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• Sediment Pond B <br />DRAINAGE AREAS B & C <br />DRAINAGE AREA (ACRES) <br />CURVE NO. <br />STORM EVENT _YR., 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 efs/in Fig D-2 <br />ADJUSTED PEAK FLOW <br />• <br />PEAK FLOW CALCULATIONS <br />POND B <br />SPILLWAY <br />357.0 <br />80.00 <br />25 <br />2.0 <br />0.56 <br />260 <br />6250 <br />7500 <br />4750 <br />7.7 <br />0.79 STEEP <br />8750 <br />505 <br />300 <br />COLLECT <br />DITCH <br />CDB-1 <br />94.3 <br />9.37 <br />80.00 <br />10 <br />1.6 <br />0.34 <br />110 <br />800 <br />850 <br />900 <br />17.2 <br />1.01 STEEP <br />950 <br />12.5 <br />19.0 <br />4.8 <br />POND B EMERGENCY SPILLWAY <br />MANNING'S EQUATION <br />FLOW IN A TRAPEZOIDAL CHANNEL <br />ENTER DEPTH D 1.250 FEET <br />ENTER WIDTH W 12.000 FEET <br />ENTER SLOPE S 0.020 EXPRESS AS DECIhIAL <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)= 18.13 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2 +D"2))".5 17.59 FEET <br />R=AREA/WETTED PERMITER 1.03 <br />V=(1.49/N)*(R".667)*(S".5)= 5.37 FT/SEC <br />Q = A X V = 97.41 CFS <br />Q REQUIRED <br />• <br />94.28 CFS <br />9-7 <br />