2008-01-16_PERMIT FILE - C1994082A ‎(5)‎

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 1/16/2008
• Doc Name: YPM-9 to YPM-21, Dragline Deadhead Route Postmine Channel
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13.12.3 Part 2
• Media Type: D
• Archive: Yes

YOAST MINE
Postmine Channels -YPM-11
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 2 - SWS1
Watershed W-10 (YPM-10)
Watershed Area:
61.5
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Aspen/Mountain Brush Good (>70%) C 41 2.3
Reclaimed Fair (30%<x<70%) C 71 59.2
Total 61.5
CURVE NUMBER 70
Curve number (CN) values used are approved Yoast Mine values (see Table 13-12.1). Values
were adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR-55) ,
Soil Conservation Service, 1986.

J

TR-35 13-12.3-140 Revised 08/07