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Ditch C29 <br />See Pond 015 design in Attachment 2.05.3(3)-33 for ditch design <br />Ditch D108 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 2769.73 <br />Average Land Slope (percent): 6.4 <br />Time of Concentration (hrs): 0.50 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL Date: 02/17/06 <br />Location: DITCH D108 Checked: Date: <br />Developed <br />1. Data: Drainage area: .................... A = 41.7000 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 ............... = 3.00 percent of A <br />1.2510 Acres <br />2. Frequency ........................yr = 10 <br />3. Rainfall,P(24-hour).............. in = 2.00 <br />4. Initial abstraction, Ia............ = 0.5641 <br />5. Compute Ia/P....................... = 0.2821 <br />6. Unit peak discharge, qu...... csm/in = 452.95 <br />7. Runoff,Q.........................in = 0.4844 <br />8. Pond & swap adjustment factor,...Fp = 0.75 <br />9. Peak Discharge,gp...............cfs = 10.7219 <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 />Wetted Perimeter: 5.03 <br />Area of Wetted Cross Section: 2.27 <br />Discharge: 10.70 cfs <br />Depth of Flow: 0.68 feet <br />Velocity: 4.70 fps <br />Channel Lining: EARTH WITH SOME GRASSFreeboard: 0.30 feet <br />Attachment 2.05.3(3)-1 Page 24 March 2016 (TR -70) <br />