PERMFILE123522

• Permit No: C1980005
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: CULVERT CALCULATIONS
• Section_Exhibit Name: TAB 12 APPENDIX 12-2 PART 1
• Media Type: D
• Archive: No

Culvert Specif ioetions (Continued)
Seneca II Mine, Routt County, Colorado
3 4
Drainage 2 Culvert Culvert Minimum
7 Area Peak Runoff Diameter Length Cover Design
Location (Acres) 070 (cfs) (Inches) (feet) (Inches) Method
54a 4.1 0.3 18 28 12 SEDCAD*
SSe 1.5 0.9 18 60 12 SEDCAD+
56a 0.8 0.5 18 20 12 SEDCAD+
57a 6.7 2.1 18 40 12 SEDCAD+
SBa 7.5 4.6 24 80 12 SEDCAD+
59a 16.5 4.0 18 20 12 SEDCAD+
60a 9.4 4.9 24 60 12 SEDCAD+
62b 52.9 11.3 24 150 12 SEDCAD+
63b 18.3 8.2 24 150 12 SEDCAD+
64e 0.7 0.6 24 20 12 SEDCAD+
65b 17.5 10.7 24 80 12 SEDCAD+
Al 12.2 0.9 24 30 12 SEDCAD+
A2 2.3 0.2 12 30 12 SEDCAD+
A3 154.4 5.4 30 30 12 SEDCAD+
A4 7.8 0.6 12 47 12 SEDCAD+
AS 46.4 11.2 30 48 12 SEDCAD+
A6 249.4 20.8 30 48 12 SED[AD+
A7 384.1 22.2 42 26 12 SEDCAD+
A8 11.7 0.9 24 20 12 SEDCAD+
1An "a" suffix indicates existing culvert; a "b" suffix indicates proposed
culvert. See Exhibit 7-7 for locations.
2
"Procedures for determining peak flows in Colorado - incorporates end
supplements Technical Release Ho. 55 Urban Xydrology for Small Watersheds";
SCS, U.~S. Department of Agriculture, March 1980.
3"Xydraulic Charts for the Selection of Highway Culverts", Hydraulic
Engineering Circular No. 5, reprinted June 1980 and Dodson A Associates,
Inc., Pipe Culvert Anel ysis. Minimum diameter required.
4
American Iron and Steel Institute, "Xandbook of Steel Drainage end Highway
Construction Products", 1980 (Minimum Thickness = 76 page)
S[ulverts replaced as of October 2, 1989.
12-2-2 Revised 10/04/94