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Showing 1 to 15 of 15 for “"Dam safety"”.
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An assessment of streamflow production mechanisms for dam safety applications in the Colorado Front Range
Hydrologic analyses are used for dam safety evaluations to determine the flow a dam must pass without failing. Many current guidelines model flood runoff solely by an infiltrationexcess mechanism. Saturation-excess runoff and subsurface stormflow mechanisms are known to be important for common …
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Finite element model updating of concrete arch dams affected by alkali-silica reaction using ambient vibration monitoring and dam surveillance data
Dams are important structures whose safety in operation is critical owing to the socioeconomic impacts associated with their collapse. Alkali-Silica Reaction (ASR) is a deleterious chemical reaction that affects the performance and safety of numerous concrete dam structures around the world. To …
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A framework for the evaluation of the structural safety of existing concrete gravity dams
Addressing the aging and deterioration of dams is a relatively new challenge in the dam engineering field in South Africa. The average life expectancy of a dam is approximately 50 years, but they can normally be used for much longer periods than this. Maintenance and rehabilitation are vital to …
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Enhancing Spillway Efficiency Discharge Coefficients: Insights from Historical Models and Case Studies of Ogee, Lateral, and Non-Linear Structures
… of spillway discharge capacity remains fundamental to dam safety and hydraulic design. Classical formulations such as those of USBR (1987), Ven Te Chow (1959), USACE (1990) and DWS Calibration Manual were developed under the idealised geometric and hydraulic assumptions. However, many South …
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Breaching of earth embankments and dams
… techniques, flood embankment and embankment dam failures occur almost routinely around the world. The need to understand, predict and prevent the breaching process remains a high priority for owners and flood risk managers alike. This research provides new understanding and improved methods …
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Risk Assessment of Post-Fire Floods on Dams and Their Floodplains
… infrastructures and residential zones. Earth dams are vulnerable to post-wildfire floods. The increased post-wildfire runoff volumes due to changes in soil characteristics and reduced vegetation could result in overtopping failure of an earth dam (dam-break scenario), and the accumulation of …
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Investigating the operational behaviour of a double curvature arch dam
The safety of dams is crucial in ensuring the continual availability of water, safety of the surrounding communities and infrastructure. Surveillance systems are implemented to monitor the structural integrity of certain dams which have a safety risk. The components and extent of the surveillance …
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Experimental Study of Nappe Oscillations on Free Overfall Structures
… including irrigation, water treatmentand dam safety. The gravity-driven free falling jet on the downstream side of these structures, called the nappe, may display a variety of behaviors and instabilities among which, under relatively low heads/discharges, nappe oscillations, also known as …
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Cost Trends and Estimates for Dam Rehabilitation in the Commonwealth of Virginia
… the United States has seen a high demand for dam rehabilitation projects as most dam infrastructure has started to reach or exceed the expected life span of 50-70 years. Rehabilitation projects can be very expensive, however, and the funding options for dam owners are limited. To raise …
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Applying the DER rating system for the visual assessment of defects on concrete dams
… the management and maintenance of Namibia's main dams, amongst the many other infrastructure assets under their ownership. They have, as a result, devised asset management policies and practices with the aim of reaping the benefits of asset management. Additionally, they have aligned themselves …
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A comparative study on the structural behavior of concrete arch dams subjected to swelling due to aggregate sllica reactions
… water resources. As time goes by, the ageing of dams in South Africa is becoming an increasingly important factor to consider from a dam safety perspective. When considering concrete dams, Alkali Aggregate Reactions (AAR) which is the collective term referring to the potential chemical reactions …
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Procedures to Perform Dam Rehabilitation Analysis in Aging Dams
There are hundreds of existing dams within the State of Virginia, and even thousands more specifically within the United States. A large portion of these dams do not meet the current safety standard of passing the Probable Maximum Flood. Likewise, many of the dams have reached or surpassed the …
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Seepage monitoring and diagnosis of distresses in an earth embankment dam using probability methods
Failure of embankment dams may result in catastrophic consequences. Considering seepage and internal erosion are accounted as one of the major causes of failure in earth embankment dams, it is essential to detect any concentrated seepage and sources of distress at early stages. A number of …
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Interactions of a Human Body with Parallel Angled Vanes Used to Improve Public Safety at a Low-Head Dam
The flow below low-head dams and weirs presents a significant public safety risk due to the formation of a submerged hydraulic jump that creates a dangerous recirculating flow or "roller”. Numerous safety incidents have been documented over the last several decades that have led to the development …