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R=AREA/WETTED PERIMETER <br />V=(1.49/N)*(R")*(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 />V = Velocity <br />S =Slope <br />D50 = 0.06 feet <br />[11911 <br />3.54 Ft/Sec <br />14.9 CFS <br />14.1 CFS <br />0.69 inches None required <br />Pond D Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.2 <br />FEET <br />WIDTH W 10 <br />FEET <br />Slope S 0.33 <br />EXPRESS AS DECIMAL <br />Mannings "N" N 0.03 <br />EXPRESS AS DECIMAL <br />SIDE SLOPE X 2 <br />SLOPE = X:1 <br />AREA=(W*D)+(X*D2)= <br />1.76 Feet2 <br />WETTED PERIMETER=(W)+2*[((X*D)2+D2)112] <br />10.76 Feet <br />R=AREA/WETTED PERIMETER <br />0.16 <br />V=(1.49/N)*(R")*(S1/2)= <br />8.53 Ft/Sec <br />Q=AXV= <br />15.0 CFS <br />Q REQUIRED - Peak Discharge <br />14.1 CFS <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 = 0.87 feet 10.41 <br />inches Use 12" Riprap <br />TR -98 Exh. 8-19 01/15 <br />