2008-12-04_PERMIT FILE - C1994082 ‎(10)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Pond 012 and Pond 012A Two-Pond System Design ‎(Pgs 13-12.1-149 to 13-12.1-225)‎
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1 Part 2
• Media Type: D
• Archive: No

•

f/ Yoast Mine
Pond O'12J0'12A System
~3YDROLOGIG INPUT PARAMETERS
SEDCAD 4
Channel YPM-5-1
Watershed ID -Structure 10 - SWS1
Watershed Area: 45.7
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYFE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 40.68
Aspen/Mountain Shrub Good (>70%) B 30 1.21
AspenlMountain Shrub Goad (>70%) D 48 0.99
h
b
S Good (>70%) D 55 2.77
age
rus
Total 45.7
CURVE NUMBER 68
SEDCAD 4
Channel YPM-5-1A
~-
Watershed ID -Structure 10 -SWS2
Watershed Area: 7.2
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYFE VEGETATION COVER SOIL GROUP NUMBER (acres)
d
i Fair (30% - 70%) B 71 7.24
me
Recla
Total 7.2
CURVE NUMBER 71
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, 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
Watershed ID -Structure 10 -SWS2
Sedimentology: k factor
SERIES GROUP k FACTOR (acres)
Reclaimed B 0.32 40.68
11 CID - Binco clay loam D 0.24 3.8
B 0.28 1.2
66D1ElF - Foidel loam
Total 45.7
Weighted k Factor 0.31
•
TR-37
13-12.1-190
Revised 08108