Laserfiche WebLink
~~ Riprap Sizing -Across Embankment <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 = 1.03 feet <br />DITCH R-6 <br />12.4 inches <br />Manning's Equation <br />Flow In a Trapezoidal ChannE;l <br />DEPTH D 0.65 FEET <br />WIDTH W 12 FEET <br />Slope S 0.075 EXPRESS AS DECIMAL <br />Mannings "N" N 0.04 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2 SLOPE = X:1 <br />* <br />` <br />2 <br />AREA=(W <br />D)+(X <br />D <br />)= 8.65 Feet2 <br />WETTED PERIMETER=(W)+2*~(( X*p)2+p2)v2~ 14.91 Feet <br />R=AREANVETTED PERIMETER 0.58 <br />V=(1.49/N)*(Ry3)*(S~~)= <br /> 7.09 FUSec <br />Q=AXV= 61.33 CFS <br />Q REQUIRED -Peak Discharge 60.67 CFS <br />Riprap Sizing -Across Embankment <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 = 0.36 feet 4.4 inches <br /> <br />TR-16 84 05/08 <br />