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Ditch C-4 <br />Time of Concentration (SCS Method) <br />Curve Number: 81 <br />Length of Flow (ft): 4924.62 <br />Average Land Slope (percent): 7.8 <br />Time of Concentration (hrs): 0.66 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL Date: 02/16/06 <br />Location: DITCH C-4 Checked: Date Developed: <br />1. Data: <br />Drainage area: A = 99.2000 Acres <br />Runoff Curve Number: CN = 81 <br />Time of Concentration: Tc = 0.66 <br />Storm Type = II <br />Pond and swamp areas spread throughout watershed = 1.00 percent of A 0.9920 Acres <br />2. Frequency .......................yr = 10 <br />3. Rainfall,P(24-hour).............. in = 2.00 <br />4. Initial abstraction, Ia............ = 0.4691 <br />5. Compute Ia/P....................... = 0.2346 <br />6. Unit peak discharge, qu...... csm/in = 405.21 <br />7. Runoff,Q.........................in = 0.6045 <br />8. Pond & swap adjustment factor,...Fp = 0.87 <br />9. Peak Discharge,gp...............cfs = 33.0340 <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: 10.00 <br />Wetted Perimeter: 12.10 <br />Area of Wetted Cross Section: 5.15 <br />Discharge: 33.00 cfs <br />Depth of Flow: 0.47 feet <br />Velocity: 6.41 fps <br />Freeboard: 0.28 feet <br />Attachment 2.05.3(3)-1 Page 11 March 2016 (TR -70) <br />