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Developed <br />1. Data: <br />Drainage area: .................... <br />A = 5.3000 Acres <br />Runoff Curve Number: ............. <br />CN = 81 <br />Time of Concentration: ........... <br />Tc = 0.18 <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 />= 100 <br />3. Rainfall ,P(24 - hour) .............. <br />in = 3.00 <br />4. Initial abstraction, la............ <br />= 0.4691 <br />5. Compute la /P ....................... <br />= 0.1564 <br />6. Unit peak discharge, qu <br />...... csm/in = 804.35 <br />7. Runoff, Q .........................in <br />= 1.3135 <br />8. Pond & swap adjustment <br />factor .... Fp = 1.00 <br />9. Peak Discharge,gp ...............cfs <br />= 8.7492 <br />DITCH C3 <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: 5.00 <br />Wetted Perimeter: 6.22 <br />Area of Wetted Cross Section: 1.51 <br />Discharge: 8.70 cfs <br />Depth of Flow: 0.27 feet <br />Velocity: 5.76 fps <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -12 <br />