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• Trapezoidal Channels in C-Gulch <br />The trapezoidal channels in C-Gulch are riprap lined channels which will convey (lo~v around <br />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 0.75 FEET <br />WIDTH W 3.0 FEET <br />Slope S 0.05 EXPRESS AS DECIMAL <br />Mannings "N" N 0.04 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2.0 SLOPE = X:l <br />AREAfiV•D)+(X"D^2)= 3.38 FEET^2 <br />WETTED PERIMETER=(W )+2•[(( X'D)^2+D^ 2)^O.Sj 6.35 FEET <br />R=AREA/WETTED PERIM ETER 0.53 <br />V=(1.49/N)'(R^.667)'(5^.5) = 5.46 FT/SEC <br />Q=AXV= 18.44 CFS <br />• Q REQUIRED -Peak Discharge - C4 6.2 CFS <br />Ditch CS was replaced by a drop inlet -See Map 34. <br />Drainage Ditches C-C2, & C4 <br />Manning's Equation <br />Flow In a Trapezoidal Channel - Maximum Slope <br />DEPTH D 0.4 FEET <br />WIDTH W 3.0 FEET <br />Slope S 0.5 EXPRESS AS DECIM AL <br />Mannings "N" N 0.04 EXPRESS AS DECIM AL <br />SIDE SLOPE X 2.0 SLOPE = X:l <br />AREA=(W*D)+(X'D^2)= 1.52 FEET^2 <br />WETTED PERIMETER=(W)+2•[((X•D)^2 +D^2)^0.5] 4.79 FEET <br />R=AREA/WETTED PERIMETER 0.32 <br />V=(1.49/N)*(R^.667)'(S^.5)= 12.26 FT/SEC <br />Q=AXV= 18.63 CFS <br />• Q REQUIRED -Peak Discharge - C4 6.2 CFS <br />TR-0i EXH-8 -17 - <br />8/98 <br />