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CULVERT 107 <br />Peak flow of 10.7 cfs from Ditch D -108. See Ditch design for details. <br />CULVERT 108 <br />Peak flow of 18.2 cfs from Ditch D -109. See Ditch design for details. <br />CULVERT 109 <br />Time of Concentration (SCS Method) <br />Curve Number: 78 <br />Length of Flow (ft): 867.19 <br />Average Land Slope (percent): 7.38 <br />Time of Concentration (hrs): 0.18 <br />CULVERT 109 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL <br />Location: CULVERT 109 Checked <br />Present <br />1. Data: <br />Drainage area: .................... A = 10.1000 Acres <br />Runoff Curve Number: ............. CN = 78 <br />Time of Concentration: ........... Tc = 0.18 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />2/18/2006 12:54 <br />Date: 02/18/06 <br />throughout watershed ............... = 3.00 percent of A <br />0.3030 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 = 746.29 <br />Date: <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -75 <br />