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DITCH C30 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: BL Date: 17/15/09 <br />Location: DITCH C30 Checked: Date: <br />Developed <br />1. Data: <br />Drainage area: .................... <br />A = 7.4660 Acres <br />Runoff Curve Number: ............. <br />CN = 82 <br />Time of Concentration: ........... <br />Tc = 0.43 <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 />= 0.4390 <br />5. Compute la /P ....................... <br />= 0.2195 <br />6. Unit peak discharge, qu <br />...... csm/in = 520.97 <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 />= 3.9426 <br />DITCH C30 <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: 3.00 <br />Wetted Perimeter: 4.13 <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -58 <br />