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PORTAL BENCH DITCH DESIGN DETAILS <br /> Drainage Area = 0.153 acres j <br /> Design Precip. = 1.8 inches .IU N 2 Y M5 <br /> (10-yr, 24-hr precip event) <br /> Pi„ivEO �0i1' <br /> Curve Number = 85 REvLAMATION DIVISION] <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-1A <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 S1/2 = 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 />