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• Runoff Curve Number and Runoff 07/25/1999 <br /> <br />• <br />Project: AMENDMENT By: GL Date: 07/25/99 <br />Location: POND 73 Checked: Date: <br />Developed <br />1. Runoff curve number (Cn) <br />Cover description CN Soil Type Area <br />DIST 91 D 23.610 Acres <br />UNDIST 83 D 14.500 Acres <br />CN (weighted): 88 <br />2. Runoff <br />Frequency ..............: 25 yr <br />Rainfall, P (24-hour) ..:2.40 in <br />Runoff, Q ..............:1.29 in <br />Runoff Volume ..........:4.11 Acre-Ft <br />Pond Volume Calculation based on Universal Soil Loss Equation 07/25/1999 <br />Input Data <br />Landuse Area Rainfall Erod- <br />(ft^2) Factor ability <br />------------------------------ <br />------------------------------ <br />DIST 1659849.1 24.0 0.28 <br />Length Slope Ls Cf Pf <br />(ft) (%) <br />-------------------------------------- <br />-------------------------------------- <br />2635.0 13.2 10.79 0.50 1.00 <br />Runoff = 1.290 inch. <br />Sediment Density = 112.000 <br />Time = 3.0 years <br />Drainage Ratio = 0.37 <br />Total Area = 38.105 acres <br />Gross Erosion = 1381.369 tons/yr. <br />Total Yield = 511.107 tons/yr. <br />Runoff Volume = 4.096 acre-ft <br />Sediment Volume = 0.629 acre-ft <br />Total Volume = 4.725 acre-ft <br />Pond Report Pond 013 <br />07/30/1999 <br />Attachment 2.05.3(3)6-20 <br />