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• Sediment Pond E <br />COLLECTION DITCH CDE-1 <br />FLOW IN A TRIANGULAR CHANNEL <br />ENTER DEPTR D 0.650 FEET <br />ENTER SLOPE S 0.005 EXPRESS AS DECIMAL <br />ENTER "N" N 0.030 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 3.000 SLOPE = X:1 <br />AREA=(WxD)+(RxD"21= 1.27 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 4.11 FEET <br />R=AREA/WETTED PERMITER 0.31 <br />V=(1.49/N)x(R".667)x(5".5)= 1.60 FEET/SEC <br />Q = A X V = 2.03 CFS <br />Q REQUIRED 1.81 <br />Collection Ditch CDE-1 will be a triangular channel 0.65 <br />feet deep with 3h:ly side slopes. With a freeboard of 0.3' <br />the total depth of collection ditch CDE-1 is 0.950 feet. <br />• The flow velocity is slow enough that erosion will not be a <br />problem. <br />COLLECTION DITCH CDE-1 <br />ALTERNATE SIZE DESIGN <br />FLOW IN A TRIANGULAR CHANNEL <br />ENTER DEPTH D 0.650 FEET <br />ENTER SLOPE S 0.020 EXPRESS AS DECIMAL <br />ENTER "N" N 0.030 BXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 1.500 SLOPE = X:1 <br />AREA=(W#D)+(XxD"2)= 0.63 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2)1".5 2.34 FEET <br />R=AREA/WETTED PERMITBR 0.27 <br />V=(1.49/N)x(R".6671x15".5)= 2..94 FEET/SEC <br />Q = A X V = 1.86 CFS <br />Q REQUIRED 1.81 <br />Collection Ditch CDE-1 will be a triangular channel 0.65 <br />feet deep with 1.5h:1v side slopes. With a freeboard of 0.3' <br />the total depth of collection ditch CDE-1 is 0.950 feet. <br />The flow velocity is slow enough that erosion will not be a <br />• problem. <br />9-20 July 1991 <br />