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Risk evaluation for earth-fill dams due to heavy rains by response surface method
Published in Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, 2023
Shiying Zheng, Shin-ichi Nishimura, Takayuki Shuku, Toshifumi Shibata, Tsubasa Tateishi
If detailed information on the spillway of a dam can be obtained, it is thought that the storage effect will provide an accurate prediction of the probability of overflow failure. The storage effect is the additional storage relative to the full water level of the earth-fill dam, that is, the amount of water allowed from the full water level of the earth-fill dam to the critical full water level of the spillway. It can affect the peak overflow discharge during a continuous rainfall event and the probability of exceeding the runoff height of the earth-fill dam (MAFF 2015). The overflow probability, considering the storage effect, is defined as Eq. (22).
hd: designated overflow head on the spillway (m)