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PERMFILE116404
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PERMFILE116404
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Last modified
8/24/2016 10:12:15 PM
Creation date
11/25/2007 2:14:06 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981029
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
APPENDIX 2.05.3-11 DITCH CALCULATION BACKFILLED MINE AREA SUN COAL CO MEADOWS 1 ROUTT CNTY COLO
Media Type
D
Archive
No
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APPENDIX 2.05.3-11A <br />• DITCH CALCULATIONS <br />OUTFLOW FROM NORTHWEST SEDIMENT TRAP <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />Ditch Calculation - Meadows No. 1 Sediment Trap - refer to Map 19 <br />Peak flow 9.3 cfs <br />Parabolic channel <br />Hydraulic Radius = 2~ Y~ 2 <br />Y <br />Assume: T = Top Width <br />y = Depth <br />Calculate where T = 6' <br />y = 6" or .5' <br />R = 2(6)2 (.5) __ 36 = .33 <br />3(6)~ (108) + 2 <br />• Area A = ~ Ty = ~ (6) .5 <br />Mannings Roughness (n) _ .033 <br />Slope (S) _ .07 Q = 1n49 (A)(R) 3 S <br />Discharge (Q) = 1.4g (2)(.33) ? .07 <br />.033 3 <br />Q = (2)(.5)(.26) <br />Q = 11.74 cfs (ditch too large) <br />Assume T = 4' wide, 6" deep <br />Area = 3 Ty ~. (4).5 = 1.33 <br />R = .27 <br />• <br />- 308 - (Rev. 5/86) <br />
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