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CULVERT 103 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 7113.73 <br />Average Land Slope (percent): 5.00 <br />Time of Concentration (hrs): 1.21 <br />CULVERT 103 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL <br />Location: CULVERT 103 Checked: <br />Present <br />1. Data: <br />Drainage area: .................... A = 226.8000 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 />Date: 02/20/06 <br />throughout watershed ............... = 1.00 percent of A <br />2.2680 Acres <br />2. Frequency ........................yr = 10 <br />3. Rainfall,P(24- hour) .............. <br />in = 2.00 <br />4. Initial abstraction, la............ <br />= 0.5641 <br />5. Compute la /P ....................... <br />= 0.2821 <br />6. Unit peak discharge, qu <br />...... csm /in = 267.92 <br />7. Runoff ,Q .........................in = 0.4844 <br />8. Pond & swap adjustment factor .... Fp = 0.87 <br />9. Peak Discharge,gp ...............cfs <br />= 40.0117 <br />Date: <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -74 <br />