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Doc Date:12/11/2001 <br />Runoff Curve Number and Runoff 07/25/1999 <br />Project: AMENDMENT By: GL Date: 07/25/99 ' <br />Location~POND 11 5~1! Checked: Date: <br />Develope``d <br />1. Runoff curve number (Cn) <br />Cover description CN Soil Type Area <br />DIST 88 B 22.600 Acres <br />UNDIST 78 B 2.090 Acres <br />CN (weighted): 87 <br />2. Runoff <br />Frequency ..............: 25 yr <br />Rainfall, P (24-hour) ..:2.40 in <br />Runoff, O ..............:1.24 in <br />Runoff Volume ..........:2.55 Acre-Ft <br />III IIIIIIIIII'II'll <br />sss <br />Pond Volume Calculation based on Universal Soil Loss Equation 07/25/1999 <br />----------------------------------------------------------------------- <br />----------------------------------------------------------------------- <br />Input Data <br />Landuse Area Rainfall Erod- Length Slope Ls ' Cf Pf <br />(ft^2) <br />---------------- <br />---------------- Factor <br />-------- <br />-------- ability <br />------- <br />------- (ft) <br />-------- <br />-------- (°!o) <br />-------------------------------- <br />-------------------------------- <br />DIST 1075715.3 24.0 0.30 1500.0 3.6 1.06 0.50 1.00 <br />Runoff = 1.240 inch. <br />Sediment Density = 112.000 <br />Time = 3.0 years <br />Drainage Ratio = 0.37 <br />Total Area = 24.695 acres <br />Gross Erosion = 94.490 tons/yr. <br />Total Yield = 34.961 tons/yr. <br />Runoff Volume = 2.552 acre-ft <br />Sediment Volume = 0.043 acre-ft <br />Total Volume = 2.595 acre-ft <br />• <br />(Revised 12100) Attachment 2.05.3(3) -10-56 <br />