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Florida Erosion and Sediment Control Inspector's Manual <br /> EMERGENCY SPILLWAY <br /> CREST <br /> DESIGN HIGH WATER <br /> h <br /> r- -7 <br /> ANTI-SEEP <br /> ANTI-VORTEXCOLLARS <br /> DEVICE Or N <br /> RISER <br /> BARREL <br /> IA DP <br /> r <br /> CONCRETE BASE <br /> L r <br /> H = HEAD ON PIPE THROUGH EMBANKMENT <br /> h = HEAD OVER RISER CREST <br /> L = LENGTH OF PIPE THROUGH EMBANKMENT <br /> DP = DIAMETER OF PIPE THROUGH EMBANKMENT <br /> Dr = DIAMETER OF RISER <br /> r <br /> Plate 4.261 Principal Spillway Design <br /> Source: Virginia DSWC <br /> 4-92 - <br />