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<br /> <br />• P1INE N0. 1 <br />Diversion Ditch with Filter Dam/Dugout Ponds <br />for Sediment Control <br />Size Calculation <br />Drainage Basin Area 16 acres <br />Average Slope 36Y <br />Soil Group L <br />Curve Number 70 <br />Runoff .30 inches <br />Slope Adjustment Factor 1.14 <br />1Peak Flow for 10 year, 24-hour event - .30 cfs/in of runoff x slope <br />adjustment factor <br />Peak Flow <br />2Ditch Size <br />6.84 cfs <br />Q° K D 8/3 S1/2 <br />N <br />Q = 6.84 <br />K = 8.5 <br />N = ,030 <br />S = .02 <br />6.84 = 803 D 8/3 (.02) 1/2 <br />D 8/3 = (6.84) .03 <br />(.02)' (8.5) <br />D = .85 feet <br />1 Peak Flow determined from "Procedures for Determining Peak Flows in <br />Colorado", SCS, U.S. Department of Agriculture, Ilarch 1980 <br />2 Ditch Size determined by I~tannings Equation for Open Channel Flow <br />