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I• <br />Trapezoidal Channel in C-Gulch <br />Riprap Sizing -Trapezoidal Channel C2 & C4 <br />D50 =Size of Riprap <br />D50 = ((V X S^.17)/7.58))^2 <br />D50 = Diameter in feet <br />V =Velocity <br />S =Slope <br />D50 = <br />2.1 feet 25 inches <br />Drainage channels C2, & C4 will be constructed at least 3-feet wide at the bottom with 2H:1 V side slopes, <br />2-feet deep including freeboard with D50 riprap of 24inches. <br />Drainage Ditches C6, C9, & C14 <br />Mannings Equation <br />Flow In a Trapezoidal Channel -Minimum Slope <br />J <br />DEPTH D 0.800 FEET <br />WIDTH W 6.000 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^2p <br />WETTED PERIMETER=(W~2'[((X`Dr2+D^2)^0.5] <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)'(R^.667)'(S^.5p <br />O=AXV= <br />O REQUIRED -Peak Discharge - C14 <br />6.08 FEET^2 <br />9.58 FEET <br />0.63 <br />6.15 FT/SEC <br />37.41 CFS <br />37.37 CFS <br />Drainage Ditches C6, C9, & C14 <br />Mannings Equation <br />Flow In a Trapezoidal Channel -Maximum Slope <br />u <br />DEPTH D 0.430 FEET <br />WIDTH W 6.000 FEET <br />Slope S 0.500 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^2p 2.95 FEET^2 <br />WETTED PERIMETER=(W)+2'[((X'Dy`2+D^2)^0.5 ] 7.92 FEET <br />R=AREANVETTED PERIMETER 0.37 <br />V=(1.49/N)'(R^.667)'(5^.5)= 13.63 FT/SEC <br />O=AXV= 40.21 CFS <br />O REQUIRED -Peak Discharge - C14 37.37 CFS <br />TR-027 EXH-8 -1 S 6103 <br />APPRo~6D g~s~-~o3 <br />