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<br /> <br />• SEDIMENT POND EMERGENCY SPILLWAY <br />MANNING'S EQUATION <br />FLOW IN A TRAPEZOIDAL CHANNEL <br />DEPTH 0.600 FEET <br />BOTTOM WIDTH 8.500 FEET <br />SLOPE OF CHANNEL 0.010 EXPRESS AS DECIMAL <br />MANNINGS "N" 0.030 EXPRESS AS DECIMAL <br />SIDE SLOPE 3.000 SLOPE = X:1 <br />AREA=(W*D)+(X*D)= 6.18 FEET^2 <br />WETTED PERIMETER=(W)+2((XD^2+D^2))^.5 12.29 FEET <br />R=AREA/WETTED PERMITER 0.50 <br />V=(1.49/N)*(R^.667)*(S^,5)= 3.14 FT/SEC <br />Q = A X V = 19.40 CFS <br />Q REQUIRED 17.64 CFS <br />The spillwax for the sediment pond will be a trapazoidal channel 8.5 <br />feet wide with a flow depth of .6 feet and a freeboad of 12 inches. <br />Rip rap, 6" minus, will be laced in the channel to prevent erosion <br />where the flow enters the river. <br />• D50 = ((V X S^,17)/7.58))^2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 0.036 feet 0.430 inches <br />DITCH "B" <br />FLOW IN A TRIANGULAR CHANNEL <br />DEPTH 1.100 FEET 1.4' W/Freeboard <br />SLOPE OF DITCH 0.020 EXPRESS AS DECIMAL <br />MANNINGS "N" 0.030 EXPRESS AS DECIMAL <br />SIDE SLOPE 2.000 SLOPE = X:1 <br />AREA=(W*D)+(X*D)= <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 AREAS 1, 2, 3, 4 & 5 <br />• <br />2.42 FEET^2 <br />4.92 FEET <br />0.49 <br />4.38 FEET/SEC <br />10.59 CFS <br />9.16 <br />11-4 Rev. 02-15-94 <br />