Laserfiche WebLink
I• <br />Spillway Pond F <br />Determine flow characteristics down 10% Grade <br />Pond F Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />• <br />Depth D 0.84 Feet <br />Width W 5 Feet <br />Slope S 0.10 Express as Decimal <br />Mannings "N" N 0.04 Express as Decimal <br />Side Slope X 2 Slope = X:1 <br />AREA=(W*D)+(X*D^2)= <br />WETTED PERIMETER=(W)+2*[((X*D)^2+D^2)^0.5] <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)*(R^.667)*(S^.5)= <br />Q=AXV= <br />Q REQUIRED -Peak Discharge <br />Sediment Pond F <br />Riprap Sizing -Down Face of Embankment -Pond F <br />5.61 FEET^2 <br />8.76 FEET <br />0.64 <br />8.76 FT/SEC <br />49.13 CFS <br />48.59 CFS <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 = 0.61 feet 7 inches Use 6" to 18" Rock <br />LJ <br />`r/Z 37 <br />fi PPRo vE~ <br />9~zs~n5 <br />App-B -6- 619/05 <br />