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Spillway Pond F <br />Determine flow characteristics down 10.3% Grade <br />Pond F Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth D 0.89 <br />Width W 5 <br />Slope S 0.103 <br />Mannings "N" N 0.04 <br />Side Slope X 2 <br />AREA=(W*D)+(X*D^2)= <br />WETTED PERIMETER=(W)+2*[(( X*D)^2+D^2)^0.5] <br />R=AREANVETTED PERIMETER <br />V=(1.49/N)*(R^.667)*(S^.5)= <br />Q=AXV= <br />Q REQUIRED -Peak Discharge <br />Feet <br />Feet <br />Express as Decimal <br />Express as Decimal <br />Slope = X:1 <br />6.03 FEET^2 <br />8.98 FEET <br />0.67 <br />9.17 FT/SEC <br />55.34 CFS <br />55.21 CFS <br />Sediment Pond F <br />Riprap Sizing -.Down Face of Embankment -Pond F <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 = 0.68 feet 8 inches Use 6" to 18" Rock <br />App. B-6 <br />09/06 <br />TR-43 <br />/)~pRavsp <br />9 /l~/a6 <br />