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Ditch F4 <br />Manning's Equation <br />Flow In a Triangular Channel <br />Depth <br />D <br />1.4 <br />Feet <br />Width <br />W <br />0 <br />Feet <br />Slope <br />S <br />0.3 <br />Express as Decimal <br />Mannings "N" <br />N <br />0.04 <br />Express as Decimal <br />Side Slope <br />X <br />1.5 <br />Slope = X:1 <br />AREA=(W*D)+(X*D^2)= <br />WETTED PERIMETER=(W)+2*[((X*D)"2+D^2)^0.5] <br />R=AREANVETTED PERIMETER <br />IV=(1.49/N)*(R^.667)*(S^.5)= <br />IQ=AXV= <br />IQ REQUIRED - Peak Discharge <br />IRiprap Sizing - Ditch F-4 <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 = 2.27 feet <br />2.82 FEET "2 <br />4.94 FEET <br />0.57 <br />14.03 FT/SEC <br />39.49 CFS <br />39.22 CFS <br />27 inches Use 24" Rock <br />TR -98 App. B-32 04/15 <br />