2008-12-04_PERMIT FILE - C1994082 ‎(35)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Sediment Ponds SEDCAD4 Results
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1
• Media Type: D
• Archive: No

Yoast dine
Pond 012A Design
HYDROLOGIC INPUT PARAi',iIETERS

•
SEDCAD 4
Channel YPM-5-1
OPTION 2
Watershed ID -Structure 10 - SWS1
Watershed Area: 45.7
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 40.68
Aspen/Mountain Shrub Good (>70%) B 30 1.21
Aspen/Mountain Shrub Good (>70%) D 48 0.99
Good (>70%) p 55 2.77
Sagebrush
Total 45.7
CURVE NUMBER 68
SEDCAD 4
Channel YPM-5-1A
OPTION 2
Watershed ID - StruC.ure 10 -SWS2
Watershed Area: 7.2
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
d Fair (30% - 70°I°) B 71 7.24
Reclaime
Total 7.2
CURVE NUMBER 71
Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation
Baseline Reporf, Yoast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are
presented in Attachment 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.
SEDCAD 4
Channel YPM-5-1A
OPTION 2
Watershed ID -Structure 10 -SWS2
Sedimentology: k factor
SERIES GROUP k FACTOR (acres)
Reclaimed 8 0.32 40.68
11 CID - Binco clay loam D 0.24 3.8
B 0.28 1.2
66D/E/F - Foidel loam
Total 45.7
Weighted k Factor 0.31
•
TR-37
13-12.1-78B
Revised 02/08