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Runoff Curve Number and Runoff 07/25/1999 <br />Project: AMENDMENT By: GL Date: 07/25/99 <br />Location: POND 11 Checked: Date: <br />Developed <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, Q ..............:1.24 in <br />Runoff Volume ..........:2.55 Acre-Ft <br />Pond Volume Calculation based on Universal Soil Loss Equation 07/25/1999 <br />----------------------------------------------------------------------- <br />------------------------ <br />Input Data -------- --------------------------------------- <br />L <br />d <br />A <br />f E <br />an <br />use <br />rea Rain <br />all rod- Length Slope Ls Cf Pf <br />(ft^2) Factor <br />------------------------ <br />------------------------ ability <br />-------- <br />-------- (ft) (%) <br />--------------------------------------- <br />--------- <br />----------------------------- <br />DIST 1075715.3 24.0 0.30 - <br />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 12/99) Attachment 2.05.3(3) -10-76 <br />