Hydrologic Safety of Earth Dams

by Anand Prakash, Dames & Moore, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Hydrologic and hydraulic analyses are presented pertaining to the safety evaluation of an earth dam located downstream of another smaller earth dam. The upper dam is assumed to breach due to overtopping during the probable maximum flood (PMF). The lower dam has a low-drop semi-circular spillway which gets submerged during high flows resulting in significant reduction in its discharging capacity. A smaller straight-crest spillway is found to be less severely affected by submergence and would have been a better option for this dam if PMF is the required hydrologic design basis.

Subject Headings: Hydrology | Dam safety | Earthfill dams | Dam failures | Submerged flow | Hydraulic design | Rivers and streams | Spillways

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