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Riprap Sizing -Drainage Ditch D-H7 1% Slope Reach <br />D50 =Size of Riprap <br />D50 = ((V X S^.17u7.56))^2 <br />D50 =Diameter in feet <br />V =Velocity <br />S =Slope <br />D50 = 0.02 feet <br />None Required <br />DEPTH D 0.190 FEET <br />WIDTH W 1.000 FEET <br />Slope S 0.010 EXPRESS AS DECIMAL <br />Mannings "N" N 0.015 EXPRESS AS DECIMAL <br />SIDE SLOPE X 1.OD0 SLOPE = X:1 <br />AREA=(W'D)+(X'D^2)= 0.23 FEET^2 <br />WETTED PERIMETER=(W)+2'[(( X'D)^2+D^2)^0.5] 1.54 FEET <br />R=AREA/WETTED PERIMETER 0.15 <br />Concrete Ditch <br />Flow From I-1 and J 4 -10 Year Event <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />0.3 inches <br />V=(1.49/N)'(R^.667)'(S^.5)= 2.77 FT/SEC <br />O=AXV= 0.63 CFS <br />Q REQUIRED -Peak Discharge 0.60 CFS <br />ATR-045 <br />/! PP,eou~7j <br />7/ 3~D"7 <br />Exh-8 - 171 - <br />04/07 <br />