWING DOWNSTREAM FACE OF DAM, LOOKING SOUTH - High Mountain Dams in Upalco Unit, Bluebell Lake Dam, Ashley National Forest, 11.2 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  3. 1. OVERALL VIEW OF FIVE POINT LAKE AND DAM, SHOWING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. OVERALL VIEW OF FIVE POINT LAKE AND DAM, SHOWING UPSTREAM FACE, LOOKING SOUTHWEST - High Mountain Dams in Upalco Unit, Five Point Lake Dam, Ashley National Forest, 12 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  4. 8. VIEW OF DAM 83, SHOWING OLD SOURIS RIVER CHANNEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. VIEW OF DAM 83, SHOWING OLD SOURIS RIVER CHANNEL FROM THE DOWNSTREAM FACE OF THE DAM WITH POND A IN THE BACKGROUND, LOOKING SOUTH - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

  5. 4. VIEW, LOOKING SOUTHWEST, SHOWING A LARGE FIELDSTONE DAM (KNOWN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW, LOOKING SOUTHWEST, SHOWING A LARGE FIELD-STONE DAM (KNOWN LOCALLY AS DAM NO. 1), BUILT BY THE CCC - J. Clark Salyer National Wildlife Refuge Dams, Along Lower Souris River, Kramer, Bottineau County, ND

  6. 3. VIEW, LOOKING NORTHEAST, SHOWING A SMALL FIELDSTONE DAM (KNOWN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW, LOOKING NORTHEAST, SHOWING A SMALL FIELD-STONE DAM (KNOWN LOCALLY AS DAM NO. 2), BUILT BY THE CCC - J. Clark Salyer National Wildlife Refuge Dams, Along Lower Souris River, Kramer, Bottineau County, ND

  7. Time-Lapse Seismic Tomography and Electrical Resistivity Mapping of a Small Embankment Dam with Possible Zones of Weakness

    NASA Astrophysics Data System (ADS)

    Wodajo, L. T.; Hickey, C. J.; Song, C. R.

    2013-12-01

    Earthen dam or levee failure can occur with little to no warning. Internal problems such as seepage and piping are among the major causes of failure in earthen embankment dams and levees. Identifying and mitigating these problems requires a cost effective and non-invasive method of investigating these critical structures. This study focuses on the early detection of internal problems such as seepage and piping using time lapse seismic refraction tomography (SRT) and electrical resistivity tomography (ERT). For this study, two quarter scale model dams were built at the USDA-ARS Hydraulic Engineering Research Unit in Stillwater, OK. These dams were constructed with two internal compromised zones that would be susceptible to seepage and piping. The zones consist of a sandy region and a region compacted at lower moisture content. Time lapse seismic refraction and electrical resistivity measurements were conducted over a course of two years to monitor changes in the internal structure of the model dams due to seasonal changes, cyclic loadings and internal erosion failure. The results will provide an insight on how compromised zones due to seepage and piping can be identified at an early stage using both SRT and ERT time-lapse measurements and how joint interpretation of these two methods helps in closely identifying what attributed to the compromised zone. [This research was funded by the department of Homeland Security- sponsored Southeast Region Research Initiative (SERRI) at the Department of Energy's Oak Ridge National Laboratory.

  8. 76 FR 34799 - Permanent Dam Safety Modification at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams, TN

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-14

    ...TENNESSEE VALLEY AUTHORITY Permanent Dam Safety Modification at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams, TN AGENCY: Tennessee Valley Authority...permanent modifications to the existing dam facilities at Cherokee, Fort...

  9. 76 FR 25310 - Intent To Prepare an Environmental Impact Statement for the Zoar Levee and Diversion Dam, Dam...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-04

    ...Environmental Impact Statement for the Zoar Levee and Diversion Dam, Dam Safety Modification Study, Tuscarawas County, OH AGENCY...reliability risks associated with Zoar Levee and Diversion Dam. These high hazard structures do not meet current...

  10. 78 FR 60271 - Hollow Dam Power Company; Ampersand Hollow Dam Hydro, LLC; Notice of Application for Transfer of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-01

    ...Regulatory Commission [Project No. 6972-032] Hollow Dam Power Company; Ampersand Hollow Dam Hydro, LLC; Notice of Application for Transfer...Motions To Intervene On September 10, 2013, Hollow Dam Power Company (transferor) and Ampersand...

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

    SciTech Connect

    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.

  12. OVERVIEW OF DAM GULLY EROSION RESEARCH

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Traditionally gully erosion has been identified with the dissection of the landscape in agricultural settings, but it is also recognized as a prevalent erosion feature in earthen dam auxiliary spillways and embankments. Flows through earthen spillways and over dam embankments, due to large rainfall...

  13. Estimating flow through an earthen dam

    NSDL National Science Digital Library

    Kaye Savage

    Students make measurements of dam dimensions and water levels above and below a small, accessible earthen dam. They assess the soil texture in the field. They follow up by developing a simple flow net and estimating seepage rate as part of a problem set. They discuss their assumptions and the likely sources and magnitude of error.

  14. The design of avalanche protection dams

    E-print Network

    Boyer, Edmond

    The design of avalanche protection dams Recent practical & theoretical developments://ec.europa.eu/research/research-eu #12;The design of avalanche protection dams Recent practical and theoretical developments Edited by T 3 CEMAGREF, Research Division on Torrents, Snow and Avalanches, ETNA 4 FLOW-ING s.r.l. 5 Austrian

  15. Detecting fluid leakage of a reservoir dam based on streaming self-potential measurements

    NASA Astrophysics Data System (ADS)

    Song, Seo Young; Kim, Bitnarae; Nam, Myung Jin; Lim, Sung Keun

    2015-04-01

    Between many reservoir dams for agriculture in suburban area of South Korea, water leakage has been reported several times. The dam under consideration in this study, which is located in Gyeong-buk, in the south-east of the Korean Peninsula, was reported to have a large leakage at the right foot of downstream side of the reservoir dam. For the detection of the leakage, not only geological survey but also geophysical explorations have been made for precision safety diagnosis, since the leakage can lead to dam failure. Geophysical exploration includes both electrical-resistivity and self-potential surveys, while geological surveys water permeability test, standard penetration test, and sampling for undisturbed sample during the course of the drilling investigation. The geophysical explorations were made not only along the top of dam but also transverse the heel of dam. The leakage of water installations can change the known-heterogeneous structure of the dam body but also cause streaming spontaneous (self) potential (SP) anomaly, which can be detected by electrical resistivity and SP measurements, respectively. For the interpretation of streaming SP, we used trial-and-error method by comparing synthetic SP data with field SP data for model update. For the computation, we first invert the resistivity data to obtain the distorted resistivity structure of the dam levee then make three-dimensional electrical-resistivity modeling for the streaming potential distribution of the dam levee. Our simulation algorithm of streaming SP distribution based on the integrated finite difference scheme computes two-dimensional (2D) SP distribution based on the distribution of calculated flow velocities of fluid for a given permeability structure together with physical properties. This permeability is repeatedly updated based on error between synthetic and field SP data, until the synthetic data match the field data. Through this trial-and-error-based SP interpretation, we locate the leakage of reservoir-water formed locally inside the levee body of the reservoir dam within the limitation due to the 2D nature of stream SP simulation.

  16. [Limnetic zooplankton run-off a high-head dam and their fate in a river with high current velocity (case of the Krasnoiarsk hydroelectric power station on the Yenisei river].

    PubMed

    Dubovskaia, O P; Gladyshev, M I; Makhutova, O N

    2004-01-01

    The vertical distribution of net zooplankton in head-water of Krasnoyarsk hydroelectric power station and its horizontal distribution in the tail-water were studied during two years in winter and summer seasons. In order to distinguish living and dead individuals the special staining was used. It was revealed that on average 77% of living plankton pass through high-head dam with deep water scoop to the tailwater. While passing through dam aggregates some individuals of the reservoir plankton are traumatized and die, that results in some increase of portion of dead individuals in the tail water near dam (from 3 to 6%). Alive zooplankton passed through the dam aggregates is eliminated under the Upper Yenisei highly turbulent conditions. There is approximately 10% of it in 32 km from the dam if compare with biomass in 20-40 m layer of reservoir, the portion of dead increases to 11%. The biomass of zooplankton suspended in the water column of the tail-water sometimes increases (till > 1 g/m3) due to large Copepoda Heteroscope borealis, which inhabits near-bottom and near-shore river zones and can be found in the central part of the river during reproductive period. Limnetic zooplankton from the reservoir cannot be considered as important food for planktivores in the tail-water. PMID:15032067

  17. Cliff Failure

    USGS Multimedia Gallery

    Cliff failure just south of San Gregorio Beach. Slide is 18.3 meters (60 ft) high and displaces approximately 6881 cubic meters (9,000 cubic yards) of material. Large boulders are 1 m (3 ft) across....

  18. Heart Failure

    MedlinePLUS

    ... this? Submit What's this? Submit Button Related CDC Web Sites Heart Disease Stroke High Blood Pressure Salt ... to Prevent and Control Chronic Diseases Million Hearts® Web Sites with More Information About Heart Failure For ...

  19. Dams on the Mekong: Cumulative sediment starvation

    NASA Astrophysics Data System (ADS)

    Kondolf, G. M.; Rubin, Z. K.; Minear, J. T.

    2014-06-01

    The Mekong River, largely undeveloped prior to 1990, is undergoing rapid dam construction. Seven dams are under construction on the mainstem in China and 133 proposed for the Lower Mekong River and tributaries. We delineated nine distinct geomorphic regions, for which we estimated sediment yields based on geomorphic characteristics, tectonic history, and the limited sediment transport data available. We then applied the 3W model to calculate cumulative sediment trapping by these dams, accounting for changing trap efficiency over time and multiple dams on a single river system. Under a "definite future" scenario of 38 dams (built or under construction), cumulative sediment reduction to the Delta would be 51%. Under full build-out of all planned dams, cumulative sediment trapping will be 96%. That is, once in-channel stored sediment is exhausted, only 4% of the predam sediment load would be expected to reach the Delta. This scenario would have profound consequences on productivity of the river and persistence of the Delta landform itself, and suggests that strategies to pass sediment through/around dams should be explored to prevent the consequences of downstream sediment starvation.

  20. The geomagnetic tail

    SciTech Connect

    Birn, J. (USAF, Geophysics Laboratory, Hanscom AFB, MA (United States))

    1991-01-01

    A review is presented of the plasma sheet and lobe regions of the magnetotail, focusing principally on large-scale processes or microprocesses with some large-scale effects. Consideration is given to quiet and average structures, not necessarily related to activity phases, with quasi-steady convection aspects, and with the characteristics of dynamic phases including acceleration mechanisms and single particle aspects. Attention is given to various activity models, average and quiet time properties, properties and effects of magnetospheric convection, dynamics of the magnetotail, and the near tail, substorm current wedge.

  1. Trapping efficiency of three types check dams experiment

    NASA Astrophysics Data System (ADS)

    Huang, Hui-Kai; CHEN, Su-Chin; AN, Hsuan-Pei

    2015-04-01

    The check dams constructed to trap debris flow. This study divide check dams into three types as closed-type check dam, slit dam, and modular steel check dam. Closed-type check dam which can trap all kind of sediment or driftwood. Slit check dam is permeable dam, so it can prevent from depositing all of sediment or driftwood. A modular steel check dam improves the existing hard-to-change disadvantages of slit dam structure. The assembling of longitudinal and transverse beams can be constructed independently, and then it could be freely configured to form a flexibly adjustable modular steel check dam. This study used the laws of geometric similitude to design model of dam. To explore the trapping mechanisms and phenomenon in different dismantle transverse beams conditions and compared the trapping efficiency with different type of check dams. This study used different volume ratio with driftwood and sediment. In order to capture the trace of debris flow and calculate accuracy velocity of debris flow the study used several high-speed photography combining the method of 3D Remodeling from Motion Structure with Multi-View Stereo which constructed with multiple photos of overlapping coefficient at least 70% and established three-dimensional system of coordinate in laboratory experiment. As a result, the driftwood deposition rate of modular steel check dam increase 60% than slit dam and 40% than closed-type dam; the debris deposition rate increase 30% than slit dam. In addition, the increment of driftwood volume ratio led to the increment of trapping efficiency of three type of check dams. Meanwhile slit dam is the most effective type in trapping driftwood and sediment with more than 50% of increased rate, because of more driftwood flow through the slit dam jam together easily. Finally, transverse beams which installed the modular steel check dam can suppress the upward movement of driftwood, therefore driftwood can easily form the arched stacking efficiency with transverse beams and enhance the trapping effect.

  2. Numerical Modeling of Dam Break\\/Removal Hydraulics and Morphology

    Microsoft Academic Search

    S. Li; C. J. Duffy

    2007-01-01

    Dam break hydraulic is drawing increasing attention due to the potential occurrence of extreme hydrological events as result of climate change and its catastrophic nature (Cao et al, 2004). On the other hand, many dams have been removed and more are under consideration of removal (Cui et al., 2006). Both dam break and dam removal have the same essential properties

  3. 8. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH MOVING TO CONSTRUCT DAM, LOOKING NORTH - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  4. 53. AVALON DAM Photographic copy of historic photo, August ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    53. AVALON DAM - Photographic copy of historic photo, August 9, 1893 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'EDDY DAM. LOOKING EAST.' VIEW OF COLLAPSED DAM - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  5. 7. SOUTHEAST VIEW OF BIG DALTON DAM SHOWING THE MULTIPLE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. SOUTHEAST VIEW OF BIG DALTON DAM SHOWING THE MULTIPLE ARCHES, AN UPSTREAM VIEW OF THE PARAPET WALL ALONG THE CREST OF THE DAM, AND THE SHELTER HOUSE AT THE EAST END OF THE DAM. - Big Dalton Dam, 2600 Big Dalton Canyon Road, Glendora, Los Angeles County, CA

  6. 66. AVALON DAM Photographic copy of historic photo, May ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    66. AVALON DAM - Photographic copy of historic photo, May 22, 1908 (original print filed in Record Group 115, National Archives, Washington, D.C.) W.J.Lubken, photographer 'VIEW LOOKING EAST FROM WEST END OF AVALON DAM, SHOWING DOWNSTREAM FACE OF DAM' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  7. 6. DAM AFTERBAY, WITH OWYEE RIVER IN FOREGROUND, SHOWING OUTLET ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. DAM AFTERBAY, WITH OWYEE RIVER IN FOREGROUND, SHOWING OUTLET TUNNEL PORTAL (LEFT) AND POWERHOUSE AND ENTRANCE PORTAL TO DAM INTERIOR (RIGHT). NOTE RELEASE OF WATER FROM NEEDLE VALVE NUMBER 2 IN VALVEHOUSE ON DAM. VIEW TO SOUTHEAST. - Owyhee Dam, Across Owyhee River, Nyssa, Malheur County, OR

  8. 8. WEST DAM, LOOKING DUE NORTH OVER TOP OF WEST ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. WEST DAM, LOOKING DUE NORTH OVER TOP OF WEST DAM, SHOWING RELATIONSHIP BETWEEN OUTLET TO RIGHT OF DAM, NEW PUMP PLANT BUILDING AND CANAL TO LEFT OF DAM. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

  9. 9. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH MOVING TO CONSTRUCT DAM, LOOKING EAST - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

  10. 46. Photocopy of photograph, c. 1933. VIEW OF DAM AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    46. Photocopy of photograph, c. 1933. VIEW OF DAM AND FOREBAY. NOTE ALL WATER FLOWING THROUGH FOREBAY AND OUT EITHER TAILRACE OR SLUICE GATE (INSTEAD OF OVER DAM) BECAUSE OF LOW WATER FLOW. (Courtesy of the Potomac Edison Company Library (Hagerstown, MD), Historical Data Files, Dam No. 5 listing - Dam No. 5 Hydroelectric Plant, On Potomac River, Hedgesville, Berkeley County, WV

  11. 43. Credit TR. Reconstruction of Dam No. 4 after 1936 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    43. Credit TR. Reconstruction of Dam No. 4 after 1936 flood. Pouring concrete for new dam section; opening at left for flume to remove water from behind coffer dam. Photo c. 1936 - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

  12. 2. Overview of the Lost River Diversion Dam House complex ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Overview of the Lost River Diversion Dam House complex taken from west edge of horseshoe-shaped Lost River Diversion Dam. Interior of east side of dam in the foreground. Facing East. - Klamath Basin Project, Lost River Diversion Dam House, Lost River near intersection of State Highway 140 & Hill Road, Klamath Falls, Klamath County, OR

  13. 4. VIEW OF DOWNSTREAM FACE OF DAM, WITH SCARS FROM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW OF DOWNSTREAM FACE OF DAM, WITH SCARS FROM EARTH MOVING TO CONSTRUCT DAM IN FOREGROUND, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, Five Point Lake Dam, Ashley National Forest, 12 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  14. dam logic: qualitative reasoning about benthic macroinvertebrate responses

    E-print Network

    Tullos, Desiree

    dam logic: qualitative reasoning about benthic macroinvertebrate responses to dam removal desiree reliability of biotic and abiotic indicators (e.g. responsiveness to dam removal, detectability, feasibility relationships "there appears to be a wide range of ecological responses to dam removal. It is therefore

  15. Design of a Sediment Mitigation System for Conowingo Dam

    E-print Network

    Design of a Sediment Mitigation System for Conowingo Dam Rayhan Ain, Kevin Cazenas, Sheri Gravette with the Dam. During these events, the sediment build up at Conowingo Dam in the Lower Susquehanna River has the best mitigation technique to address the scouring of sediment at Conowingo Dam. Design alternatives

  16. Three-Gorges Dam: Risk to Ancient Fish

    E-print Network

    Wu, Jianguo "Jingle"

    Three-Gorges Dam: Risk to Ancient Fish THE HUGETHREE-GORGES DAM (TGD) OFTHE Yangtze River is going and animals, as discussed by J. Wu et al. in their Policy Forum "Three-Gorges Dam-- experiment in habitat). The construction of the Gezhou Dam (38 km downstream from the TGD) in 1981 led to sharp declines in the popula

  17. ImpactsofLarge Dams:agLobaL

    E-print Network

    Chaudhuri, Sanjay

    #12;ImpactsofLarge Dams:agLobaL assessment Editors Cecilia Tortajada, Dogan Altinbilek, Asit K of the most controversial issues of the water sector in recent years has been the impacts of large dams and environmental costs of large dams far exceed their benefits, and that the era of construction of large dams

  18. Weighing a dam's economic and environmental impact

    NASA Astrophysics Data System (ADS)

    Showstack, Randy

    While some people claim that it was a publicity stunt or criticize it as an economic loss and a move in the wrong direction, the breaching of the low-slung Edwards Dam on July 1 has changed the landscape of the Kennebec River flowing through Augusta, Maine, and may also change the landscape for some other dammed rivers nationwide.The breaching marks the first time that the Federal Energy Regulatory Commission (FERC), which licenses nonfederal hydroelectric projects, has ruled that a dam should be removed because the environmental damage that it causes outweighs its economic benefits.

  19. Failure rates of regenerative systems with heavy tails

    Microsoft Academic Search

    S. Asmussen; V. Kalashnikov

    1999-01-01

    Let ?t be a regenerative process and assume that, at each state x, the process can fail with intensity ?(x). If the inter-regeneration\\u000a times have a finite exponential moment orinf\\u000a x?(x)>0, then ?(?t) tends to some limiting positive intensity as t?? (under mild additional restrictions). This fact is widely used in engineering\\u000a because the limiting intensity can be employed in

  20. Dam-breach analysis and flood-inundation mapping for Lakes Ellsworth and Lawtonka near Lawton, Oklahoma

    USGS Publications Warehouse

    Rendon, Samuel H.; Ashworth, Chad E.; Smith, S. Jerrod

    2012-01-01

    Dams provide beneficial functions such as flood control, recreation, and reliable 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 misoperation 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 the emergency response if a dam breach occurs. Accurate topographic data are vital for developing flood-inundation maps. This report presents results of a cooperative study by the city of Lawton, Oklahoma, and the U.S. Geological Survey (USGS) to model dam-breach scenarios at Lakes Ellsworth and Lawtonka near Lawton and to map the potential flood-inundation areas of such dam breaches. To assist the city of Lawton with completion of the emergency action plans for Lakes Ellsworth and Lawtonka Dams, the USGS collected light detection and ranging (lidar) data that were used to develop a high-resolution digital elevation model and a 1-foot contour elevation map for the flood plains downstream from Lakes Ellsworth and Lawtonka. This digital elevation model and field measurements, streamflow-gaging station data (USGS streamflow-gaging station 07311000, East Cache Creek near Walters, Okla.), and hydraulic values were used as inputs for the dynamic (unsteady-flow) model, Hydrologic Engineering Center's River Analysis System (HEC-RAS). The modeled flood elevations were exported to a geographic information system to produce flood-inundation maps. Water-surface profiles were developed for a 75-percent probable maximum flood scenario and a sunny-day dam-breach scenario, as well as for maximum flood-inundation elevations and flood-wave arrival times for selected bridge crossings. Some areas of concern near the city of Lawton, if a dam breach occurs at Lakes Ellsworth or Lawtonka, include water treatment plants, wastewater treatment plants, recreational areas, and community-services offices.

  1. EVOLVING EXPECTATIONS OF DAM REMOVAL OUTCOMES: DOWNSTREAM GEOMORPHIC EFFECTS FOLLOWING REMOVAL OF A SMALL, GRAVEL-FILLED DAM1

    E-print Network

    Tullos, Desiree

    EVOLVING EXPECTATIONS OF DAM REMOVAL OUTCOMES: DOWNSTREAM GEOMORPHIC EFFECTS FOLLOWING REMOVAL OF A SMALL, GRAVEL-FILLED DAM1 Kelly Kibler, Desiree Tullos, and Mathias Kondolf 2 ABSTRACT: Dam removal is a promising river restoration technique, particularly for the vast number of rivers impounded by small dams

  2. The Hoover Dam: Lonely Lands Made Fruitful

    NSDL National Science Digital Library

    Project designer Janet Haven of the University of Virginia American Studies Program presents the construction of the Hoover Dam as an alternative narrative to the devastation of the Great Depression in her photoessay, The Hoover Dam: Lonely Lands Made Fruitful. Five slide shows created in Flash2 cover the construction from diverting the Colorado River to pouring concrete and adding the final touches to a completed dam. The slide shows are prefaced by historical background, including short essays on topics such as the Dam as the "Machine in the Desert" and the text of Franklin D. Roosevelt's Dedication Speech upon completion, September 30, 1935. Images of maps and plans are linked throughout, and a list of Works Consulted gives concise source descriptions as well as ideas for further reading.

  3. SUBAQUEOUS DISPOSAL OF MILL TAILINGS

    Microsoft Academic Search

    Neeraj K. Mendiratta; Roe-Hoan Yoon; Paul Richardson

    1999-01-01

    A study of mill tailings and sulfide minerals was carried out in order to understand their behavior under subaqueous conditions. A series of electrochemical experiments, namely, cyclic voltammetry, electrochemical impedance spectroscopy and galvanic coupling tests were carried out in artificial seawater and in pH 6.8 buffer solutions with chloride and ferric salts. Two mill tailings samples, one from the Kensington

  4. Heavy Tails Tail Density Archimedean and t Copulas Tail Densities of Vines Concluding Remarks Tail Densities of Copulas and Extremal

    E-print Network

    Li, Haijun

    that µ(B) = 0 (Resnick, 2007). Haijun Li Tail Densities of Copulas and Extremal Dependence MMR2011 Densities of Copulas and Extremal Dependence Haijun Li (Joint work with Peiling Wu) Department of Mathematics Washington State University MMR2011, Beijing Haijun Li Tail Densities of Copulas and Extremal

  5. Geophysical investigations of geology and structure at the Martis Creek Dam, Truckee, California

    NASA Astrophysics Data System (ADS)

    Bedrosian, Paul A.; Burton, Bethany L.; Powers, Michael H.; Minsley, Burke J.; Phillips, Jeffrey D.; Hunter, Lewis E.

    2012-02-01

    A recent evaluation of Martis Creek Dam highlighted the potential for dam failure due to either seepage or an earthquake on nearby faults. In 1972, the U.S. Army Corps of Engineers constructed this earthen dam, located within the Truckee Basin to the north of Lake Tahoe, CA for water storage and flood control. Past attempts to raise the level of the Martis Creek Reservoir to its design level have been aborted due to seepage at locations downstream, along the west dam abutment, and at the base of the spillway. In response to these concerns, the U.S. Geological Survey has undertaken a comprehensive suite of geophysical investigations aimed at understanding the interplay between geologic structure, seepage patterns, and reservoir and groundwater levels. This paper concerns the geologic structure surrounding Martis Creek Dam and emphasizes the importance of a regional-scale understanding to the interpretation of engineering-scale geophysical data. Our studies reveal a thick package of sedimentary deposits interbedded with Plio-Pleistocene volcanic flows; both the deposits and the flows are covered by glacial outwash. Magnetic field data, seismic tomography models, and seismic reflections are used to determine the distribution and chronology of the volcanic flows. Previous estimates of depth to basement (or the thickness of the interbedded deposits) was 100 m. Magnetotelluric soundings suggest that electrically resistive bedrock may be up to 2500 m deep. Both the Polaris Fault, identified outside of the study area using airborne LiDAR, and the previously unnamed Martis Creek Fault, have been mapped through the dam area using ground and airborne geophysics. Finally, as determined by direct-current resistivity imaging, time-domain electromagnetic sounding, and seismic refraction, the paleotopography of the interface between the sedimentary deposits and the overlying glacial outwash plays a principal role both in controlling groundwater flow and in the distribution of the observed seepage.

  6. Geophysical investigations of geology and structure at the Martis Creek Dam, Truckee, California

    USGS Publications Warehouse

    Bedrosian, P.A.; Burton, B.L.; Powers, M.H.; Minsley, B.J.; Phillips, J.D.; Hunter, L.E.

    2012-01-01

    A recent evaluation of Martis Creek Dam highlighted the potential for dam failure due to either seepage or an earthquake on nearby faults. In 1972, the U.S. Army Corps of Engineers constructed this earthen dam, located within the Truckee Basin to the north of Lake Tahoe, CA for water storage and flood control. Past attempts to raise the level of the Martis Creek Reservoir to its design level have been aborted due to seepage at locations downstream, along the west dam abutment, and at the base of the spillway. In response to these concerns, the U.S. Geological Survey has undertaken a comprehensive suite of geophysical investigations aimed at understanding the interplay between geologic structure, seepage patterns, and reservoir and groundwater levels. This paper concerns the geologic structure surrounding Martis Creek Dam and emphasizes the importance of a regional-scale understanding to the interpretation of engineering-scale geophysical data. Our studies reveal a thick package of sedimentary deposits interbedded with Plio-Pleistocene volcanic flows; both the deposits and the flows are covered by glacial outwash. Magnetic field data, seismic tomography models, and seismic reflections are used to determine the distribution and chronology of the volcanic flows. Previous estimates of depth to basement (or the thickness of the interbedded deposits) was 100 m. Magnetotelluric soundings suggest that electrically resistive bedrock may be up to 2500 m deep. Both the Polaris Fault, identified outside of the study area using airborne LiDAR, and the previously unnamed Martis Creek Fault, have been mapped through the dam area using ground and airborne geophysics. Finally, as determined by direct-current resistivity imaging, time-domain electromagnetic sounding, and seismic refraction, the paleotopography of the interface between the sedimentary deposits and the overlying glacial outwash plays a principal role both in controlling groundwater flow and in the distribution of the observed seepage.

  7. Heart Failure Overview

    MedlinePLUS

    CHF; Congestive heart failure; Left-sided heart failure; Right-sided heart failure - Cor pulmonale; Cardiomyopathy - heart failure ... Heart failure is often a long-term (chronic) condition, but it may come on suddenly. It can ...

  8. Crosshole seismic tomography across a masonry dam

    NASA Astrophysics Data System (ADS)

    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.

  9. Runaway tails in magnetized plasmas

    NASA Technical Reports Server (NTRS)

    Moghaddam-Taaheri, E.; Vlahos, L.; Rowland, H. L.; Papadopoulos, K.

    1985-01-01

    The evolution of a runaway tail driven by a dc electric field in a magnetized plasma is analyzed. Depending on the strength of the electric field and the ratio of plasma to gyrofrequency, there are three different regimes in the evolution of the tail. The tail can be (1) stable with electrons accelerated to large parallel velocities, (2) unstable to Cerenkov resonance because of the depletion of the bulk and the formation of a positive slope, (3) unstable to the anomalous Doppler resonance instability driven by the large velocity anisotropy in the tail. Once an instability is triggered (Cerenkov or anomalous Doppler resonance) the tail relaxes into an isotropic distribution. The role of a convection type loss term is also discussed.

  10. Heart Failure

    Microsoft Academic Search

    Susan Isakson BA; Alan Maisel

    Decompensated congestive heart failure (CHF) is a clinical syndrome often characterized by elevated left ventricular fi lling pressures (LVEDP). Therapy for decompensated CHF aims at normalizing fi lling pressures and thereby improves both symptoms and outcomes. However, therapy guided by direct measurements of fi lling pressure is not practical in most patients, focusing attention on non-invasive surrogate measures of LVEDP

  11. Delineation of subsurface structures using resistivity, VLF and radiometric measurement around a U-tailings pond and its hydrogeological implication

    NASA Astrophysics Data System (ADS)

    Banerjee, K. S.; Sharma, S. P.; Sarangi, A. K.; Sengupta, D.

    The hydrogeological characteristics of the uranium mill tailings pond in the vicinity of Jaduguda (Jharkhand, India) were investigated to examine possible contamination and suggest suitable remedial measures, if required. As the hydrogeological characteristics of subsurface geology are closely related to the electrical properties of the subsurface, geophysical measurements using electrical resistivity coupled with Very Low Frequency electromagnetic method and radiation study were used to investigate the geophysical and geological condition of mill tailings in order to characterize the subsurface structures of the tailings pond. The resistivity interpretation depicted the thickness of the soil cover and thickness of tailings in the pond, as well as the depth to the basement. It also suggested the possible flow direction of leachate. It was observed that the resistivity of the top layer decreases in the direction opposite to the dam axis, which in turn, indicated that the groundwater movement occurs in the opposite direction of the dam axis (in the northwest direction). The VLF method depicted the fractures through which groundwater moves, and also showed the current density alignment in the northwest direction at 10 m depth. The radiation measurement showed relatively higher counts in the northwest direction. This correlated well with the resistivity measurement. The current density at a depth of 20 m showed a closed contour suggesting no groundwater movement in the area at this depth, and that high conductivity material was confined to the tailings area only. It was concluded that groundwater moves in opposite direction of the dam axis at shallower depth only. It was found that continuation of fractures do not extend to deeper depths, which suggested that the tailings storage facility at Jaduguda was reasonably safe from any downward contamination.

  12. Dam nation: A geographic census of American dams and their large-scale hydrologic impacts

    Microsoft Academic Search

    William L. Graf

    1999-01-01

    Newly available data indicate that dams fragment the fluvial system of the continental United States and that their impact on river discharge is several times greater than impacts deemed likely as a result of global climate change. The 75,000 dams in the continental United States are capable of storing a volume of water almost equaling one year's mean runoff, but

  13. Field verification of reconstructed dam-break flood, Laurel Run, Pennsylvania

    USGS Publications Warehouse

    Chen, Cheng-lung; Armbruster, Jeffrey T.

    1979-01-01

    A one-dimensional dam-break flood routing model is verified by using observed data on the flash flood resulting from the failure of Laurel Run Reservoir Dam near Johnstown, Pennsylvania. The model has been developed on the basis of an explicit scheme of the characteristics method with specified time intervals. The model combines one of the characteristic equations with the Rankine-Hugoniot shock equations to trace the corresponding characteristic backward to the known state for solving the depth and velocity of flow at the wave front. The previous version of the model has called for a modification of the method of solution to overcome the computational difficulty at the narrow breach and at any geomorphological constraints where channel geometry changes rapidly. The large reduction in the computational inaccuracies and oscillations was achieved by introducing the actual "storage width" in the equation of continuity and the imaginary "conveyance width" in the equation of motion. Close agreement between observed and computed peak stages at several stations downstream of the dam strongly suggests the validity and applicability of the model. However, small numerical noise appearing in the computed stage and discharge hydrographs at the dam site as well as discrepancy of attenuated peaks in the discharge hydrographs indicate the need for further model improvement.

  14. Methodology for the calculation of annualized incremental risks in systems of dams.

    PubMed

    Serrano-Lombillo, Armando; Escuder-Bueno, Ignacio; de Membrillera-Ortuño, Manuel G; Altarejos-García, Luis

    2011-06-01

    In the past few years, the field of dam safety has approached risk informed methodologies throughout the world and several methodologies and programs are appearing to aid in the systematization of the calculations. The most common way of implementing these calculations is through the use of event trees, computing event probabilities, and incremental consequences. This methodology is flexible enough for several situations, but its generalization to the case of systems of several dams is complex and its implementation in a completely general calculation methodology presents some problems. Retaining the event tree framework, a new methodology is proposed to calculate incremental risks. The main advantage of this proposed methodology is the ease with which it can be applied to systems of several dams: with a single risk model that describes the complete system and with a single calculation the incremental risks of the system can be obtained, being able to allocate the risk of each dam and of each failure mode. The article shows how both methodologies are equivalent and also applies them to a case study. PMID:21175718

  15. [Tail Plane Icing

    NASA Technical Reports Server (NTRS)

    1997-01-01

    The Aviation Safety Program initiated by NASA in 1997 has put greater emphasis in safety related research activities. Ice-contaminated-tailplane stall (ICTS) has been identified by the NASA Lewis Icing Technology Branch as an important activity for aircraft safety related research. The ICTS phenomenon is characterized as a sudden, often uncontrollable aircraft nose- down pitching moment, which occurs due to increased angle-of-attack of the horizontal tailplane resulting in tailplane stall. Typically, this phenomenon occurs when lowering the flaps during final approach while operating in or recently departing from icing conditions. Ice formation on the tailplane leading edge can reduce tailplane angle-of-attack range and cause flow separation resulting in a significant reduction or complete loss of aircraft pitch control. In 1993, the Federal Aviation Authority (FAA) and NASA embarked upon a four-year research program to address the problem of tailplane stall and to quantify the effect of tailplane ice accretion on aircraft performance and handling characteristics. The goals of this program, which was completed in March 1998, were to collect aerodynamic data for an aircraft tail with and without ice contamination and to develop analytical methods for predicting the effects of tailplane ice contamination. Extensive dry air and icing tunnel tests which resulted in a database of the aerodynamic effects associated with tailplane ice contamination. Although the FAA/NASA tailplane icing program generated some answers regarding ice-contaminated-tailplane stall (ICTS) phenomena, NASA researchers have found many open questions that warrant further investigation into ICTS. In addition, several aircraft manufacturers have expressed interest in a second research program to expand the database to other tail configurations and to develop experimental and computational methodologies for evaluating the ICTS phenomenon. In 1998, the icing branch at NASA Lewis initiated a second multi-phase research program for tailplane icing (TIP II) to develop test methodologies and tailplane performance and handling qualities evaluation tools. The main objectives of this new NASA/Industry/Academia collaborative research programs were: (1) define and evaluate a sub-scale wind tunnel test methodology for determining tailplane performance degradation due to icing. (2) develop an experimental database of tailplane aerodynamic performance with and without ice contamination for a range of tailplane configurations. Wind tunnel tests were planned with representative general aviation aircraft, i.e., the Learjet 45, and a twin engine low speed aircraft. This report summarizes the research performed during the first year of the study, and outlines the work tasks for the second year.

  16. Marmot Dam Removal: Predictions and Observations

    NASA Astrophysics Data System (ADS)

    Cui, Y.; Orr, B. K.; Wilcox, A.; Vick, J.; Podolak, C.; Wilcox, P.

    2008-12-01

    The 14-m tall Marmot Dam on the Sandy River, Oregon was removed in the summer of 2007, allowing the approximately 730,000 cubic meters of sand and gravel to remain in the river for natural erosion by the flow. Pre-dam removal studies included sediment transport modeling that simulated several dam removal alternatives and provided key pieces of information that allowed a diverse stakeholder group to unanimously agree on the "blow-and-go" alternative, allowing a large amount of sediment to be released to a major salmonid-bearing river in the Columbia River basin. Although it is still too early to provide a comprehensive evaluation of the model performance because morphological responses in the downstream reaches, if any, are likely years away, observations to date (one year after dam removal) indicate that model predictions are generally accurate. Here we present some of the key findings of pre-dam-removal sediment transport modeling predictions and compare them with post-removal observations.

  17. Hiwassee Dam rehabilitation to combat concrete growth

    SciTech Connect

    Newell, V.A.; Tanner, D.T.; Wagner, C.D. [Tennessee Valley Authority, Chattanooga, TN (United States)

    1995-12-31

    Hiwassee Dam is experiencing concrete growth caused by alkali-aggregate reaction (AAR). The AAR is the alkali-silica tape associated with excessive alkali in the cement and a micaceous quartzite (siliceous) aggregate used in the concrete. Concrete growth at Hiwassee Dam caused by this reaction has resulted in high stresses and deflections within the dam. These stresses and deflections have caused the nonoverflow blocks to deflect into the spillway openings causing the spillway gates to bind. This growth has also caused the spillway bridge expansion joints to close, and structural cracking in the upper portion of the dam. This is a continuation of the paper that was presented at the International conference on Hydropower {open_quotes}WATERPOWER `93{close_quotes} entitled {open_quotes}MODIFICATION AT HIWASSEE DAM DUE TO CONCRETE GROWTH PROBLEMS{close_quotes} Volume 2, page 860 to 869. It presents: The rehabilitation to date, the instrumentation that has been installed to monitor the rehabilitation, and the results of these efforts.

  18. The Remains of the Dam: What Have We Learned From 10 Years of Dam Removals?

    NASA Astrophysics Data System (ADS)

    Grant, G. E.; O'Connor, J. E.; Major, J. J.

    2012-12-01

    Over the past 10 years in the U.S., dam removal has evolved from an occasionally implemented, rarely studied, and poorly understood intervention to improve rivers, to a much more frequently accomplished and better studied and understood approach to river restoration. Over that same time period, the numbers and sizes of dams and volumes of sediment released have dramatically increased. By some estimates close to 1000 dams have been removed over the last 100 years, with most of those occurring within the last 10. While most of these are small (less than 15 m high) dams, removals of dams up to 70 m high are presently underway. Releases of sediment associated with these removals over the past 10 years have also increased by close to four orders of magnitude; for example removal of the Elwha River dams in Washington is estimated to release almost 107 m3 of sediment into the lower Elwha River. Given a decade's worth of dam removals and, in some cases, well-orchestrated case studies of the effects of removal on the geomorphology and (to a lesser extent) ecology of rivers, what have we learned? More specifically, where do we now stand with respect to being able to predict the consequences of future dam removals? Drawing on both field examples and numerical models of dam removals in the western U.S., several key lessons stand out. Although every dam removal and river are different, removals initiate very rapid upstream river response and reservoir erosion and evacuation of sediment by various mechanisms that are strongly controlled by grain size of the deposit, volumes of residual sediment relative to total reservoir volume, and style of dam removal (instantaneous versus staged). Erosion of sediment accumulations in fully and partially filled (by sediment) reservoirs proceeds by different trajectories and rates, with full reservoirs releasing sediment primarily by upstream knickpoint retreat while erosion and sediment release in partially-filled reservoirs proceeds by vertical incision and delta progradation. Coarse grained non-cohesive sediment deposits erode by both vertical incision and lateral migration; fine-grained non-cohesive deposits can slump and fail catastrophically by landsliding. The rate of upstream reservoir erosion sets the tempo of downstream river adjustments and sedimentation. Prediction of location of sediment accumulations is bolstered by both 1- and 2-D hydrodynamic models that have proven to be remarkably accurate in predicting the spatial extent and pattern of deposition, but are less accurate with respect to predicting timing and longevity of deposits.Erosion of Marmot coffer dam on the Sandy River, OR following dam breach, October 19, 2007

  19. Revised Final Independent External Peer Review Report for the East Branch Dam, Clarion River,

    E-print Network

    US Army Corps of Engineers

    Revised Final Independent External Peer Review Report for the East Branch Dam, Clarion River, Elk County, Pennsylvania: Dam Safety Modification Report Prepared by Battelle Memorial Institute Prepared Report East Branch Dam, Clarion River, Elk County, Pennsylvania: Dam Safety Modification Report

  20. 18 Sharp-tailed Grouse

    Microsoft Academic Search

    Paul A. Johnsgard

    2008-01-01

    Tympanuchus phasianellus (Linnaeus) 1858 Other vernacular names: Brush grouse, pintail grouse, prairie grouse, prairie pheasant, sharptail, speckle-belly, spike-tail, spring-tail, whitebelly, white-breasted grouse. Range: Currently from north central Alaska, Yukon, northern Mackenzie, northern Manitoba, northern Ontario, and central Quebec south to eastern Washington, extreme eastern Oregon, Idaho, northeastern Utah, Wyoming, and Colorado, and in the Great Plains from eastern Colorado and

  1. Tail bud determination in the vertebrate embryo

    Microsoft Academic Search

    Abigail S. Tucker; Jonathan M. W. Slack

    1995-01-01

    Background: Although as humans we lose our tails in the second month of embryonic development, a persistent tail is a prominent structural feature of most adult vertebrates. Indeed, the post-anal tail is part of the definition of a chordate. The internal organization of the developing tail — with neural tube, notochord and paired somites — is the same as that

  2. NOVA: Bombing Hitlerâ??s Dams

    NSDL National Science Digital Library

    2012-01-11

    NOVA is well-known for its engaging documentaries and the team delivers once more with â??Bombing Hitlerâ??s Dams.â? Located within the Military + Espionage section of the NOVA site, this episode follows experts as they recreate the 1943 efforts of the â??dam busterâ? pilots and their one-of-a-kind bouncing bomb. A revolutionary secret weapon, the bomb was used to destroy two German dams, effectively cutting off the water supply to vital arms factories during WWII. The entire episode (nearly 2 hours in length) can be viewed here, accompanied by a complete Transcript of the program and Related Links, such as â??D-Dayâ??s Sunken Secretsâ? and â??Escaping a Nazi Prison Camp.â? Visitors can also read through the TV Schedule to view Upcoming Broadcasts or Recent Broadcasts that can all be viewed online and are accompanied by related websites, articles, interviews, slideshows, and other great features.

  3. Dam nation: A geographic census of American dams and their large-scale hydrologic impacts

    NASA Astrophysics Data System (ADS)

    Graf, William L.

    1999-04-01

    Newly available data indicate that dams fragment the fluvial system of the continental United States and that their impact on river discharge is several times greater than impacts deemed likely as a result of global climate change. The 75,000 dams in the continental United States are capable of storing a volume of water almost equaling one year's mean runoff, but there is considerable geographic variation in potential surface water impacts. In some western mountain and plains regions, dams can store more than 3 year's runoff, while in the Northeast and Northwest, storage is as little as 25% of the annual runoff. Dams partition watersheds; the drainage area per dam varies from 44 km2 (17 miles2) per dam in New England to 811 km2 (313 miles2) per dam in the Lower Colorado basin. Storage volumes, indicators of general hydrologic effects of dams, range from 26,200 m3 km-2 (55 acre-feet mile-2) in the Great Basin to 345,000 m3 km-2 (725 acre-feet mile-2) in the South Atlantic region. The greatest river flow impacts occur in the Great Plains, Rocky Mountains, and the arid Southwest, where storage is up to 3.8 times the mean annual runoff. The nation's dams store 5000 m3 (4 acre-feet) of water per person. Water resource regions have experienced individualized histories of cumulative increases in reservoir storage (and thus of downstream hydrologic and ecologic impacts), but the most rapid increases in storage occurred between the late 1950s and the late 1970s. Since 1980, increases in storage have been relatively minor.

  4. Optimizing the dammed: water supply losses and fish habitat gains from dam removal in California.

    PubMed

    Null, Sarah E; Medellín-Azuara, Josué; Escriva-Bou, Alvar; Lent, Michelle; Lund, Jay R

    2014-04-01

    Dams provide water supply, flood protection, and hydropower generation benefits, but also harm native species by altering the natural flow regime and degrading aquatic and riparian habitat. Restoring some rivers reaches to free-flowing conditions may restore substantial environmental benefits, but at some economic cost. This study uses a systems analysis approach to preliminarily evaluate removing rim dams in California's Central Valley to highlight promising habitat and unpromising economic use tradeoffs for water supply and hydropower. CALVIN, an economic-engineering optimization model, is used to evaluate water storage and scarcity from removing dams. A warm and dry climate model for a 30-year period centered at 2085, and a population growth scenario for year 2050 water demands represent future conditions. Tradeoffs between hydropower generation and water scarcity to urban, agricultural, and instream flow requirements were compared with additional river kilometers of habitat accessible to anadromous fish species following dam removal. Results show that existing infrastructure is most beneficial if operated as a system (ignoring many current institutional constraints). Removing all rim dams is not beneficial for California, but a subset of existing dams are potentially promising candidates for removal from an optimized water supply and free-flowing river perspective. Removing individual dams decreases statewide delivered water by 0-2282 million cubic meters and provides access to 0 to 3200 km of salmonid habitat upstream of dams. The method described here can help prioritize dam removal, although more detailed, project-specific studies also are needed. Similarly, improving environmental protection can come at substantially lower economic cost, when evaluated and operated as a system. PMID:24594701

  5. 68. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    68. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: STRESS SHEET, SHEET 4; MAY, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  6. 71. PALMDALE WATER COMPANY, EASTWOOD MULTIPLEARCHED DAM: STRESS SHEET, SHEET ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    71. PALMDALE WATER COMPANY, EASTWOOD MULTIPLE-ARCHED DAM: STRESS SHEET, SHEET 3; DECEMBER 20, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  7. 3. VIEW SOUTHEAST, WEST END OF DAM AT LEFT CENTER, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW SOUTHEAST, WEST END OF DAM AT LEFT CENTER, HEADGATE STRUCTURE AT CENTER - Dayville Mills Hydroelectric Facility, Dam, North side of Route 101, .5 mile west of Route 395, Killingly Center, Windham County, CT

  8. 1. VIEW NORTH, SOUTH FACE OF DAM AT RIGHT CENTER, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. VIEW NORTH, SOUTH FACE OF DAM AT RIGHT CENTER, HEADGATES AND CANAL AT LEFT - Dayville Mills Hydroelectric Facility, Dam, North side of Route 101, .5 mile west of Route 395, Killingly Center, Windham County, CT

  9. 2. VIEW EAST, WEST END OF DAM AT CENTER, HEADGATE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW EAST, WEST END OF DAM AT CENTER, HEADGATE OPERATING MECHANISMS AT LEFT - Dayville Mills Hydroelectric Facility, Dam, North side of Route 101, .5 mile west of Route 395, Killingly Center, Windham County, CT

  10. 9. VIEW OF DAM FROM LEFT SIDE. PUMPCRETE PIPE LINES ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. VIEW OF DAM FROM LEFT SIDE. PUMPCRETE PIPE LINES ARE CARRIED ON WALKWAY. UPSTREAM PARTS OF BUTTRESSES ARE FOG-SPRAYED TO PERMIT PROMPT FILLING OF CONTRACTION JOINTS. July 30, 1938 - Bartlett Dam, Verde River, Phoenix, Maricopa County, AZ

  11. View of powerhouse and dam from third floor of original ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of powerhouse and dam from third floor of original section of Langdale Cotton Mill, looking northeast - Langdale Cotton Mill, Powerhouse & Dam, 5910 Nineteenth Avenue, Valley, Chambers County, AL

  12. 69. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    69. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: REINFORCEMENT SHEET, SHEET 5; MAY, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  13. 66. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    66. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: DIMENSION SHEET, SECTION THROUGH CROWN, SHEET 6, APRIL, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  14. 65. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    65. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: UPSTREAM ELEVATION, SHEET 3; APRIL, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  15. 67. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    67. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: OUTLET GATES, CROWN SECTION, UPSTREAM ELEVATION AND DOWNSTREAM ELEVATION SHEET, SHEET 7; APRIL, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  16. PALMDALE WATER COMPANY, LITTLE ROCK DAM: REINFORCEMENT, SECTION THROUGH ARCH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    PALMDALE WATER COMPANY, LITTLE ROCK DAM: REINFORCEMENT, SECTION THROUGH ARCH RING, AMENDED SHEET 6; SEPTEMBER, 1922. Palmdale Water District files - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  17. 81. PALMDALE WATER COMPANY, LITTLE ROCK DAM: REINFORCEMENT, SECTION THROUGH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    81. PALMDALE WATER COMPANY, LITTLE ROCK DAM: REINFORCEMENT, SECTION THROUGH ARCH RING, AMENDED SHEET 6; SEPTEMBER, 1922. Palmdale Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  18. 64. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    64. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: PLAN VIEW, SHEET 2; APRIL, 1918. Palmdale Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  19. 1. CONTEXTUAL VIEW OF LITTLE FALLS DAM POWERPLANT AND NORTHWEST ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. CONTEXTUAL VIEW OF LITTLE FALLS DAM POWERPLANT AND NORTHWEST END OF LITTLE FALLS TIE LINE. LOOKING WEST - Little Falls Tie Line Towers, Near Little Dam Falls on Spokane River, Wellpinit, Stevens County, WA

  20. 80. LITTLE ROCK DAM: DIMENSIONS, SECTION THROUGH ARCH RING, AMENDED ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    80. LITTLE ROCK DAM: DIMENSIONS, SECTION THROUGH ARCH RING, AMENDED SHEET 5; SEPTEMBER, 1922. Palmdale Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

  1. 26. Original hydroelectric unit at Mormon Flat Dam. Unit is ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    26. Original hydroelectric unit at Mormon Flat Dam. Unit is still in operation. Photographer Mark Durben, 1988. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

  2. 1. Distant view of lock and dam to northeast ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Distant view of lock and dam to northeast - Mississippi River 9-Foot Channel, Lock & Dam No. 1, In Mississippi River at Mississippi Boulevard, below Ford Parkway Bridge, Saint Paul, Ramsey County, MN

  3. 2. Distant view of lock and dam to northwest ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Distant view of lock and dam to northwest - Mississippi River 9-Foot Channel, Lock & Dam No. 1, In Mississippi River at Mississippi Boulevard, below Ford Parkway Bridge, Saint Paul, Ramsey County, MN

  4. 4. View of dam front and sluiceway outlets Mississippi ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. View of dam front and sluiceway outlets - Mississippi River 9-Foot Channel, Lock & Dam No. 1, In Mississippi River at Mississippi Boulevard, below Ford Parkway Bridge, Saint Paul, Ramsey County, MN

  5. 4. Aerial view of Whitsett intake (lower right), Parker Dam ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Aerial view of Whitsett intake (lower right), Parker Dam and village (left), Gene Wash Reservoir, Gene Pump Plant and village (right). - Parker Dam, Spanning Colorado River between AZ & CA, Parker, La Paz County, AZ

  6. 1. East side of lower dam shown with water level ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. East side of lower dam shown with water level dropped. VIEW WEST - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

  7. 3. Side view of upper dam overspill, taken from east ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Side view of upper dam overspill, taken from east bank of Millstone Creek. VIEW WEST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

  8. 4. Side of view of upper dam overspill, taken from ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Side of view of upper dam overspill, taken from west bank of Millstone Creek, VIEW EAST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

  9. 5. View of upper dam side sluice taken from east ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. View of upper dam side sluice taken from east bank of Millstone Creek. VIEW WEST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

  10. 2. EASTSIDE RESERVOIR UNDER CONSTRUCTION LOOKING WEST WITH EAST DAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. EASTSIDE RESERVOIR UNDER CONSTRUCTION LOOKING WEST WITH EAST DAM IN MIDDLE GROUND, WEST DAM IN DISTANCE. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

  11. A dam in the middle of a river

    NSDL National Science Digital Library

    Katie Hale (California State University, Fullerton; Student, Biological Sciences)

    2007-01-12

    Dams have negative impacts on the plants and animals that have adapted to the specific movement of natural rivers and streams. Dams also cause temperature changes, erosion, and movement of sediment that are deadly to many organisms.

  12. 1. OVERALL VIEW OF UPSTREAM FACE OF DAM; SPILLWAY IN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. OVERALL VIEW OF UPSTREAM FACE OF DAM; SPILLWAY IN FOREGROUND, LOCK IN BACKGROUND ON NORTH RIVER BANK. VIEW TO NORTH. - Starved Rock Locks & Dam, Illinois Waterway River mile 231, Peru, La Salle County, IL

  13. DETAIL VIEW OF TOP OF DAM GATE STRUCTURE. UPSTREAM LOCK ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    DETAIL VIEW OF TOP OF DAM GATE STRUCTURE. UPSTREAM LOCK GATE AT RIGHT REAR. LOOKING WEST. - Illinois Waterway, La Grange Lock and Dam, 3/4 mile south of Country 795N at Illinois River, Versailles, Brown County, IL

  14. 12. DETAIL VIEW OF STEPPED CONCRETE GRAVITY DAM FACE AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. DETAIL VIEW OF STEPPED CONCRETE GRAVITY DAM FACE AND ROCK OUTCROPPING, WITH LAKE IN BACKGROUND, SHOWN AT MINIMUM WATER FLOW, LOOKING SOUTHEAST (UPSTREAM) - Van Arsdale Dam, South Fork of Eel River, Ukiah, Mendocino County, CA

  15. 11. VIEW OF HOCK OUTCROPPING, CONCRETE GRAVITY DAM FACE AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. VIEW OF HOCK OUTCROPPING, CONCRETE GRAVITY DAM FACE AND LAKE WITH TUNNEL INLET STRUCTURE IN DISTANCE, SHOWN AT MINIMUM WATER FLOW, LOOKING SOUTHEAST (UPSTREAM) - Van Arsdale Dam, South Fork of Eel River, Ukiah, Mendocino County, CA

  16. 34. DOWNSTREAM VIEW OF COOLIDGE DAM COMPLETED. POWER HOUSE, INTAKE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    34. DOWNSTREAM VIEW OF COOLIDGE DAM COMPLETED. POWER HOUSE, INTAKE TOWERS, WEST SPILLWAY CHANNEL AND DECORATIVE EAGLES ALL CLEARLY VISIBLE, c. 1928 - Coolidge Dam, Gila River, Peridot, Gila County, AZ

  17. 1. SNAKE RIVER VALLEY IRRIGATION DISTRICT DAM, VIEW OF NORTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. SNAKE RIVER VALLEY IRRIGATION DISTRICT DAM, VIEW OF NORTH ELEVATION OF INTAKE ON EAST SIDE OF DAM - Snake River Valley Irrigation District, East Side of Snake River (River Mile 796), Shelley, Bingham County, ID

  18. 20. HORSESHOE DAM LOOKING EAST WITH UPPER END DEMOLISHED FOR ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    20. HORSESHOE DAM LOOKING EAST WITH UPPER END DEMOLISHED FOR NEW SPILLWAY (negative reversed) - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

  19. 7. ISLAND PLANT AND HORSESHOE DAM FROM WEST BANK (negative ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. ISLAND PLANT AND HORSESHOE DAM FROM WEST BANK (negative reversed) - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

  20. 29. VIEW NORTHWEST ON SHELTON SIDE OF DAM DURING DEWATERING. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    29. VIEW NORTHWEST ON SHELTON SIDE OF DAM DURING DEWATERING. SHELTON GATEHOUSE IN LEFT CENTER. - Ousatonic Water Power Company, Dam & Canals, CT Routes 34 & 108, 1 mile North of Derby-Shelton Bridge, Derby, New Haven County, CT

  1. JiTT - Dam Removal - A Good Idea or Not?

    NSDL National Science Digital Library

    Laura Guertin

    1) What are some of the biological effects of dam removal (good and bad)? 2) What are some of the more pressing/compelling reasons to remove a dam? Explain. 3) The Stanley and Doyle (2003) article states that, ...

  2. 7. CLOSEUP VIEW OF WASHED UP 12' x 12' DAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. CLOSE-UP VIEW OF WASHED UP 12' x 12' DAM SUPPORT TIMBERS, THREE BEARS LAKE, LOOKING NORTHEAST FROM SOUTH SIDE OF LAKE - Three Bears Lake & Dams, North of Marias Pass, East Glacier Park, Glacier County, MT

  3. 2. Salmon Creek Diversion Dam, overview, diversion weir center foreground, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Salmon Creek Diversion Dam, overview, diversion weir center foreground, headworks overflow weir to center left, view to east - Salmon Creek Diversion Dam, Salmon Creek, Okanogan, Okanogan County, WA

  4. 1. Salmon Creek Diversion Dam, weir (to left), sand and ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Salmon Creek Diversion Dam, weir (to left), sand and silt sluice gate (center), main canal headworks (to right), view to northwest - Salmon Creek Diversion Dam, Salmon Creek, Okanogan, Okanogan County, WA

  5. View of upstream face of Lake Sabrina Dam showing redwood ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of upstream face of Lake Sabrina Dam showing redwood planks and boulders in Lake Sabrina Basin, view north - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

  6. View of Lake Sabrina Dam showing the wooden planks along ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of Lake Sabrina Dam showing the wooden planks along the upstream side face and the spillway at the right center of photo, view north - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

  7. 73. GENERAL ASSEMBLY OF MECHANISM, FOR OPERATING DIVERSION DAM SLUICE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    73. GENERAL ASSEMBLY OF MECHANISM, FOR OPERATING DIVERSION DAM SLUICE GATES Courtesy of U.S.R.S., Salt River Project - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

  8. 23. INTAKE DIVERSION DAM UNDER CONSTRUCTION, FACING NORTHWEST AND DOWNSTREAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    23. INTAKE DIVERSION DAM UNDER CONSTRUCTION, FACING NORTHWEST AND DOWNSTREAM Photographer: Walter J. Lubken, September 17, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

  9. 21. THE WHITNEY CONSTRUCTION CAMP AT THE DIVERSION DAM, FACING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    21. THE WHITNEY CONSTRUCTION CAMP AT THE DIVERSION DAM, FACING SOUTH. WOOD BURNING PLANT AT RIGHT, INTAKE GATES AT CENTER LEFT. Photographer: Walter J. Lubken, June 13, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

  10. 72. ARRANGEMENT OF SLUICE GATES AND HOISTS, DIVERSION DAM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    72. ARRANGEMENT OF SLUICE GATES AND HOISTS, DIVERSION DAM - POWER CANAL Courtesy of U.S.G.S., Reclamation Service, Salt River Project - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

  11. 1. TEMPORARY POWER HOUSE AT ROOSEVELT DAM. TRAMWAY LINES CAN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. TEMPORARY POWER HOUSE AT ROOSEVELT DAM. TRAMWAY LINES CAN BE SEEN AT TOP OF PHOTOGRAPH Photographer: Walter J. Lubken, May 10, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

  12. 78. POWER CANAL DIVERSION DAM, EXISTING STRUCTURE Courtesy of Dept. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    78. POWER CANAL DIVERSION DAM, EXISTING STRUCTURE Courtesy of Dept. of the Interior, Bureau of Reclamation, Salt River Project - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

  13. 58. AERIAL VIEW OF UPSTREAM FACE OF OWYEE DAM. VIEW ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    58. AERIAL VIEW OF UPSTREAM FACE OF OWYEE DAM. VIEW TO NORTHWEST. Photocopy of photograph by Glade Walker, U.S. Bureau of Reclamation, Pacific Northwest Region, September 22, 1977. - Owyhee Dam, Across Owyhee River, Nyssa, Malheur County, OR

  14. 32. AERIAL VIEW OF BOISE DIVERSION DAM. VIEW TO NORTH. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    32. AERIAL VIEW OF BOISE DIVERSION DAM. VIEW TO NORTH. Photocopy of photograph by Glade Walker, U.S. Bureau of Reclamation, Pacific Northwest Region, May 1981. - Boise Project, Boise River Diversion Dam, Across Boise River, Boise, Ada County, ID

  15. 59. AERIAL VIEW OF OWYHEE DAM SHOWING RINGGATE SPILLWAY. VIEW ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    59. AERIAL VIEW OF OWYHEE DAM SHOWING RING-GATE SPILLWAY. VIEW TO NORTHEAST. Aerial photo by Glade Walker, U.S. Bureau of Reclamation, Pacific Northwest Region, September 29, 1989. - Owyhee Dam, Across Owyhee River, Nyssa, Malheur County, OR

  16. 6. DETAIL VIEW OF OUTLET WORKS AT DAM 332, SHOWING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. DETAIL VIEW OF OUTLET WORKS AT DAM 332, SHOWING CONNECTION OF RADIAL GATE TO PIER, LOOKING NORTHEAST - J. Clark Salyer National Wildlife Refuge, Dam 332, Along Lower Souris River, Kramer, Bottineau County, ND

  17. 3. Down river view of lock and dam to southwest ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Down river view of lock and dam to southwest - Mississippi River 9-Foot Channel, Lock & Dam No. 1, In Mississippi River at Mississippi Boulevard, below Ford Parkway Bridge, Saint Paul, Ramsey County, MN

  18. 3. POOL, DAM, AND INTAKE TO PIPELINE LEADING TO FISH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. POOL, DAM, AND INTAKE TO PIPELINE LEADING TO FISH WHEEL, LOOKING WEST-NORTHWEST. - Santa Ana River Hydroelectric System, Bear Creek Diversion Dam & Confluence Pool, Redlands, San Bernardino County, CA

  19. View of Read Sawmill masonry dam, site of submerged sawmill ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of Read Sawmill masonry dam, site of submerged sawmill remains and earthen dam, facing north - Silas C. Read Sawmill, Outlet of Maxwell Lake near North Range Road, Fort Gordon, Richmond County, GA

  20. GENERAL AERIAL VIEW OF LAKE ALDWELL AND ELWHA DAM AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL AERIAL VIEW OF LAKE ALDWELL AND ELWHA DAM AND POWERHOUSE, WITH STRAIT OF JUAN DE FUCA TO THE NORTH. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

  1. MFR PAPER 1222 Effects of Dams on Pacific Salmon

    E-print Network

    . Their numbers were few and their total effect was relatively minor. In the 1880's dams for hydroelectric power. In the 1930's major hydroelectric dams were built on the mainstem Columbia River (Fig. I), initiating

  2. GENERAL AERIAL VIEW TO SOUTH OF ELWHA DAM AND POWERHOUSE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL AERIAL VIEW TO SOUTH OF ELWHA DAM AND POWERHOUSE WITH NORTH END OF RESERVOIR. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

  3. 33. AERIAL VIEW OF TIETON STORAGE DAM AND RIMROCK LAKE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    33. AERIAL VIEW OF TIETON STORAGE DAM AND RIMROCK LAKE (View of downstream face, spillway at center of photo, outlet works in operation.) - Tieton Dam, South & East of State Highway 12, Naches, Yakima County, WA

  4. "No. 190. Grand Valley Diversion Dam. Diversion gates, water flowing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    "No. 190. Grand Valley Diversion Dam. Diversion gates, water flowing into high line. June, 1917. R.B.D." - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

  5. 8. Early stage of power house construction at Dam No. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. Early stage of power house construction at Dam No. 4, showing two stiff leg derricks used to excavate limestone for power house building. Photo c. 1907. Credit PEM. - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

  6. 9. VIEW OF SPILLWAY AT DAM 83, SHOWING LOCATION OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. VIEW OF SPILLWAY AT DAM 83, SHOWING LOCATION OF FORMER CONCRETE FLASHBOARD STRUCTURE ON RIGHT, LOOKING WEST - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

  7. 10. DETAIL VIEW OF SPILLWAY AT DAM 83, SHOWING RIVER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. DETAIL VIEW OF SPILLWAY AT DAM 83, SHOWING RIVER COBBLE PAVING (FOREGROUND) AND WINGWALL, LOOKING EAST - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

  8. 1. VIEW OF DAM 83, LOOKING SOUTHWEST FROM THE LOOKOUT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. VIEW OF DAM 83, LOOKING SOUTHWEST FROM THE LOOKOUT TOWER AT THE REFUGE HEADQUARTERS (see HAER No. ND-3-A-13 for comparison) - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

  9. 318 IEEE TRANSACTIONS ON DEVICE AND MATERIALS RELIABILITY, VOL. 14, NO. 1, MARCH 2014 Thermomechanical Failure Analysis of

    E-print Network

    Huang, Rui

    Thermomechanical Failure Analysis of Through-Silicon Via Interface Using a Shear-Lag Model With Cohesive Zone Suk for dam- age initiation and fracture initiation, respectively. It is found that via extrusion]­[17] as shown in Fig. 1. The via extrusion can cause interfacial failure of a TSV and/or cracking in Si near

  10. Lac Courte Oreilles Hydro Dam Assessment

    SciTech Connect

    Weaver, Jason [Lac Courte Oreilles; Meyers, Amy [Kiser Hydro

    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.

  11. Hydroelectric dams need billions for rehab

    SciTech Connect

    Carr, F.H.; Soast, A.

    1993-01-11

    Many of the Corps of Engineers older hydroelectric dams will require major rehabilitation over the next ten years. Preventive maintenance, repair work, and major rehabilitation of the Corp's hydro dams in inadequate because the revenue generated by sales of electricity, by law, is returned to the Treasury. Most multimillion dollar rehabilitation projects require specific approval for funding by Congress and securing it is a long and difficult process. It is hoped the funding problem will soon be addressed by the Clinton administration. Already, nearly one-sixth of the 2,154 Mw of hydro is unavailable because with hydro units are either out of service or operating at less than full capacity.

  12. SUBAQUEOUS DISPOSAL OF MILL TAILINGS

    SciTech Connect

    Neeraj K. Mendiratta; Roe-Hoan Yoon; Paul Richardson

    1999-09-03

    A study of mill tailings and sulfide minerals was carried out in order to understand their behavior under subaqueous conditions. A series of electrochemical experiments, namely, cyclic voltammetry, electrochemical impedance spectroscopy and galvanic coupling tests were carried out in artificial seawater and in pH 6.8 buffer solutions with chloride and ferric salts. Two mill tailings samples, one from the Kensington Mine, Alaska, and the other from the Holden Mine, Washington, were studied along with pyrite, galena, chalcopyrite and copper-activated sphalerite. SEM analysis of mill tailings revealed absence of sulfide minerals from the Kensington Mine mill tailings, whereas the Holden Mine mill tailings contained approximately 8% pyrite and 1% sphalerite. In order to conduct electrochemical tests, carbon matrix composite (CMC) electrodes of mill tailings, pyrite and galena were prepared and their feasibility was established by conducting a series of cyclic voltammetry tests. The cyclic voltammetry experiments carried out in artificial seawater and pH 6.8 buffer with chloride salts showed that chloride ions play an important role in the redox processes of sulfide minerals. For pyrite and galena, peaks were observed for the formation of chloride complexes, whereas pitting behavior was observed for the CMC electrodes of the Kensington Mine mill tailings. The electrochemical impedance spectroscopy conducted in artificial seawater provided with the Nyquist plots of pyrite and galena. The Nyquist plots of pyrite and galena exhibited an inert range of potential indicating a slower rate of leaching of sulfide minerals in marine environments. The galvanic coupling experiments were carried out to study the oxidation of sulfide minerals in the absence of oxygen. It was shown that in the absence of oxygen, ferric (Fe3+) ions might oxidize the sulfide minerals, thereby releasing undesirable oxidation products in the marine environment. The source of Fe{sup 3{minus}} ions may be attributed to iron-bearing sulfide (and oxide) minerals present in the mill tailings. However, the concentration of available Fe{sup 3{minus}} ions can be reduced by the precipitation of insoluble ferric hydroxides (Fe(OH ){sub 3}) by seawater due to its near neutral pH. In such case, the oxidation of a sulfide mineral is inhibited due to the absence of an oxidizing agent (viz. oxygen and/or Fe{sup 3+} ions). The experiments carried out in this study provided a better understanding of behavior of sulfide minerals and mill tailings in subaqueous conditions and may be useful for further investigation of sulfide minerals and mill tailings in other environments.

  13. "No. 172. General view of the dam, looking downstream from ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    "No. 172. General view of the dam, looking downstream from the east end. F.E.D. June, 1916." Compare this historic image, taken upon dam completion (1916), with current-condition photograph HAER CO-90-1. The dam retains a remarkable degree of integrity of design and setting - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

  14. 2. View of the southern twothirds of the dam showing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. View of the southern two-thirds of the dam showing the Glens Falls Bridge over the Hudson River on the left, the Niagara Mohawk Power Corporation penstocks and inktake structure at the southeast corner of the dam, and the dam itself. The Finch Pruyn & Company Forebay is the foreground. Facing south. - Glens Falls Dam, 100' to 450' West of U.S. Route 9 Bridge Spanning Hudson River, Glens Falls, Warren County, NY

  15. Seismic performance analysis of Tendaho earth fill dam, Ethiopia.

    NASA Astrophysics Data System (ADS)

    Berhe, T.; Wu, W.

    2009-04-01

    The Tendaho dam is found in the Afar regional state, North Eastern part of Ethiopia. It is located within an area known as the ‘Tendaho Graben' ,which forms the center of Afar triangle, a low lying area of land where East African, Red sea and the Gulf of Eden Rift systems converge. The dam is an earthfill dam with a volume of about 4 Million cubic meters and with mixed clay core. The geological setting associated with the site of the dam, the geotechnical properties of the dam materials and seismicity of the region are reviewed. Based on this review, the foundation materials and dam body include some liquefiable granular soils. Moreover, the active East African Rift Valley fault, which can generate an earthquake of magnitude greater than 6, passes through the dam body. This valley is the primary seismic source contributing to the hazard at the Tendaho dam site. The availability of liquefiable materials beneath and within the dam body and the presence of the active fault crossing the dam site demand a thorough seismic analysis of the dam. The peak ground acceleration (PGA) is selected as a measure of ground motion severity. The PGA was selected according to the guidelines of the International Commission on Large Dams, ICOLD. Based on the criteria set by the ICOLD, the dam is analyzed for two different earthquake magnitudes, the Maximum Credible Earthquake (MCE) and the Operating Basis Earthquake (OBE). Numerical codes are useful tools to investigate the safety of dams in seismic prone areas. In this paper, FLAC3D numerical tool is used to investigate the performance of the dam under dynamic loading. Based on the numerical analysis, the seismic performance of the dam is investigated.

  16. 51. AVALON DAM Photographic copy of historic photo, c1889 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    51. AVALON DAM - Photographic copy of historic photo, c1889 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF EXCAVATION OF HEADGATE CHANNEL. ALSO SHOWS A PORTION OF DAM - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  17. 56. AVALON DAM Photographic copy of historic photo, December ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    56. AVALON DAM - Photographic copy of historic photo, December 18, 1905 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'REMAINING PORTIONS OF WASHED OUT TEMPORARY DAM' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  18. 50. AVALON DAM Photographic copy of historic photo, c1889 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    50. AVALON DAM - Photographic copy of historic photo, c1889 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'ROCK CUT AND DAM AT HEAD OF DITCH ABOVE EDDY, N.M.' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  19. 52. AVALON DAM Photographic copy of historic photo, c1890 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    52. AVALON DAM - Photographic copy of historic photo, c1890 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF SCOURWAY THROUGH AVALON DAM DISCHARGING WATER - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  20. 75. AVALON DAM Photographic copy of historic photo, April ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    75. AVALON DAM - Photographic copy of historic photo, April 10, 1938 (original print in '1938 Annual Report of the Carlsbad Project,' located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'AVALON DAM - CCC ROCK WORK AT SPILLWAY NO. 2' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  1. 61. AVALON DAM Photographic copy of historic photo, 1907 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    61. AVALON DAM - Photographic copy of historic photo, 1907 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF AVALON DAM RECONSTRUCTION - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  2. 3. View of the northern twothirds of the dam showing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. View of the northern two-thirds of the dam showing the Finch, Pruyn & Company intake structure and forebay canal on the right and the ice-covered log chute along the dam. Facing south-southwest. - Glens Falls Dam, 100' to 450' West of U.S. Route 9 Bridge Spanning Hudson River, Glens Falls, Warren County, NY

  3. 1. East apron upper dam with water flowing over overspill. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. East apron upper dam with water flowing over overspill. Photograph taken from crest of lower dam in foreground). VIEW WEST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

  4. 7. VIEW OF DOWNSTREAM FACE AND TOE OF DAM, WITH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. VIEW OF DOWNSTREAM FACE AND TOE OF DAM, WITH OUTLET PIPE AND CONCRETE COLLAR, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, Island Lake Dam, Ashley National Forest, 4.8 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

  5. 4. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, WITH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, WITH SPILLWAY IN FOREGROUND, LOOKING SOUTH - High Mountain Dams in Upalco Unit, Drift Lake Dam, Ashley National Forest, 11.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  6. RIVER VIEW FROM EXTERIOR LOCK WALL SHOWING DAM GATE, MANEUVER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    RIVER VIEW FROM EXTERIOR LOCK WALL SHOWING DAM GATE, MANEUVER BOAT No. 1, AND DAM. LOOKING NORTH NORTHEAST. - Illinois Waterway, La Grange Lock and Dam, 3/4 mile south of Country 795N at Illinois River, Versailles, Brown County, IL

  7. 1. VIEW OF DOWNSTREAM SIDE OF DIVERSION DAM ON THE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. VIEW OF DOWNSTREAM SIDE OF DIVERSION DAM ON THE SNAKE RIVER, LOOKING NORTHEAST. NOTE HEADGATE STRUCTURE ON NORTH BANK, SPILLWAY ON LEFT SIDE OF DAM, AND SPLASH LOGS ON DOWNSTREAM SIDE OF DAM. - Snake River Ditch, Headgate on north bank of Snake River, Dillon, Summit County, CO

  8. 25 CFR 173.16 - Reserved area, Coolidge Dam.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

  9. THREE GORGES DAM Matthew Morioka, Alireza Abrishamkar, Yve Kay

    E-print Network

    Prevedouros, Panos D.

    THREE GORGES DAM Matthew Morioka, Alireza Abrishamkar, Yve Kay CEE 491 #12;Specifications.3 Billion · Total Cost (2008) ¥ 148.4 Billion = $ 21.8 Billion #12;Source of Funds · Three Gorges Dam Construction Fund · Profits from the Gezhouba Dam · Policy Loans from the Chinese Development Bank · Loans from

  10. 25 CFR 173.16 - Reserved area, Coolidge Dam.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

  11. INCORPORATING UNCERTAINTY INTO DAM SAFETY RISK Sanjay S. Chauhan1

    E-print Network

    Chauhan, Sanjay S.

    INCORPORATING UNCERTAINTY INTO DAM SAFETY RISK ASSESSMENT Sanjay S. Chauhan1 and David S. Bowles2 ABSTRACT Risk assessment is becoming more widely used to supplement traditional approaches to dam safety decision-making. Dam owners throughout Australia, the U.S. Army Corps of Engineers, and the U.S. Bureau

  12. 25 CFR 173.16 - Reserved area, Coolidge Dam.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

  13. FLOOD WARNING SYSTEM BRISBANE RIVER BELOW WIVENHOE DAM

    E-print Network

    Greenslade, Diana

    FLOOD WARNING SYSTEM for the BRISBANE RIVER BELOW WIVENHOE DAM TO BRISBANE CITY This brochure for the Brisbane River below Wivenhoe Dam to Brisbane City. It includes reference information which will be useful kilometres of which about half is below Wivenhoe Dam. The Lockyer-Laidley Valley drains into the Brisbane

  14. 25 CFR 173.16 - Reserved area, Coolidge Dam.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2011-04-01 true Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

  15. 43 CFR 418.18 - Diversions at Derby Dam.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2011-10-01 true Diversions at Derby Dam. 418.18 Section 418.18 Public Lands...Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam must be managed to maintain minimum...

  16. 43 CFR 418.18 - Diversions at Derby Dam.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public Lands...Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam must be managed to maintain minimum...

  17. 77 FR 50493 - Sam Rayburn Dam Project Power Rate

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-21

    ...Southwestern Power Administration Sam Rayburn Dam Project Power Rate AGENCY: Southwestern...SUMMARY: The current Sam Rayburn Dam Project rate was approved by the Federal...with the Sam Rayburn and Robert D. Willis Dams, two Corps projects that are isolated...

  18. FLOOD WARNING SYSTEM BRISBANE RIVER ABOVE WIVENHOE DAM

    E-print Network

    Greenslade, Diana

    FLOOD WARNING SYSTEM for the BRISBANE RIVER ABOVE WIVENHOE DAM This brochure describes the flood above Wivenhoe Dam. It includes reference information which will be useful for understanding Flood above Wivenhoe Dam drains an area of approximately 7,000 square kilometres. The Brisbane River rises

  19. 43 CFR 418.18 - Diversions at Derby Dam.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public Lands...Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam must be managed to maintain minimum...

  20. 9. Analysis a. Analysis tools for dam removal

    E-print Network

    Tullos, Desiree

    9. Analysis a. Analysis tools for dam removal v. Hydrodynamic, sediment transport and physical are frequently the main concerns associated with a dam removal due to the possible effects on infrastructure reservoir sediment when removing a dam are river erosion, mechanical removal, and stabilization (ASCE 1997

  1. Geologic Hazards Associated With a Proposed Dam on the Yarlung-

    E-print Network

    Kidd, William S. F.

    Geologic Hazards Associated With a Proposed Dam on the Yarlung- Tsangpo River in SE Tibet Peter K-Gyala antiform. Active faults drawn in black. Approximate location of the dam and diversion tunnel proposed of data relevant to dam siting. Figure 8. Fission-track data from detrital zircons obtained from sands

  2. 75 FR 50777 - Minidoka Dam Spillway Replacement, Minidoka County, ID

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-17

    ...Reclamation [INT-FES 10-43] Minidoka Dam Spillway Replacement, Minidoka County...prepared a FEIS on the proposed Minidoka Dam Spillway Replacement. The U.S. Fish...be submitted electronically to minidoka_dam_eis@usbr.gov. FOR FURTHER...

  3. 43 CFR 418.18 - Diversions at Derby Dam.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public Lands...Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam must be managed to maintain minimum...

  4. 25 CFR 173.16 - Reserved area, Coolidge Dam.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

  5. Three gorges : the biggest dam in the world

    NSDL National Science Digital Library

    Jeffrey Leaf

    2006-01-01

    Students will understand the following:The enormous Three Gorges Dam is now being constructed in China on the upper Yangtze River.The dam will benefit many people, but it may also cause serious problems.Dams are built according to complex principles of engineering.

  6. GEOSYNTHETIC DAM LINING SYSTEMS By: Christine T. Weber1

    E-print Network

    Zornberg, Jorge G.

    GEOSYNTHETIC DAM LINING SYSTEMS By: Christine T. Weber1 and Jorge Zornberg, Advisor Abstract: The overall goal of this project is to contribute towards the use of geosynthetics in the design of dams geomembrane and composite liners under conditions representative of dams. There has been previous work done

  7. 75 FR 34476 - Glen Canyon Dam Adaptive Management Work Group

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-17

    ...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...renewing the charter for the Glen Canyon Dam Adaptive Management Work Group. The purpose...respect to the operation of Glen Canyon Dam and the exercise of other authorities...

  8. Dams and Water Developments1 Robert H. Schueneman

    E-print Network

    Standiford, Richard B.

    Dams and Water Developments1 Robert H. Schueneman 2/ 1/ Presented at the National Conference dams and reservoirs, channelization and erosion control on rivers and tributaries, and coastal works. Such activities include dams and asso- ciated reservoirs, flood and erosion control on tributaries and rivers

  9. Financial Analysis of Experimental Releases Conducted at Glen Canyon Dam

    E-print Network

    Kemner, Ken

    Financial Analysis of Experimental Releases Conducted at Glen Canyon Dam during Water Years 2006 Canyon Dam during Water Years 2006 through 2010 ANL/DIS-11-4 by L.A. Poch,1 T.D. Veselka,1 C.S. Palmer,2 Canyon Dam (GCD) conducted for the U.S. Department of Energy's Western Area Power Administration (Western

  10. Dam-Breach Flood Wave Propagation Using Dimensionless Parameters

    E-print Network

    Ponce, V. Miguel

    Dam-Breach Flood Wave Propagation Using Dimensionless Parameters Victor M. Ponce, M.ASCE1 ; Ahmad to study the sensitivity of dam-breach flood waves to breach-outflow hydrograph volume, peak discharge the channel. A dam-breach Froude number is defined to enable analysis through a wide range of site and flow

  11. Wavelet-Based Multiresolution Analysis of Wivenhoe Dam Water Temperatures

    E-print Network

    Percival, Don

    Wavelet-Based Multiresolution Analysis of Wivenhoe Dam Water Temperatures Don Percival Applied monitoring program recently upgraded with perma- nent installation of vertical profilers at Lake Wivenhoe dam in a subtropical dam as a function of time and depth · will concentrate on a 600+ day segment of temperature fluc

  12. 43 CFR 418.18 - Diversions at Derby Dam.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public Lands...Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam must be managed to maintain minimum...

  13. 2. UPSTREAM SIDE OF DAM AND BRIDGE WITH ABANDONED SAN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. UPSTREAM SIDE OF DAM AND BRIDGE WITH ABANDONED SAN TAN FLOOD-WATER HEADGATE IN FOREGROUND. TAKEN FROM NORTH END OF DAM - San Carlos Irrigation Project, Sacaton Dam & Bridge, Gila River, T4S R6E S12/13, Coolidge, Pinal County, AZ

  14. 6. VIEW SHOWING CREST OF DAM AND OUTLET GATE WHEEL, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW SHOWING CREST OF DAM AND OUTLET GATE WHEEL, STEM AND STEM GUIDE, LOOKING SOUTHEAST - High Mountain Dams in Upalco Unit, Milk Lake Dam, Ashley National Forest, 9.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

  15. LOCK, DOG HOUSE, CONTROL STATION, DAM GATE, MANEUVER BOAT No. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    LOCK, DOG HOUSE, CONTROL STATION, DAM GATE, MANEUVER BOAT No. 1, AND DAM. NOTE LOWER LOCK GATE IN FOREGROUND. LOOKING NORTH NORTHEAST. - Illinois Waterway, La Grange Lock and Dam, 3/4 mile south of Country 795N at Illinois River, Versailles, Brown County, IL

  16. 20. VIEW FROM DOWNSTREAM SIDE OF DAM SHOWING BUTTS OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    20. VIEW FROM DOWNSTREAM SIDE OF DAM SHOWING BUTTS OF LOGS PROJECTING BETWEEN CROSS LOGS. FREQUENTLY WHOLE TREES WERE USED IN CONSTRUCTING THESE DAMS. THE BRANCHES WERE PLACED UPSTREAM AND COVERED WITH EARTH AND STONE TO ANCHOR THEM. Photographed November 6, 1935. - Forge Creek Dam-John Cable Mill, Townsend, Blount County, TN

  17. 22. THE DIVERSION DAM UNDER CONSTRUCTION AT THE INTAKE OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. THE DIVERSION DAM UNDER CONSTRUCTION AT THE INTAKE OF THE SALT RIVER POWER CANAL, SHOWING COMPLETED APRON OF DAM IN MAIN CHANNEL OF RIVER BED. Photographer: Walter J. Lubken, October 17, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

  18. USACE EXPERIENCE WITH SEISMIC REMEDIATION OF EARTH AND CONCRETE DAMS

    Microsoft Academic Search

    MICHAEL K. SHARP; ENRIQUE E. MATHEU

    2005-01-01

    The US Army Corps of Engineers (USACE) has a long history related to research and evaluation of dams subjected to seismic loading. The USACE has responsibility for the safe performance of over two hundred dams in high seismic hazard areas of the US. In 1997, the USACE instituted the Dam Safety Assurance Program to provide for the modification of completed

  19. 29. At Willard, Little Salmon Creek. Site of former dam ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    29. At Willard, Little Salmon Creek. Site of former dam and water supply pond for Broughton flume. View from downstream of intake, dam wind wall to right, lower wall of overflow chute in left foreground (contains pipes and small dam, possibly for water pumping). West 320 degrees. - Broughton Flume, Hood River Junction on Columbia River at Washington/Oregon border, Hood, Skamania County, WA

  20. 77. AVALON DAM Photographic copy of map dated 1895 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    77. AVALON DAM - Photographic copy of map dated 1895 (from Record Group 49, Division F, National Archives, Washington, D.C.) PLAT OF RESERVOIR NO. 2 BEING THE DISTRIBUTING RESERVOIR OF THE PECOS IRRIGATION AND IMPROVEMENT CO'S SOUTHERN CANAL SYSTEM INCLUDES PLAN AND CROSS SECTION OF DAM - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  1. 78. AVALON DAM Photographic copy of construction drawing dated ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    78. AVALON DAM - Photographic copy of construction drawing dated August 1906 (from Record Group 115, Box 17, Denver Branch of the National Archives, Denver) AVALON DAM - PLAN AND TYPICAL CROSS SECTION - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

  2. 11. 'PROVO RIVER HEADQUARTERS, WASHINGTON LAKE DAM, PROVO RESERVOIR SYSTEM, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. 'PROVO RIVER HEADQUARTERS, WASHINGTON LAKE DAM, PROVO RESERVOIR SYSTEM, AUGUST 1913'. (5x7 print enlarged from 2 1/2 x 2 1/2' negative) - High Mountain Dams in Bonneville Unit, Washington Lake Dam, Kamas, Summit County, UT

  3. 74. AVALON DAM Photographic copy of historic photo, February ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    74. AVALON DAM - Photographic copy of historic photo, February 11, 1936 (original print filed in Record Group 115, National Archives, Washington, D.C.) Quinn, photographer 'LAKE AVALON, SHOWING DAM AND SPILLWAYS' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

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

    USGS Publications Warehouse

    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.

  5. 6. VIEW OF DAM 83, SHOWING OUTLET CHANNEL FLOWING INTO ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW OF DAM 83, SHOWING OUTLET CHANNEL FLOWING INTO POND A WITH DIVERSION GATES LONG EAST (LEFT) SIDE OF OUTLET CHANNEL, LOOKING SOUTH FROM DOWNSTREAM FACE OF THE DAM - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

  6. Prefabricated cutoff wall of an earth dam

    Microsoft Academic Search

    A. A. Ravkin; I. I. Shekhtman

    1993-01-01

    Conclusions 1.The prefabricated cutoff wall as one of the economically justified designs can be regarded as the main watertight element of an earth dam.2.The cutoff wall can be made from precast asphaltic concrete and concrete blocks and combined — from both joined together on asphalt mastic. An analysis of the stress-strain state showed that each of these walls has a

  7. Eye in the Sky: Floods and Dams

    NSDL National Science Digital Library

    This site provides general information about floods and dams. There are sections on the science, the phenomenon, and effects of floods. One video clip shows the Mississippi River at flood and non-flood levels. Another clip shows actual footage of a flood wreaking havoc on a populated area.

  8. Water flows during dam-power retrofit

    SciTech Connect

    Van Weele, B.; McClung, E.M.

    1984-09-01

    The design and construction efforts required for retrofitting a 6.9-MW hydro-turbine/generator within a small 20-year-old earth-filled irrigation dam includes all the engineering challenges of a much larger project, particularly when the water flow to the rice fields could not be interrupted, even during the digging of the 870-ft hydro tunnel.

  9. Dam water quality study. Report to Congress

    SciTech Connect

    Not Available

    1989-05-01

    The objective of the report is to identify water quality effects attributable to the impoundment of water by dams as required by Section 524 of the Water Quality Act of 1987. The document presents a study of water quality effects associated with impoundments in the U.S.A.

  10. Dams and Salmon: A Northwest Choice

    ERIC Educational Resources Information Center

    Tucker, Michael; Tromley, Cheryl L.

    2005-01-01

    This article describes an experiential exercise in which participants assume the roles of various stakeholder groups in the controversy surrounding possible dam removal to revive northwestern U. S. salmon populations. The role-play (a) increases environmental awareness in the context of the competing interests various stakeholders have in our…

  11. Will We. . .? Thai Dam Resource Book.

    ERIC Educational Resources Information Center

    Murphy, Richard, Ed.; And Others

    This resource book is intended as an aid to persons working with Thai Dam refugees. To help the language teacher, some differences between Lao and English are discussed, specifically tonal inflections, positioning, declension of pronouns, conjugation of verbs, interrogatives, classifiers and predicate adjectives. An outline of cultural differences…

  12. White Oak Dam stability analysis. Volume I

    SciTech Connect

    Ahmed, S.B.

    1994-01-01

    A parametric study was conducted to evaluate the stability of the White Oak Dam (WOD) embankment and foundation. Slope stability analyses were performed for the upper and lower bound soil properties at three sections of the dam using the PCSTABL4 computer program. Minimum safety factors were calculated for the applicable seismic and static loading conditions. Liquefaction potential of the dam embankment and foundation solid during the seismic event was assessed by using simplified procedures. The WOD is classified as a low hazard facility and the Evaluation Basis Earthquake (EBE) is defined as an earthquake with a magnitude of m{sub b} = 5.6 and a Peak Ground Accelerator (PGA) of 0.13 g. This event is approximately equivalent to a Modified Mercalli Intensity of VI-VIII. The EBE is used to perform the seismic evaluation for slope stability and liquefaction potential. Results of the stability analyses and the liquefaction assessment lead to the conclusion that the White Oak Dam is safe and stable for the static and the seismic events defined in this study. Ogden Environmental, at the request of MMES, has checked and verified the calculations for the critical loading conditions and performed a peer review of this report. Ogden has determined that the WOD is stable under the defined static and seismic loading conditions and the embankment materials are in general not susceptible to liquefaction.

  13. Percy Quin Dam LiDAR Scan

    USGS Multimedia Gallery

    A 3-D terrestrial LiDAR scan of the Percy Quin Mississippi State Park Dam in McComb, Mississippi, taken Monday, September 3, 2012. The U.S. Geological Survey is using this new technology in select areas of Louisiana, Mississippi and Alabama to map impacts by Hurricane Isaac....

  14. Radar proves its worth in dam rehabilitation

    SciTech Connect

    NONE

    1996-08-01

    This article outlines the use of radar techniques to survey the masonry structure of White Marble Dam. The survey used a subsurface interface radar, and this equipment displayed a cross-sectional profile of the entire structure, revealing the size and location of any faults. By avoiding the draining and dredging of the upstream pool, it is estimated that this technique saved three months.

  15. Fish reproductive guilds downstream of dams.

    PubMed

    Vasconcelos, L P; Alves, D C; Gomes, L C

    2014-11-01

    Fish reproductive guilds were used to evaluate the responses of species with different reproductive strategies during two different periods of post-dam construction. The data used for the comparisons were collected in the upper Paraná River floodplain (Brazil), downstream of the Porto Primavera dam, 2 and 10 years after impoundment. The abundance (catch per unit effort, CPUE), species richness, evenness and structure of communities, all within reproductive guilds, were used to test the hypothesis that these metrics vary spatially and temporally. The influence of damming on species structure and the diversity of fish reproductive guilds varied spatiotemporally, and species with opportunistic reproductive strategies tended to be less affected. Conversely, long-distance migratory species responded more markedly to spatiotemporal variations, indicating that the ecosystem dynamics exert greater effects on populations of these species. Thus, the effects of a dam, even if attenuated, may extend over several years, especially downstream. This finding emphasizes the importance of maintaining large undammed tributaries downstream of reservoirs. PMID:25230203

  16. Water flows during dam-power retrofit

    Microsoft Academic Search

    B. Van Weele; E. M. McClung

    1984-01-01

    The design and construction efforts required for retrofitting a 6.9-MW hydro-turbine\\/generator within a small 20-year-old earth-filled irrigation dam includes all the engineering challenges of a much larger project, particularly when the water flow to the rice fields could not be interrupted, even during the digging of the 870-ft hydro tunnel.

  17. Geomembrane application for an RCC dam

    Microsoft Academic Search

    Bob L. Whitfield

    1996-01-01

    This paper focuses on a fairly unique application of a geosynthetic material for a reservoir impoundment dam. Use of a geosynthetic material to enhance the ‘impervious’ nature of the design was not without its attendant difficulties during installation. As with any unique application by end users not familiar with a particular construction material's physical characteristics or installation requirements, problems arise

  18. Aging Dams and Watersheds: Rehabilitation and Restoration

    NSDL National Science Digital Library

    The US Department of Agriculture's Water Quality Information Center at the National Agricultural Library has placed a new database online. The bibliography on Aging Dams and Watersheds includes 33 citations (1984-1998) "intended primarily to provide awareness of recent investigations and discussions" of related topics; several citations are hyperlinked to the full-text articles.

  19. IMPACTS OF WHITE-TAILED DEER ON FOREST REGENERATION IN NORTHWEST ERN PENNSYLVANIA

    Microsoft Academic Search

    NANCY G. TILGHMAN

    Browsing by white-tailed deer (Odocoileus virginianus) is a major cause of regeneration failure in Allegheny hardwood forests of northwestern Pennsylvania. I examined the impact of deer at 5 different densities (0, 10, 20, 40, and 80 deer\\/259 ha) on tree seedlings, woody shrubs, and herbaceous plants in large enclosures over 5 years. I examined 3 silvicultural treatments (clearcut, thinning, and

  20. Gabcikovo dam and Liptovska Mara dam - statistical analysis of measurement data

    NASA Astrophysics Data System (ADS)

    Hakac, J.; Sabo, M.

    2012-04-01

    Introduction: Water level in the observation wells is measured regularly and one of the reasons is evaluation of the safety of the water constructions. In this paper we are exploring the reliability of the measuring devices that are responsible for evaluation of the safety of the two largest and the most important dams in Slovakia. We test ability of selected statistical methods to detect early inaccuracies of measuring devices and thus improve the evaluation of the safety of the water constructions. As a follow-up study, we used the time series model (Neural network) to predict water levels in the observation wells that were considered to be without defects. Neural Network is also able to show dynamics of the filtration stability of the observational well. Methods: On the Liptovska Mara dam weekly data was used as a monitoring tool. On the Gabcikovo dam five minute time series of the measurements of the water level in observation wells around the right lock chamber were used. Data from the measuring devices of the dams were explored with boxplots, correlations, neural network, etc. The mentioned statistical tools analyze time series and detect the errors that measuring devices make when generating data and can be used to predict errors even in real time. In the second step, agreement between predicted data from neural network and measured data in the real time was evaluated. We used grid search for finding the optimal number of neurons and then predicted errors by using this model. The ability of the neural network in evaluation of the sealing of the dilatation joints on the filtration stability in the years 2009 - 2011 is presented. Results: From the 18 selected measuring devices on the Liptovska Mara dam there are only 3 devices which can be considered as reliable. On the Gabcikovo dam, 8 of 9 measuring devices (observation wells around right lock chamber) were considered as a reliable. There was very good agreement between the predicted and measured data at the Liptovska Mara dam using the neural network model. At the Gabcikovo dam the dynamics of the filtration stability around the right lock chamber is presented. Conclusions: The significance of the neural network is the ability to predict the water level in the observation wells at a dam site and total filtration stability of the dams by using the real measures in the time series. This is a desirable step to ensure adequate safety with the possibility to solve potential defects earlier.