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A = RKLSCP <br />• Where A = Sediment Yield (tons/acre/year) <br />R = Rainfall Factor: 50 (Ref:SCS) <br />K = Soil Erodibility Factor: 0.32 (Ref:SCS) <br />LS = Weighted Length Slope Factor <br />52.4%, LS=0.23 <br />19.8q, LS=1.60 <br />27.8, LS=6.00 <br />Use LS = 2.10 <br />CP = Control Practice Factor: 1.00 <br />A = (50)(0.32)(2.10)(1.00) <br />= 33.60 tons/acre/year <br />Contributing Area (Subwatersheds 2 and 3): <br />6.54 acres + 10.88 acres = 17.42 acres <br />• Sediment Volume: <br />33.60 tons/acre/yr x 17.42 acres x 2,000 lbs/ton x 1 yr <br />x ft3 x acre = 0.67 acre-feet <br />40 lbs 43,560 <br />Reouired Storaoe Capacity <br />Storage Capacity = 10-year, 24-hour runoff volume + Sediment Volume + <br />Dead Storage <br />= 2.64 ac-ft = 0.67 ac-ft + .13 ac-ft <br />= 3.44 ac-ft <br />(Refer to the Sedimentation Pond No. 5 Design Map (Map 24), <br />for the Stage/Storage Curve and Storage Capacity Table) <br />• <br />80 R Revised - December, 1991 <br />