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Freeboard: 0.28 feet <br />DITCH C -4 <br />Time of Concentration (SCS Method) <br />Curve Number: 81 <br />Length of Flow (ft): 4924.62 <br />Average Land Slope (percent): 7.8 <br />Time of Concentration (hrs): 0.66 <br />DITCH C -4 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL <br />Location: DITCH C -4 Checked <br />Present <br />1. Data: <br />Drainage area: .................... A = 99.2000 Acres <br />Runoff Curve Number: ............. CN = 81 <br />Time of Concentration: ........... Tc = 0.66 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />Date: 02/16/06 <br />Date: <br />throughout watershed ............... = 1.00 percent of A <br />0.9920 Acres <br />2. Frequency ........................yr <br />= 10 <br />3. Rainfall,P(24- hour) .............. in = 2.00 <br />4. Initial abstraction, la............ = 0.4691 <br />5. Compute la /P ....................... = 0.2346 <br />6. Unit peak discharge, qu <br />...... csm /in = 405.21 <br />7. Runoff ,Q .........................in = 0.6045 <br />8. Pond & swap adjustment factor .... Fp = 0.87 <br />Revised June 2011 JR -60) Attachment 2.05.3(3) -1 -13 <br />