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Ditch C17 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 2636.71 <br />Average Land Slope (percent): 6.1 <br />Time of Concentration (hrs): 0.50 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL Date: 02/16/06 <br />Location: DITCH C17 Checked: Date: <br />Developed <br />1. Data: <br />Drainage area: .................... A = 31.8000 Acres <br />Runoff Curve Number: ............. CN = 78 <br />Time of Concentration: ........... Tc = 0.50 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 0.20 percent of A <br />0.0636 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....................... = 0.1880 <br />6. Unit peak discharge, qu...... csm/in = 494.79 <br />7. Runoff,Q.........................in = 1.1288 <br />8. Pond & swap adjustment factor,...Fp = 0.97 <br />9. Peak Discharge,gp............... cfs = 26.9194 <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: 5.00 <br />Wetted Perimeter: 9.73 <br />Area of Wetted Cross Section: 7.52 <br />Discharge: 26.90 cfs <br />Depth of Flow: 1.06 feet <br />Velocity: 3.58 fps <br />Channel Lining: GRASS RECLAIMED <br />Freeboard: 0.30 feet <br />Attachment 2.05.3(3)-1 Page 18 March 2016 (TR -70) <br />