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CULVERT 111 <br />Time of Concentration (SCS Method) <br />Curve Number: 79 <br />Length of Flow (ft): 1803.22 <br />Average Land Slope (percent): 7.9 <br />Time of Concentration (hrs): 0.31 <br />CULVERT 111 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL Date: 02/19/06 <br />Location: CULVERT 111 Checked: Date: <br />Present <br />1. Data: <br />Drainage area: .................... A = 49.3000 Acres <br />Runoff Curve Number: ............. CN = 79 <br />Time of Concentration: ........... Tc = 0.31 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 1.00 percent of A <br />0.4930 Acres <br />2. Frequency ........................yr = 10 <br />3. Rainfall,P(24- hour) .............. <br />in = 2.00 <br />4. Initial abstraction, la............ = 0.5316 <br />5. Compute la /P ....................... <br />= 0.2658 <br />6. Unit peak discharge, qu ...... <br />csm /in = 590.63 <br />7. Runoff ,Q .........................in <br />= 0.5225 <br />8. Pond & swap adjustment <br />factor .... Fp = 0.87 <br />9. Peak Discharge,gp ...............cfs <br />= 20.6812 <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -77 <br />