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AREA=(W*D)+(X*D~)= <br />WETTED PERIMETER=(W)+2*[((X*D)2+D2)'i2] <br />R=AREANVETTED PERIMETER <br />V=(1.49/N)`(Rv3)`(S"~)= <br />Q=AXV= <br />Q REQUIRED -Peak Discharge <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 = 1.37 feet <br />DITCH R-5 <br />16.5 inches <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.47 <br />WIDTH W 12 <br />Slope S 0.22 <br />Mannings "N" N 0.04 <br />SIDE SLOPE X 2 <br />AREA=(W'`D)+(X*D2)= <br />WETTED PERIMETER=(W)+2*[((X*D)2+D2)'i2] <br />R=AREANVETTED PERIMETER <br />V=(1.49/N)*(R2/3)*(S 1/2)= <br />Q=AXV= <br />,,,~ Q REQUIRED -Peak Discharge <br />2.43 Feet2 <br />5.18 Feet <br />0.47 <br />11.25 Ft/Sec <br />27.31 CFS <br />27.04 CFS <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />6.08 Feet2 <br />14.10 Feet <br />0.43 <br />9.97 Ft/Sec <br />60.66 CFS <br />58.59 CFS <br />TR-16 83 05/08 <br />