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Ditch C18 (Formerly East Ditch 00 7) <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 7113.73 <br />Average Land Slope (percent): 5 <br />Time of Concentration (hrs): 1.21 <br />Ditch C18 Upper Potion <br />Graphical Peak Discharge <br />Project: NUCLA MINE <br />Location: DITCH C18 <br />By: GL Date: 02/16/06 <br />Checked: Date: <br />Developed <br />1. Data: Drainage area: .................... A = 169.2000 Acres <br />Runoff Curve Number: ............. CN = 78 <br />Time of Concentration: ........... Tc = 1.21 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 1.00 percent of A 1.6920 Acres <br />2. Frequency ........................yr = 25 <br />3. Rainfall,P(24-hour).............. in = 2.40 <br />4. Initial abstraction, Ia............ = 0.5641 <br />5. Compute Ia/P....................... = 0.2350 <br />6. Unit peak discharge, qu...... csm/in = 282.11 <br />7. Runoff,Q.........................in = 0.7238 <br />8. Pond & swap adjustment factor .... Fp = 0.87 <br />9. Peak Discharge,gp...............cfs = 46.9679 <br />Ditch C18 — Lower Portion (Last 700 Feet to Culvert under Srh Street) <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL Date: 02/16/06 <br />Location: DITCH C18 LOWER PORTION Checked: Date: <br />Developed <br />1. Data: <br />Drainage area: .................... A = 222.7000 Acres <br />Runoff Curve Number: ............. CN = 78 <br />Time of Concentration: ........... Tc = 1.21 <br />Storm Type :....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 1.00 percent of A <br />Attachment 2.05.3(3)-1 Page 19 March 2016 (TR -70) <br />