Laserfiche WebLink
• Sediment Pond F <br /> Pond F Emergency Spillway <br /> Manning's 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 /> N <br /> Mannings 'I " N 0.040 EXPRESS AS DECIMAL <br /> = <br /> SIDE SLOPE X 2.000 SLOPE X: 1 <br /> AREA=(W*D)+(X*D^2)= ✓13 .42 FEET^2 <br /> WETTED PERIMETER=(W)+2 ( (XD^2+DA2) ) A . 5 ✓14 .92 FEET <br /> R=AREA/WETTED PERMITER ✓0.90 <br /> V=(1.49/N) * (R^ . 667) * (S^ . 5) = ✓4 .91 FT/SEC <br /> ✓65. 88 CFS <br /> Q = A X V = <br /> 62 . 36 CFS <br /> Q REQUIRED <br /> Riprap Sizing - Across top of Embankment <br /> D50 = Size of Riprap <br /> D50 = ( (V X S^ . 17)/7 . 58) ) ^2r� <br /> • D50 = Diameter in feet <br /> V = Velocity <br /> S = Slope <br /> D50 = ✓0. 111 feet 1.331 inches <br /> Determine Velocity of Flow Down 5: 1 Embankment <br /> DEPTH D 0. 550 <br /> ? FEET <br /> WIDTH W 1 :000 FEET <br /> SLOPE S 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 ( (XDA2+DA2) ) A . 5 v12 .46 FEET <br /> R=AREA/WETTED PERMITER ✓0.49 <br /> V=(1.49/N) * (RA . 667) * (S^ . 5)= ✓10. 35 FT/SEC <br /> Q = A X V = ✓63 .21 CFS <br /> Q REQUIRED 62 . 36 CFS <br /> • <br /> 9-29 July 1992 <br /> I <br /> I <br />