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"Worst Case 15 (WC15): The worst case drainage area that feeds into Pond 015. This area is shown on <br />Map 2.05.3(3) -15 and the details of the drainage and pond are in Attachment 2.05.3(3)0 -15. <br />tDitches C28 through C33 will be built during reclamation as part of post mine drainage control. These can <br />be seen on Map 2.05.3(3) -1 -2 <br />Ditch C20 will have lining of D50 of 8" size for 20' length on either side of Culvert 112. The remainder of this <br />ditch will have no lining. <br />The following pages show the detailed calculations for all ditches. <br />3. DITCH DESIGNS <br />DITCH C -1 <br />Time of Concentration (SCS Method) <br />Curve Number: 86 <br />Length of Flow (ft): 2610.41 <br />Average Land Slope (percent): 9 <br />Time of Concentration (hrs): 0.31 <br />Graphical Peak Discharge <br />Project: NUCLA MINE By: GL <br />Location: DITCH C -1 Checked <br />Developed <br />1. Data: <br />Drainage area: .................... A = 25.7000 Acres <br />Runoff Curve Number: ............. CN = 81 <br />Time of Concentration: ........... Tc = 0.31 <br />Storm Type: ....................... = II <br />Pond and swamp areas spread <br />Date: 02/16/06 <br />Date: <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -9 <br />