Flood Overtopping Failure of Dams

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Dam Overtopping Failure Mode • Failure of dams due to overtopping is a common failure mode, accounting for 30 percent of the failures in the U.S. over the last 75 years • Many older dams may have been designed for floods that no longer represent a remote flood event • Many dams can not pass the current Probable Maximum Flood without overtopping 6
Dam Overtopping Failure Mode • Most embankment dams would likely not withstand sustained overtopping of a foot or more without a high probability of failure • While most concrete dams can likely withstand a certain level of overtopping due to their rock foundations, some may be vulnerable due to the jointing and fracturing in the rock mass • Reclamation evaluates both embankment and concrete dams for the overtopping failure mode 7
Page 1 and 2: Flood Overtopping Failure of Dams F
Page 3 and 4: Taum Sauk Dam 3 No spillway provide
Page 5: Delhi Dam Limited spillway capacity
Page 9 and 10: Embankment Dam Overtopping Event Tr
Page 11 and 12: Embankment Dam Overtopping Failure
Page 13 and 14: Reclamation Process for Evaluating
Page 15 and 16: Initial Risk Screening Based on PMF
Page 17 and 18: Risk of Dam Overtopping Based on Pe
Page 19 and 20: Attenuation of Flood Peak 19
Page 21 and 22: Reservoir Water Surface El Range Ta
Page 23 and 24: Uncertainties with Flood Events •
Page 25 and 26: Uncertainties with Reservoir Operat
Page 27 and 28: Key Concepts • Operational failur
Page 29 and 30: Picture of Palagendra with Debris 2
Page 31 and 32: Fragility Curves - Embankment Dam O
Page 33 and 34: Concrete Dam Overtopping • Failur
Page 35 and 36: Analysis Tools • WINDAM - Embankm
Page 37: Conclusions • Reclamation uses a

Flood Overtopping Failure of Dams

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