2013-06-05_PERMIT FILE - C1996083A (2)

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• Sediment Pond J Riprap Sizing - Down Face of Embankment - Pond J D50 = Size of Riprap D50 = ((V X S^.17)/7.58))^2 D50 = Diameter in feet V = Velocity S = Slope D50 = 1.7 feet 21 inches Ditch J-3 Ditch J-3 receives flow from Ditch J-8-2, J-9-2 and local flow. Because of the large flow, design as a trapezoidal channel. Drainage Ditch D-J-3 Manning's Equation Flow In a Trapezoidal Channel DEPTH D 1.400 FEET WIDTH W 3.000 FEET Slope S 0.006 EXPRESS AS DECIMAL Mannings "N" N 0.025 EXPRESS AS DECIMAL SIDE SLOPE X 1.500 SLOPE = X:1 AREA=(W"D)+(X"D^2)= WETTED PERIMETER=(W)+2"[((X"D)^2+D"2)^0.5] • R=AREAtWETTED PERIMETER V=(1.49/N)"(R^.667)"(S^.5)= Q=AXV= Q REQUIRED - Peak Discharge Ditch J-8-2 Ditch J-8-2 receives flow from its local drainage area , D-J8-1 and Ditch J-10. Because of the large flow, design as a trapezoidal channel. Drainage Ditch D-J8-2 Manning's Equation Flow In a Trapezoidal Channel 7.14 FEET^2 8.05 FEET 0.89 4.08 FT/SEC 29.14 CFS 28.35 CFS DEPTH D 0.400 FEET WIDTH W 3.000 FEET Slope S 0.125 EXPRESS AS DECIMAL Mannings "N" N 0.025 EXPRESS AS DECIMAL SIDE SLOPE X 1.500 SLOPE = X:1 AREA=(W"D)+(X"D^2)= WETTED PERIMETER=(W)+2"[((X`D)^2+D^2)^0.5] R=AREAIWETTED PERIMETER V=(1.49/N)"(R^.667)"(S^.5)= Q=AXV= Q REQUIRED - Peak Discharge TR-049 A PPR??D Exh-8 - 166 - 1.44 FEET^2 4.44 FEET 0.32 9.94 FT/SEC 14.32 CFS 12.44 CFS 10/07