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DITCH D109 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 2099.71 <br />Average Land Slope (percent): 7.5 <br />Time of Concentration (hrs): 0.37 <br />DITCH D109 <br />Graphical Peak Discharge <br />Project: NUCLA MINE <br />By: GL Date: 02/17/06 <br />Location: DITCH D109 <br />Checked: Date: <br />Developed <br />1. Data: <br />Drainage area: .................... <br />A = 52.0000 Acres <br />Runoff Curve Number: ............. <br />CN = 78 <br />Time of Concentration: ........... <br />Tc = 0.37 <br />Storm Type: ....................... <br />=11 <br />Pond and swamp areas spread <br />throughout watershed ............... <br />= 1.00 percent of A <br />0.5200 Acres <br />2. Frequency ........................yr <br />= 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 = 531.47 <br />7. Runoff, Q .........................in <br />= 0.4844 <br />8. Pond & swap adjustment <br />factor .... Fp = 0.87 <br />9. Peak Discharge,gp ...............cfs <br />= 18.1980 <br />Revised August 2009(PB06) Attachment 2.05.3(3) -1 -52 <br />