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• <br />~~ <br />Trapezoidal Channel in C-Gulch <br />The trapezoidal channel in C-Gulch is a riprap lined channel which will convey flow <br />around the facilities areas. See Sedimentation Control Plan, Map No. 20. <br />Drainage Ditches C-C2 & C4 <br />Mannings 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'D^2)= <br />WETTED PERIMETER=(W)+2*[((X*Dy`2+D^2)^0.5] <br />R=AREANVETTED PERIMETER <br />V=(1.49/N)'(R^.667)'(S^.5)= <br />Q=AXV= <br />Q REQUIRED -Peak Discharge - C4 <br />Drainage Ditches C-C2 & C4 <br />Mannings 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*D^2)= <br />WETTED PERIMETER=(W)+2'[((X*D)^2+D^2)^0.5] <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)'(R^.667)*(S^.5 )_ <br />Q=AXV= <br />Q REQUIRED -Peak Discharge - C4 <br />PR-07 EXH-8 -14 <br />3.38 FEET^2 <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 FEET^2 <br />4.79 FEET <br />0.32 <br />12.26 FT/SEC <br />18.63 CFS <br />6.22 CFS <br />2/03 <br />