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a <br />l1 i <br />f <br />PORTAL BENCH DITCH DESIGN DETAILS <br />Drainage Area = 0.153 acres <br />Design Precip. = 1.8 inches <br />(10-yr, 24-hr precip event) <br />Curve Number = 85 <br />Storm Runoff = 0.65 inches <br />Peak Discharge is less than 2 cfs/inch runoff <br />Determined from Procedures for Determining Peak Flows in Colorado, <br />Figure S-lA <br />Peak Discharge is less than 1.3 cfs <br />Ditch Structure <br />Length = 28 ft . <br />Slope = 1:1 ~ - _ <br />Velocity = 1.49 R2 /3 51/2 = 18 ft/sec <br />n <br />Parabolic Channel <br />Area = .072 ft3 <br />Depth = 0.25 ft <br />Top Width = 0.44 ft ', <br />n = 0.025 <br />