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<br />_ COLLECTION DITCH CD-2 <br />1.0$ SIAPE AREA <br />FLAW FROM DRAINAGE AREA NO. 2 & B <br />FIAW IN A TRIANGULAR CHANNEL <br />DEPTH D 1.750 <br />SLOPE S 0.010 <br />MANNINGS "N" N 0.030 <br />DITCH SIDE SLOPE X 1.500 <br />AREA=(W*D)+(X*D)= <br />WETTED PERIMETER=(W)+2((XD^2+D^2))^.5 <br />R=AREA/WETTED PERMITER <br />V=(1.49/N)*(R^.667j*(S^.5)= <br />Q = A X V = <br />Q REQUIRED <br />4.59 FEET^2 <br />6.31 FEET <br />0.73 <br />4.02 FEET/SEC <br />18.46 CFS <br />17.81 <br />Collection ditch CD-2 will be a V ditch 2.000 feet deep. <br />1.5h:1v side slopes. With a freeboard of 0.3' the total depth <br />of CD-2 is 2.300 feet. The flow velocity is slow enough <br />erosion should not be a problem. <br />COLLECTION DITCH CD-A <br />FLOW FROM DRAINAGE AREA NO. A <br />FLOW IN A TRIANGULAR CHANNEL <br />DEPTH D 0.800 <br />SLOPE S 0.010 <br />MANNINGS "N" N 0.030 <br />DITCH SIDE SLOPE X 1.500 <br />AREA=(W*D)+(X*D)= <br />WETTED PERIMETER=(W)+2((XD^2+D^2))^.5 <br />R=AREA/WETTED PERMITER <br />V=(1.49/N)*(R^.667)*(S^.5)= <br />Q = A X V = <br />Q REQUIRED <br />0.96 FEET^2 <br />2.88 FEET <br />0.33 <br />2.39 FEET/SEC <br />2.29 CFS <br />1.83 <br />Collection ditch CD-A will be a V ditch 0.800 feet deep. <br />1.5h:1v side slopes. With a freeboard of 0.3' the total depth <br />of CD-A is 1.100 feet. The flow velocity is slow enough <br />erosion should not be a problem. <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br /> <br />