Flood Overtopping Failure of Dams

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Embankment Dam Overtopping – Failure Probability Factors • Depth and duration of overtopping • Camber or low spots on dam crest may concentrate overtopping flows • Flow may concentrate along groins or at toe • Downstream zoning/slope protection • Dam crest materials, paving • Wave set-up and run-up • Potential for failure of parapet walls • Discontinuities on crest or downstream face that could initiate erosion / headcutting 32
Concrete Dam Overtopping • Failure mode is generally more complicated • Erosion typically initiates in downstream portion of rock foundation; scour and headcutting undermine dam or allow foundation blocks to daylight; concrete structure is overstressed due to loss of foundation support; dam breaches due to sliding or overturning of dam sections 33
Page 1 and 2: Flood Overtopping Failure of Dams F
Page 3 and 4: Taum Sauk Dam 3 No spillway provide
Page 5 and 6: Delhi Dam Limited spillway capacity
Page 7 and 8: Dam Overtopping Failure Mode • Mo
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: Fragility Curves - Embankment Dam O
Page 35 and 36: Analysis Tools • WINDAM - Embankm
Page 37: Conclusions • Reclamation uses a

Flood Overtopping Failure of Dams

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