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• Sediment Pond D <br />COLLECTION DITCH CDD-1 <br />FLOW IN A TRIANGULAR CHANNEL <br />ENTER DEPTH D 1.000 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=(W#D)+(X#D"2)= 3.00 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 6.32 FEET <br />R=AREA/WHTTBD PERMITER 0.47 <br />V=11.49/N)#(R".667)#IS".5)= 2.14 FEET/SEC <br />Q = A X V = 6.41 CFS <br />Q REQUIRED 5.82 <br />Collection Ditch CDD-1 will be a triangular channel 1.00 <br />feet deep with 3h:ly side slopes. With a freeboard of 0.3' <br />the total depth of collection ditch CDD-1 is 1.300 feet. <br />• The flow velocity is Blow enough that erosion will not be a <br />problem. <br />COLLECTION DITCH CDD-1 <br />ALTERNATE SIZE DESIGN <br />FLOW IN A TRIANGULAR CHANNEL <br />ENTER DEPTH D 1.000 FEET <br />ENTER SLOPE S 0.020 EXPRESS AS DECIMAL <br />ENTER "N" N 0.030 EXPRESS AS DECIMAL <br />ENTER SIDE SLOPE X 1.500 SLOPE = R:1 <br />AREA=(W#D)+(%#D"2)= 1.50 FEET"2 <br />WETTED PERIMETER=(W)+2((XD"2+D"2))".5 3.61 FEET <br />R=AREA/WETTED PERMITER 0.42 <br />V=(1.49/N)#(R".667)#(S".51= 3.91 FEET/SEC <br />Q = A X V = 5.87 CFS <br />Q REQUIRED 5.82 <br />Collection Ditch CDD-1 will be a triangular channel 1.00 <br />feet deep with 1.5h:1v side slopes. With a freeboard of 0.3' <br />the total depth of collection ditch CDD-1 is 1.300 feet. <br />• The flow velocity is slow enough that erosion will not be a <br />problem. <br />9-16 July 1991 <br />