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Ditch C12 <br />Time of Concentration (SCS Method) <br />Curve Number: 80 <br />Length of Flow (ft): 1780.53 <br />Average Land Slope (percent): 5.8 <br />Time of Concentration (hrs): 0.35 <br />Graphical Peak Discharge Project: NUCLA MINE By: GL Date: 02/16/06 <br />Location: DITCH C12 Checked: Date Develop: <br />1. Data: <br />Drainage area: .................... A = 15.2000 Acres <br />Runoff Curve Number: ............. CN = 80 <br />Time of Concentration: ........... Tc = 0.35 <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 = 3.00 <br />4. Initial abstraction, Ia............ = 0.5000 <br />5. Compute Ia/P....................... = 0.1667 <br />6. Unit peak discharge, qu...... csm/in = 605.20 <br />7. Runoff,Q.........................in = 1.2500 <br />8. Pond & swap adjustment factor .... Fp = 1.00 <br />9. Peak Discharge,gp...............cfs = 17.9667 <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: 4.00 <br />Wetted Perimeter: 6.69 <br />Area of Wetted Cross Section: 3.13 <br />Discharge: 18.00 cfs <br />Depth of Flow: 0.60 feet <br />Velocity: 5.74 fps <br />Freeboard: 0.30 feet <br />MANNING'S N =.30 FOR GRASS CHANNEL <br />Attachment 2.05.3(3)-1 Page 14 March 2016 (TR -70) <br />