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Ditch C1 <br />Time of Concentration (SCS Method) <br />Curve Number: 80 <br />Length of Flow (ft): 3808.95 <br />Average Land Slope (percent): 4.3 <br />Time of Concentration (hrs): 0.74 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL Date: 02/16/06 <br />Location: DITCH C 11 Checked: Date: <br />Developed <br />1. Data: <br />Drainage area: .................... A = 62.4000 Acres <br />Runoff Curve Number: ............. CN = 80 <br />Time of Concentration: ........... Tc = 0.74 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 0.20 percent of A 0.1248 Acres <br />2. Frequency ........................yr = 100 <br />3. Rainfall,P(24-hour).............. in = 3.00 <br />4. Initial abstraction, la............ = 0.5000 <br />5. Compute Ia/P....................... = 0.1667 <br />6. Unit peak discharge, qu...... csm/in = 404.737. Runoff,Q.........................in = 1.2500 <br />8. Pond & swap adjustment factor .... Fp = 0.97 <br />9. Peak Discharge,gp...............cfs = 47.8471 <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: 8.00 <br />Wetted Perimeter: 11.53 <br />Area of Wetted Cross Section: 7.56 <br />Discharge: 47.80 cfs <br />Depth of Flow: 0.79 feet <br />Velocity: 6.33 fps <br />Channel Lining: GRASS RECLAIMED <br />Freeboard: 0.30 feet <br />Attachment 2.05.3(3)-1 Page 13 March 2016 (TR -70) <br />