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<br />• <br />Sediment Pond F <br />Pond F Emergency Spillway <br />Mannings Equation <br />Flow In a Trapizodial Channel <br />DEPTH D 1.100 FEET <br />WIDTH W 10.000 FEET <br />SLOPE S 0.020 EXPRESS AS DECIMAL <br />Mannings "N" N 0.040 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W*D)+(X*D^2)= <br />WETTED PERIMETER=(W)+2((XD^2+D^2))^.5 <br />R=AREA/WETTED PERMITER <br />V=(1.49/N)*(R^.667)*(S^.5)= <br />Q = A X V = <br />Q REQUIRED <br />Riprap Sizing <br />D50 <br />D50 <br />D50 <br />V <br />S <br />Across top of Embankment <br />Size of Riprap <br />((V X S^.17)/7.58))^2 <br />Diameter in feet <br />Velocity <br />Slope <br />D50 = 0.111 feet 1.331 inches <br />• <br />Determine Velocity of Flow Down 5:1 Embankment <br />13.42 FEET^2 <br />14.92 FEET <br />0.90 <br />4.91 FT/SEC <br />65.88 CFS <br />62.36 CFS <br />DEPTH D 0.550 FEET <br />WIDTH W 10.000 FEET <br />SLOPE 5 0.200 EXPRESS AS DECIMAL <br />Mannings "N" N 0.040 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W*D)+(X*D^2)= 6.11 FEET^2 <br />WETTED PERIMETER=(W)+2((XD^ 2+D^2))^.5 12.46 FEET <br />R=AREA/WETTED PERMITER 0.49 <br />V=(1.49/N)*(R^.667)*(S^.5)= 10.35 FT/SEC <br />Q = A X V = 63.21 CFS <br />Q REQUIRED 62.36 CFS <br />9-29 July 1992 <br />