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• Sediment Pond C <br />DRAINAGE .AREA IACRES) <br />CURVE N0. <br />STORM EVENT Y'R., 24 HR. <br />STORM EVENT in. <br />RUNOFF in. <br />WATERSHED RELIEF ft. <br />Lc 25 ft. <br />Lc 50 ft. <br />Lc 75 ft. <br />WATERSHED SLOPE <br />SLOPE ADJUSTMENT FACTOR <br />LENGHT OF WATERSHED <br />EQUIVALENT DRAINAGE AREA <br />PEAK FLOW cfs/in Fig D-2 <br />POND C <br />SPILLWAY <br />• <br />• <br />ADJUSTED PEAK FLOW <br />PEAK FLOW CALCULATIONS <br />69.0 <br />80.00 <br />25 <br />2.0 <br />0.56 <br />140 <br />1500 <br />1850 <br />1550 <br />5.71 <br />1.12 MODERATE <br />4350 <br />157 <br />88 <br />24.3 <br />POND C EMERGENCY SPILLWAY <br />MANNING'S EQUATION <br />FLOW IN A TRAPEZOIDAL CHANNEL <br />ENTER DEPTH D 0.820 FEET <br />ENTER WIDTH W 6.000 FEET <br />ENTER SLOPE S 0.020 EXPRESS .4S DECIMAL <br />ENTER "N" N 0.040 EXPRESS .4S DECIMAL <br />ENTER SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W#DI+(X#D"2)= 6.26 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 9.67 FEET <br />R=AREA/WETTED PERMITER 0.65 <br />V=(1.49/N)*IR".667)#(S".5)= 3.94 FT/SEC <br />Q = A X V = 24.71 CFS <br />Q REQUIRED <br />24.29 CFS <br />9-11 <br />