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Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> r <br /> EMERGENCY SPILLWAY <br /> CR£ST <br /> DESIGN HIGH WATER <br /> r <br /> r h <br /> owANTI -SEEP <br /> Al`i r-VORTEX COWERS <br /> DEVICE Df- <br /> YAr RISER BARREL <br /> r - <br /> Lr- <br /> CONORETE BASE E <br /> +w <br /> L <br /> r H = HEAO ON PIPE THROUGH EMBANKMENT <br /> h = HrZAD OVER RISER CREST <br /> L = LENGTH OF PIPE THROUGH EMBANKMENT <br /> r Dp = DIAMETER OF. PIPE THROUGH EMBANKMENT <br /> Dr = D1AWETER OF RISER <br /> r <br /> r <br /> r <br /> Plate 4 . 261 Principal Spillway Design <br /> r Source: Virginia DSWC <br /> r <br /> 4-93 <br />