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<br /> <br />_~ <br />Drainage <br />Area <br />1 <br />Location (Acres) <br />Culvert Specifications (Continued) <br />Seneca !I Mine, Routt County, Colorado <br />3 <br />2 Culvert <br />Peak Runoff Diameter <br />010 (cfs) (Inches) <br />4 <br />Culvert Minimum <br />Length Cover Design <br />(feet) (Inches) Method <br />54a 4.1 0.3 18 28 12 SEDCAD+ <br />SSa 1.5 0.9 18 60 12 SEDCAD+ <br />56a 0.8 0.5 18 20 12 SEDCAD+ <br />57a 6.7 2.1 18 40 12 SEDCAD+ <br />SBa 7.5 4.6 24 80 12 SEDCADr <br />59a 16.5 4.0 18 20 12 SEDCAD+ <br />60a 9.4 4.9 24 60 12 SEDCAD+ <br />61a 20.7 12.7 24 80 12 SEDCAD+ <br />626 52.9 11.3 24 150 12 SEDCAD+ <br />63b 18.3 8.2 24 150 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 />AS 46.4 11.2 30 48 12 SEDCAD+ <br />A6 249.4 20.8 30 48 12 SEDCAD+ <br />A7 384.1 22.2 42 26 12 SEDCAD+ <br />AB 11.7 0.9 24 20 12 SEDCAD+ <br />1An "e" suffix indicates existing culvert; a "b" suffix indicates proposed <br />culvert. See Exhibit 7-7 for locations. <br />2"Procedures for determining peek flows in Colorado - incorporates and <br />supplements Technical Release No. 55 Urban Hydrology for Small Yatersheds"; <br />SC S, U.S. Department of Agriculture, March 1980. <br />3"Hydraulic Charts for the Selection of Highway Culverts", Hydraulic <br />Engineering Circular Mo. 5, reprinted June 1980 and Dodson 8 Associates, <br />Inc., Pipe Culvert Analysis. Minimum diameter required. <br />4American Iron and Steel Institute, "Handbook of Steel Drainage end Highway <br />Construction Products", 1980 (Minimum Thickness = 16 gage) <br />SCulverts replaced es of October 2, 1989. <br />12-2-2 Revised 10/12/92 <br />