2001-12-11_PERMIT FILE - C1981019 ‎(2)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 07 Item 04 DRAINAGE PLAN FOR COLOWYO COAL CO WORK AREA TIPTON AND KALMBACH INC 1979
• Media Type: D
• Archive: No

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Table 5
Culverts M lhru R
" a~~
Ilem i

Culvert Designation M "~ ~
~u~ / ~
Location Haul H
Road R
Drainage Area (acres) 63.5 6~.i to.~
Design Category Mining Mining Mining
Duration Duration Duration
Design Precipitation Frequency (years) 10 10 10
Runoff coefficient 0.47 0.47 0.43
Rainfall Intensity (in/hr) 0.77 0.77 0.77
Average Drainage Slope (%) 20.2 19.8 12.4
Required Copacity (cfs) 29.0 29.6 8.3
Installed Pipe
Diameter (inches)
Approx. Slope (%)
Capacity(1) (cfs)
Velocity(1) (ft~sec)
(1) Witli culvert flowing full
Iverts
p Q R
Haul Gossard Lood
Road Loadout (2) Out
20.7 79.7 1.8
Mining Mining Mining
Duration Durotion Duration
10 10 10
0.44 0.42 0.52
0.77 0.77 0.77
11.6 1.2 5.0
10.0 17.6 1.4
36 48 24 18 30 30
0.7 0.5 0.5 1.2 1.0 0.9
48 85 14 10 36 36
6.8 6.7 4.5 5.6 7.:5 7.3
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