2014-09-22_PERMIT FILE - C1996083A (2)

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Spillway Pond J Determine flow velocity down 3h:1v embankment AREA= (W*D) +(X *D "2)= WETTED PERIMETER= (W) +2*[((X *D) "2 +D ^2) ^0.5] R= AREANVETTED PERIMETER V= (1.49/N) *(R ^.667) *(S ^.5) = Q =AXV= Q REQUIRED - Peak Discharge 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 Pond Dewatering FEET FEET EXPRESS AS DECIMAL EXPRESS AS DECIMAL SLOPE = X:1 20 inches POND J DEWATERING USE A PUMP WITH A CAPACITY TO DEWATER IN 48 -HOURS POND J Pond J Emergency Spillway VOLUME Manning's Equation PUMP CAPACITY 247 Flow In a Trapezoidal Channel DEPTH D 0.500 WIDTH W 5.000 Slope S 0.330 Mannings "N" N 0.040 SIDE SLOPE X 2.000 AREA= (W*D) +(X *D "2)= WETTED PERIMETER= (W) +2*[((X *D) "2 +D ^2) ^0.5] R= AREANVETTED PERIMETER V= (1.49/N) *(R ^.667) *(S ^.5) = Q =AXV= Q REQUIRED - Peak Discharge 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 Pond Dewatering FEET FEET EXPRESS AS DECIMAL EXPRESS AS DECIMAL SLOPE = X:1 20 inches POND J DEWATERING USE A PUMP WITH A CAPACITY TO DEWATER IN 48 -HOURS Acre -Feet Gallons GPM 3.00 FEET ^2 7.24 FEET 0.41 11.90 FT /SEC 35.69 CFS 31.00 CFS TR -84 Volume XI, App. B -7 02/14 POND J RUNOFF FROM 10 -YEAR, 24 -HOUR EVENT VOLUME 710738 PUMP CAPACITY 247 PUMP SIZE 4" Dewatering Time 2880.00 Minutes 48.00 Hours 2.00 Days Acre -Feet Gallons GPM 3.00 FEET ^2 7.24 FEET 0.41 11.90 FT /SEC 35.69 CFS 31.00 CFS TR -84 Volume XI, App. B -7 02/14