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2. Frequency ........................yr <br />= 10 <br />3. Rainfall ,P(24 - hour) .............. <br />in = 2.00 <br />4. Initial abstraction, la............ <br />= 0.4390 <br />5. Compute la /P ....................... <br />= 0.2195 <br />6. Unit peak discharge, qu ...... <br />csm/in = 445.86 <br />7. Runoff, Q .........................in <br />= 0.6487 <br />8. Pond & swap adjustment <br />factor .... Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs <br />= 17.4753 <br />DITCH C31 <br />Channel Type: Trapezoidal, Equal Side Slopes <br />Dimensions: Left Side Slope 1.00:1 <br />Right Side Slope 1.00:1 <br />Base Dimension: 5.00 <br />Wetted Perimeter: 7.30 <br />Area of Wetted Cross Section: 4.73 <br />Channel Slope: 2.0000 <br />Manning's n of Channel: 0.0425 <br />Discharge: 17.50 cfs <br />Depth of Flow: 0.81 feet <br />Velocity: 3.70 fps <br />Freeboard: 0.30 feet <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -60 <br />