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• <br />u <br />• <br />2. Frequency ........................yr = 10 <br />3. Rainfall,P(24-hour) ..............in = 2.00 <br />4. initial abstraction, la............ = 0.3810 <br />5. Compute la/P ....................... = 0.1905 <br />6. Unit peak discharge, qu......csm/in = 714.44 <br />7. Runoff,Q .........................in = 0.7439 <br />8. Pond & swap adjustment factor,...Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs = 45.7428 <br />Time of Concentration (SCS Method) <br />Curve Number: 84 <br />Length of Flow (ft): 1354.62 <br />Average Land Slope Q: 6.40 <br />Time of Concentration (hrs): 0.23 <br />Pond Volume Calculation based on Universal Soil Loss Equation <br />Input Data <br />----------------------------------------------------------------------- <br />----------------------------------------------------------------------- <br />Landuse Area Rainfall Erod- Length Slope Ls Cf Pf <br />(ft^2) Factor ability (ft) (%) <br />----------------------------------------------------------------------- <br />----------------------------------------------------------------------- <br />DISTURBE 1870161.5 50.0 0.37 <br />UNDISTUR 529341.1 50.0 0.37 <br />Runoff = 1.000 inch. <br />Sediment Density = 62.400 <br />Time = 1.0 years <br />Drainage Ratio = 0.37 <br />Total Area = 55.085 acres <br />Gross Erosion = 1368.340 tons/yr. <br />Total Yield = 506.286 tons/yr. <br />REVISED MARCH 2006 <br />1354.6 6.4 2.69 0.50 1.00 <br />1354.6 6.4 2.69 0.50 1.00 <br />Attachment 205.3(3)-13-4 <br />