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<br />OIl FOR CONCRETE OR MASONRY DAMS <br /> <br />A simplified method for calculation of Qp for concrete and masonry dams was <br />developed by applying the weir equation in the standard form: <br /> <br />Q = CLh3/2 <br /> <br />Equation "I <br /> <br />where <br /> <br />C = Discharge coefficient <br /> <br />L = Length of the Weir <br /> <br />h = Depth of Plow OVer the Weir <br /> <br />The following assumptions are then made: <br /> <br />1. The dam fails abruptly. forming a rectangular breach. <br /> <br />2. The width of the breach is one third of the crest length. <br /> <br />3. The depth of the breach is three quarters of the dam height. less <br />freeboard. <br /> <br />using a discharge coefficient of 3.0. equation "I then becomes: <br /> <br />Qp = (3.0)(LC)(0."l5H - FB)3/2 = (LC) (0."l5H - PB)3/2 <br />3 <br /> <br />Equation 8 <br /> <br />The failure hydrograph is assumed to have the same shape as that of an earth <br />or rock fill dam. as shown in figure 1. <br /> <br />"I <br />