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• <br />Sediment Pond E <br />RIPRAP SIZING - Spillway Channel Across Top of Embankment <br />D50 = Size of Riprap <br />D50 = ((V X S".17)/7.58))"2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 0.070 feet 0.836 inches <br />C , <br />J <br />DETERMINE VELOCITY OF FLOW DOWN 5:1 EMBANKMENT <br />ENTER DEPTH D 0.410 FEET <br />ENTER WIDTH W 6.000 FEET <br />ENTER SLOPE 5:1 S 0.200 EXPRESS AS DECIMAL <br />ENTER "N" N 0.040 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W#D)+(X#D"2)= 2.80 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 7.83 FEET <br />R=AREA/WETTED PERMITER 0.36 <br />V=(1.49/N)#(R".667)#(S".5)= 8.38 FT/SEC <br />Q = A X V = 23.44 CFS <br />Q REQUIRED 23.21 CFS <br />RIPRAP SIZING - Spillway Channel Down Face of Embankment <br />D50 = Size of Riprap <br />D50 = ((V X S".17)/7.58))"2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 0.708 feet 8.491 inches <br />The spillway for sediment pond E will be a trapezoidal <br />channel 6.0 feet wide and 0.80 feet deep <br />with a freeboard of 12" for a total depth of 1.800 <br />feet. Riprap, 6" minus, will be placed in the spillway <br />channel across the top of the embankment and riprap, <br />9" minus, will be placed in the spillway channel down <br />the face of the embankment and in the inlet channel <br />that feeds the pond. <br />• <br />9-19 <br />