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Runoff Curve Number: ............. <br />CN = 80 <br />Time of Concentration: ........... <br />Tc = 1.01 <br />Storm Type: ....................... <br />=11 <br />Pond and swamp areas spread <br />throughout watershed ............... <br />= 0.00 percent of A <br />0.0000 Acres <br />2. Frequency ........................yr <br />= 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 <br />...... csm/in = 305.94 <br />7. Runoff, Q .........................in <br />= 0.5625 <br />8. Pond & swap adjustment <br />factor .... Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs <br />= 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 />Channel Lining: EARTH WITH SOME GRASS <br />Freeboard: 0.30 feet <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -43 <br />