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Riprap Sizing -Flume Outlet Channel V-Ditch <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 = 0.48 feet 5.79 inches Use 6" to 18" Rock <br />POND DEWATERING <br />USE A PUMP TO DEWATER <br />POND F <br />10-Year Event Water Volume <br />Volume <br />Pump Capacity <br />PUMP SIZE <br />Dewatering Time <br />3.26 <br />1062202 <br />425 <br />4" 11 HP <br />2499 Minutes <br />42 Hours <br />1.7 Days <br />Acre-Feet <br />Gallons <br />GPM <br />Pump capacity - 425 gpm with 60' head which includes head loss in pipe. <br />/ R-3 7 App-B-7i 9/26/05 <br />A f PRavE~ <br />`~/26/p5 <br />