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Ditch C20 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 3307.85 <br />Average Land Slope (percent): 5.2 <br />Time of Concentration (hrs): 0.64 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL <br />Location: DITCH C20 Checked <br />Developed <br />1. Data: <br />Drainage area: .................... A = 115.6000 Acres <br />Runoff Curve Number: ............. CN = 78 <br />Time of Concentration: ........... Tc = 0.64 <br />Date: 02/17/06 <br />Date: <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 3.00 percent of A <br />3.4680 Acres <br />2. Frequency ........................yr = 100 <br />3. Rainfall,P(24-hour).............. in = 3.00 <br />4. Initial abstraction, Ia............ = 0.5641 <br />5. Compute Ia/P....................... = 0.18806. <br />6. Unit peak discharge, qu...... csm/in = 430.07 <br />7. Runoff,Q.........................in = 1.1288 <br />8. Pond & swap adjustment factor,...Fp = 0.75 <br />9. Peak Discharge,gp...............cfs = 65.7668 <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: 14.06 <br />Area of Wetted Cross Section: 10.72 <br />Discharge: 65.80 cfs <br />Depth of Flow: 0.91 feet <br />Velocity: 6.14 fps <br />Channel Lining: GRASS <br />Freeboard: 0.30 feet <br />Attachment 2.05.3(3)-1 Page 22 March 2016 (TR -70) <br />