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C <br />• <br />Sediment Pond E <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 cfs/in Fig D-2 <br />ADJUSTED PEAK FLOW <br />PEAK FLOW CALCULATIONS <br />POND E <br />SPILLWAY <br />62.2 <br />80.00 <br />25 <br />2.0 <br />0.56 <br />110 <br />950 <br />1350 <br />1600 <br />4.0 <br />1.00 MODERATE <br />3150 <br />92.0 <br />61 <br />COLLECT <br />DITCH <br />CDE-1 <br />23.2 <br />6.3 <br />80.00 <br />10 <br />1.6 <br />0.34 <br />60 <br />350 <br />450 <br />300 <br />6.0 <br />1.07 MODERATE <br />2250 <br />52.5 <br />42 <br />1.8 <br />POND E EMERGENCY SPILLWAY <br />MANNING'S EQUATION <br />FLOW IN A TRAPEZOIDAL CHANNEL <br />L J <br />ENTER DEPTH D 0.800 FEET <br />ENTER WIDTH W 6.000 FEET <br />ENTER SLOPE S 0.020 EXPRESS AS DECIMAL <br />ENTER "N" N 0.040 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(WtD)+(X#D"2)= <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 <br />R=AREA/WETTED PERMITER <br />V=(1.49/N)t(R".667)~(S".5)= <br />Q = A X V = <br />Q REQUIRED <br />6.08 FEET"2 <br />9.58 FEET <br />0.63 <br />3.89 FT/SEC <br />23.66 CFS <br />23.21 CFS <br />9-18 <br />