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Design Calculations - Topsoil Stockpile Containment Ditch <br />.• <br />Hydrology <br />Hydrology Inputs <br />All hydrology inputs are shown on Table 236. SEDCAD+ Version <br />3. Topsoil Stockpile Containment Ditch. <br />Hydrology Results <br />Runoff Volume <br />10-year. 24-hour event: .O1 ac-ft <br />Sedimentology <br />Universal Soil Loss Equation <br />A=RKLSCP <br />A = 40x0.3x.18x1.Ox1.Ox1.0 = 2.16 tons/acre/year <br />Sediment Volume = 2.16 tons/acre/year x 0.25 acres = 0.54 <br />tons/year <br />= 0.54 tons x 2000 lb/ton x 1/60ft'/year <br />= 18ft' x1/43560 ac-ft/ft3 = 0.0004 ac-ft <br />Total Required Storage Volume <br />.O1 ac-ft + .0004 ac-ft = .0104 ac-ft <br />•. <br />T. <br /> <br />C ~WORKIPRMQP2fiRIR I].REV <br />ov~s~ ~~ 175R Revised - April 1993 <br />