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• Q =AXV= <br />Q REQUIRED - Peak Discharge <br />Riprap Sizing - Flume Outlet Channel <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 = 0.51 feet 6 inches Use 6" to 18" Rock <br />POND DEWATERING <br />USE A PUMP WITH A CAPACITY TO DEWATER IN 48 -HOURS <br />POND F <br />AS -BUILT WATER VOLUME 3.66 <br />VOLUME 1191299 <br />PUMP CAPACITY 414 <br />PUMP SIZE <br />is <br />Dewatering Time <br />4 " <br />2880.00 Minutes <br />48.00 Hours <br />2.00 Days <br />55.26 CFS <br />52.92 CFS <br />Acre -Feet <br />Gallons <br />GPM <br />Pump capacity - 409 gpm with 60' head which includes head loss in pipe. <br />TR -64 <br />am <br />