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Ditch C19 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 1127.27 <br />Average Land Slope (percent): 5.7 <br />Time of Concentration (hrs): 0.26 <br />Graphical Peak Discharge <br />Project: NUCLA MINE <br />By: GL <br />Location: DITCH C19 <br />Checked: <br />1. Data: <br />Drainage area: .................... A <br />= 5.2000 Acres <br />Runoff Curve Number: ............. <br />CN = 78 <br />Time of Concentration: ........... <br />Tc = 0.26 <br />Date: 02/16/06 <br />Date Developed: <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 0.00 percent of A 0.0000 Acres <br />2. Frequency ........................yr = 1003. Rainfall,P(24-hour).............. in = 3.0 <br />4. Initial abstraction, Ia............ = 0.5641 <br />5. Compute Ia/P....................... = 0.1880 <br />6. Unit peak discharge, qu...... csm/in = 680.28 <br />7. Runoff,Q.........................in = 1.1288 <br />8. Pond & swap adjustment factor,...Fp = 1.00 <br />9. Peak Discharge,gp...............cfs = 6.2394 <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: 2.00 <br />Discharge: 6.20 cfs <br />Depth of Flow: 0.58 feet <br />Velocity: 3.35 fps <br />Channel Lining: GRASS <br />Freeboard: 0.30 feet <br />Attachment 2.05.3(3)-1 Page 21 March 2016 (TR -70) <br />