2008-01-16_PERMIT FILE - C1994082A ‎(3)‎

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 1/16/2008
• Doc Name: Post Mining Channels SEDCAD Results/Channel YPM-1 to YPM-8
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13.12.3
• Media Type: D
• Archive: Yes

Yoast Mine
Postmine Channel Design
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Channel YPM-2
Watershed ID -Structure 2 - SWS1
Watershed Area: 4.9
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 4.3
/Mountain Shrub
A Good (>70%) C 41 0.6
spen
Total 4.9
CURVE NUMBER 68
Approved Yoast Mine curve numbers are presented in Appendix 13-12, Postmining Drainage and Sediment
Control ,Table 13-12.1. Values were adapted from Urban Hydrology for Small Watersheds, Technical
Release No. 55, Soil Conservation Service, 1986.
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TR-36 13-12.3-16 Revised 08/07