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Ditch C13 <br />Time of Concentration (SCS Method) <br />Curve Number: 80 <br />Length of Flow (ft): 2047.49 <br />Average Land Slope (percent): 3.5 <br />Time of Concentration (hrs): 0.50 <br />Graphical Peak Discharge <br />Date: 02/16/06 <br />Location: DITCH C 13 Checked: <br />Developed <br />1. Data: <br />Project: NUCLA MINE <br />Date: <br />Drainage area: .................... A = 2 1. 1000 Acres <br />Runoff Curve Number: ............. CN = 80 <br />Time of Concentration: ........... Tc = 0.50 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 0.00 percent of A <br />0.0000 Acres <br />2. Frequency ........................yr = 100 <br />3. Rainfall,P(24-hour).............. in = 3.004. Initial abstraction, Ia. <br />5. Compute Ia/P....................... = 0.1667 <br />6. Unit peak discharge, qu...... csm/in = 504.29 <br />7. Runoff,Q.........................in = 1.2500 <br />8. Pond & swap adjustment factor .... Fp = 1.00 <br />9. Peak Discharge,gp...............cfs = 20.7825 <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: 7.00 <br />Discharge: 20.80 cfs <br />Depth of Flow: 0.54 feet <br />Velocity: 4.78 fps <br />Channel Lining: GRASS <br />Freeboard: 0.30 feet <br />By: GL <br />Attachment 2.05.3(3)-1 Page 15 March 2016 (TR -70) <br />