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<br />Runoff Curve Number and Runoff 07/25/1999 <br />Project: AMENDMENT By: GL Date: 07/25/99 <br />Location: POND 12 Checked: Date: <br />Developed <br />1. Runoff curve number (Cn) <br />Cover description CN Soil Type Area <br />DIST 89 C 23.180 Acres <br />UNDIST 80 C 10.000 Acres <br />CN (weighted): 86 <br />2. Runoff <br />Frequency .............. : 25 yr <br />Rainfall, P (24-hour) ..:2.40 in <br />Runoff, Q ..............: 1.18 in <br />Runoff Volume ........ ..:3.27 Acre-Ft <br />Pond Volume Calcul ation based on Unive rsal Soil Loss Equation <br />07/25/1999 <br />. ----------- <br />-- <br />Input Data <br />---------------- <br />--- <br />---- <br />--------- <br />-- <br />------- <br />------ <br />--------------------------------------- <br />- <br />------- <br />----- <br />--------- <br />Landuse Area ------- <br />Rainfall - <br />Erod- -------- <br />--------- <br />--------- <br />Length Slope Ls Cf Pf <br />(ft^2) <br />---------------- <br />---------------- Factor <br />--------- <br />--------- ability <br />------- <br />------- (ft) (%) <br />--------------------------------------- <br />--------------------------------------- <br />DIST 1473949.0 24.0 0.30 1995.0 10.8 6.84 0.50 1.00 <br />Runoff = 1.180 inch. <br />Sediment Density = 112.000 <br />Time = 3.0 years <br />Drainage Ratio = 0.37 <br />Total Area = 33.837 acres <br />Gross Erosion = 833.601 tons/yr. <br />Total Yield = 308.432 tons/yr. <br />Runoff Volume = 3.327 acre-ft <br />Sediment Volume = 0.379 acre-ft <br />Total Volume = 3.707 acre-ft <br />• Attachment 2.05.3(3)6-18 <br />