2010-10-07_PERMIT FILE - C1994082 ‎(2)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 10/7/2010
• Doc Name: YPM-9 to YPM-24, Dragline Deadhead Route Postmine Channel
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.3 Part 2
• Media Type: D
• Archive: No

YOAST ~i11NE
Fostmine Channel Designs -Channel YAM-11
HYDROLOGIC INPUT PARAINETERS
SEDCAD 4
Structure 6 - SWS1
Watershed W-8 (YPM-8)
Watershed Area: 27.1
Curve Number:
HYDROLOGIC SOIL CURVE
WATERSHED TYPE VEGETATION COVER GROUP NUMBER AREA (acres)
Aspen/Mcuntain Brush Geod (>70%) B 30 3.49
Aspen/Mountain Brush Good (>70%) C 41 0.33
laimed
R Fair (30% - 70%) B 71 23.3
ec Total 27'1
CURVE NUMBER 65
Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation Baseline
Report, Yoast Study Area (ESCO Associates, 1993}. Approved Yoast Mine curve numbers are presented in
Attachment 13-12, Posfmining Drainage and Sediment Control ,Table 13-12.1. Values were adapted from Urban
Hydrology for Small Watersheds, Technics! Release No. 55, Soil Conservation Service, 1986.
•
•
TR-37
13-12.3-141 D
Revised 02108