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2. Frequency ........................yr = 10 <br />3. Rainfall ,P(24 - hour) .............. <br />in = 2.00 <br />4. Initial abstraction, la............ <br />= 0.5000 <br />5. Compute la /P ....................... <br />= 0.2500 <br />6. Unit peak discharge, qu ...... csm /in = 608.01 <br />7. Runoff ,Q .........................in <br />= 0.5625 <br />8. Pond & swap adjustment factor .... Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs <br />= 1.4963 <br />DITCH C21 <br />Channel Type: Trapezoidal, Equal Side Slopes <br />Dimensions: Left Side Slope 2.00:1 <br />Right Side Slope 2.00:1 <br />Base Dimension: 0.00 <br />Wetted Perimeter: 2.61 <br />Area of Wetted Cross Section: 0.68 <br />Discharge: 1.50 cfs <br />Depth of Flow: 0.58 feet <br />Velocity: 2.21 fps <br />Channel Lining: EARTH <br />Freeboard: 0.30 feet <br />DITCH C22 <br />Time of Concentration (SCS Method) <br />Curve Number: 82 <br />Length of Flow (ft): 1298.60 <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -37 <br />