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-1-3
Watershed ID -Structure 5 - SWS1
tershed Area: 9.5
West side subwatershed
rve Number:
WATERSHED TYPE VEGETATION COVER SOIL GROUP
Reclaimed Fair (30% - 70%) B
Good (>70%) C
Aspen/Mountain Shrub
Total
CURVE NUMBER
SEDCAD 4
Channel YPM-1-3
Watershed ID -Structure 5 - SWS2

,Natershed Area: 11.6
East side subwatershed
Curve Number:
WATERSHED TYPE VEGETATION COVER SOIL GROUP
Reclaimed Fair (30% - 70%) B
Good (>70%) C
Sagebrush
NUMBER
71
41
NUMBER
71
47
AREA
acres)
6.28
3.23
9.51
61
(acres)
10.50
1.10
11.60
~~
CURVE NUMBER 69
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.
•
TR-36 13-12.3-19
Revised 08/07