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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 <br />By: GL Date: 02/16/06 <br />Location: DITCH C -4 <br />Checked: Date: <br />Present <br />1. Data: <br />Drainage area: .................... <br />A = 99.2000 Acres <br />Runoff Curve Number: ............. <br />CN = 81 <br />Time of Concentration: ........... <br />Tc = 0.66 <br />Storm Type: ....................... <br />=11 <br />Pond and swamp areas spread <br />throughout watershed ............... <br />= 1.00 percent of A <br />0.9920 Acres <br />2. Frequency ........................yr <br />= 10 <br />3. Rainfall ,P(24 - hour) .............. <br />in = 2.00 <br />4. Initial abstraction, la............ <br />= 0.4691 <br />5. Compute la /P ....................... <br />= 0.2346 <br />6. Unit peak discharge, qu ...... <br />csm/in = 405.21 <br />7. Runoff, Q .........................in <br />= 0.6045 <br />8. Pond & swap adjustment factor .... Fp = 0.87 <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -13 <br />