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-6-3
Watershed I re 12 - SWS1
Watershed Area: 3.1
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
(30% - 70%)
i
F B 71 3.09
Reclaimed r
a
3.1
Total
CURVE NUMBER 71
SEDCAD 4
Channel YPM-6-3
Watershed ID -Structure 12 - SWS2
Watershed Area: 16.1
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 13.84
Good (>70%) D 48 2.27
Aspen/Mountain Shrub
Total 16.1
CURVE NUMBER 68
SEDCAD 4
Channel YPM-6-3
Watershed tD - ur SWS3
Watershed Area: 7.6
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%)
d (>70%)
G B
D 71
48 6.88
0.68
Aspen/Mountain Shrub
Total oo 7.6
CURVE NUMBER 69
•

Approved Yoast Mine curve numbers are presented in Appendix 13-12, Postmining Drainage and Sedimenl •
Control ,Table 13-12.1. Values were adapted from Urban Hydrology for Small Watersheds, Technical
Release No. 55, Soil Conservation Service, 1986.
TR-36 13-12.3-26 Revised 08!07