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• <br />U] <br />Trapezoidal Channel in C -Gulch <br />The trapezoidal channel in C -Gulch is a riprap lined channel which will convey Now <br />around the facilities areas. See Sedimentation Control Plan, Map No. 20. <br />Drainage Ditches C -C2 & C4 <br />Manning's Equation <br />Flow In a Trapezoidal Channel - Minimum Slope <br />DEPTH D 0.750 FEET <br />WIDTH W 3.000 FEET <br />Slope S 0.050 EXPRESS AS DECIMAL <br />Mannings "N" N 0.040 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA= (W*D) +(X *DA2)= <br />WETTED PERIMETER= (W) +2 *[((X *Dr2 +DA2)A0.51 <br />R= AREA/WETTED PERIMETER <br />V= (1.49 /N) *(RA.667) *(SA.5)= <br />Q =AXV= <br />Q REQUIRED - Peak Discharge - C4 <br />Drainage Ditches C -C2 & C4 <br />Manning's Equation <br />Flow In a Trapezoidal Channel - Maximum Slope <br />DEPTH D 0.400 <br />WIDTH W 3.000 <br />Slope S 0.500 <br />Mannings "N" N 0.040 <br />SIDE SLOPE X 2.000 <br />AREA= (W*D) +(X *DA2)= <br />WETTED PERIMETER= (W) +2 *[((X *D)A2 +DA2)A0.5] <br />R= AREA/WETTED PERIMETER <br />V= (1.49 /N) *(RA.667) -(SA.5 )_ <br />Q =AXV= <br />Q REQUIRED -Peak Discharge - C4 <br />PR -07 EXH -8 -14 <br />3.38 FEETA2 <br />6.35 FEET <br />0.53 <br />5.46 FT /SEC <br />18.44 CFS <br />6.22 CFS <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />1.52 FEETA2 <br />4.79 FEET <br />0.32 <br />12.26 FT /SEC <br />18.63 CFS <br />6.22 CFS <br />2/03 <br />