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• WIDTH W 10 <br />Slope S 0.02 <br />Mannings "N" N 0.03 <br />SIDE SLOPE X 2 <br />AREA= (W *D) +(X *D <br />WETTED PERIMETER= (W) +2 *[((X *D) +D <br />R= AREA/WETTED PERIMETER <br />V= (1.49 /1\1) *(R <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />Riprap Sizing - Across top of 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 = 0.08 feet <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />5.50 Feet <br />12.24 Feet <br />0.45 <br />4.12 Ft/Sec <br />22.7 CFS <br />7.5 CFS <br />0.94 inches Use Pit Run Material <br />Pond D Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.4 <br />WIDTH W 5 <br />Slope S 0.02 <br />Mannings "N" N 0.03 <br />SIDE SLOPE X 2 <br />AREA= (W *D) +(X *D <br />WETTED PERIMETER= (W) +2 *[((X *D) +D <br />R= AREA/WETTED PERIMETER <br />V= (1.49 /N) *(R2 3) *(S1i2)= <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />Riprap Sizing - Across top of Embankment <br />. D50 = Size of Riprap <br />D50 = ((V X S ^.17)/7.58)) ^2 <br />D50 = Diameter in feet <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />2.32 Feet <br />6.79 Feet <br />0.34 <br />3.43 Ft/Sec <br />8.0 CFS <br />7.5 CFS <br />Exh 8 -19 <br />08/09 <br />TR -64 <br />h►PF/2.oV �D <br />