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• 4. Initial abstraction, la............ = 0.5000 <br />5. Compute la/P ....................... = 0.2500 <br />6. Unit peak discharge, qu......csm/in = 305.94 <br />7. Runoff,Q .........................in = 0.5625 <br />8. Pond & swap adjustment factor,...Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs = 19.9518 <br />DITCH C25 <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: 6.00 <br />Wetted Perimeter: 8.39 <br />Area of Wetted Cross Section: 3.78 <br />Discharge: 18.38 cfs <br />Depth of Flow: 0.53 feet <br />Velocity: 4.87 fps <br />Channe! Lining: EARTH WITH SOME GRASS <br />Freeboard: 0.30 feet <br />DITCH D108 <br />Time of Concentration (SCS Method) <br />• REVISED MARCH 2006 Attachment 2.05.3(3)-1-53 <br />