Dams are subject to seepage through their foundations and abutments. Seepage may result in excess fluid pressures or uplift pressures beneath elements of the dam, thereby becoming a safety concern with respect to the stability of the dam. Pressure-relief wells are an integral part of a dam's seepage control system. These wells are generally designed to be free flowing and placed to intercept zones in dam foundation materials that are sensitive to elevated fluid pressures. Pressure-relief wells reduce excess fluid pressures by allowing water to be safely discharged from the zone affected by the excess fluid pressure (U.S. Army...

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