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3. Rainfall ,P(24 - hour) .............. <br />in = 3.0 <br />4. Initial abstraction, la............ <br />= 0.5641 <br />5. Compute la /P ....................... <br />= 0.1880 <br />6. Unit peak discharge, qu ...... <br />csm/in = 680.28 <br />7. Runoff, Q .........................in <br />= 1.1288 <br />8. Pond & swap adjustment <br />factor .... Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs <br />= 6.2394 <br />DITCH C19 <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: 2.00 <br />Discharge: 6.20 cfs <br />Depth of Flow: 0.58 feet <br />Velocity: 3.35 fps <br />Channel Lining: GRASS <br />Freeboard: 0.30 feet <br />DITCH C20 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 3307.85 <br />Average Land Slope (percent): 5.2 <br />Time of Concentration (hrs): 0.64 <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -34 <br />