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TABLE 12-6 (CONTINUED) <br />CULVERT SPECIFICATIONSs <br />SENECA II MINE <br />Drainage Peak Culvert3 Culvert <br />Location' Area Runoff2 Diameter Length <br />IAcresl Icfsl Ilnchesl IFeetl <br /> <br />Minimum° <br />Cover <br />Ilnchesl <br /> <br /> <br />esign <br />Method . <br />60a 9.4 4.9 24 60 12 SEDCAD + <br />62a 66.9 17.82 24 150 12 SEDCAD+ <br />63a 18.3 8.2 24 150 12 SEDCAD+ <br />64a 0.7 0.6 24 20 12 SEDCAD+ <br />65b 17.5 10.7 24 80 12 SEDCAD+ <br />Al 12.2 0.9 24 30 12 SEDCAD+ <br />A2 2.3 0.2 12 30 12 SEDCAD+ <br />A3 154.4 5.4 30 30 12 SEDCAD+ <br />A4 7.8 0.6 12 47 12 SEDCAD+ <br />A5 46.4 11.2 30 48 12 SEDCAD+ <br />A7 384.1 22.2 42 26 12 SEDCAD + <br />A8 11.7 0.9 24 20 12 SEDCAD+ <br />'An "a" suffix indicates existing culver t; a "b" suffix indicates proposed culvert. See Exhibit 7-7 for <br />locations. <br />~"Procedures for determining peak flows in Colorado -incorporates and supplements Technical Release <br />No. 55 Urban Hydrology for Small Wate rsheds"; SCS, U.S. Department of Agricultur e, March 1980. <br />a"Hydraulic Charts for the Selection of Highway Culverts", Hydrau lic Engineeri ng Circular No. 5, <br />reprinted June 1980 and Dodson & Associates, Inc., Pipe Culvert Analysis. Minimum diameter <br />required. <br />°American Iron and Steel Institute, "Handbook of Steel Drainage and H ighway Construction Products", <br />1980 (Minimum Thickness = 16 gage) <br />SCulverts replaced as of October 2, 198 9. <br />I <br />6Postmine culvert demonstrations are presented in Appendix 7-12, Postmine Drainage Control. Culvert <br />locations are shown on Exhibit 7-19, Postmining Drainage Control and Exhibit 13-2A, Postmining <br />Topography and Permanent Features. <br /> • <br />TR-37 12-33 Revised 04/05 <br />