2008-12-04_PERMIT FILE - C1994082 ‎(7)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: 10 Year 24 Hour SEDCAD Demonstration
• Section_Exhibit Name: Tab 13 Attachment 13-4A.1 Appendix 13-4A.1-A
• Media Type: D
• Archive: No

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•
Yoas# Nline
panel ~'f 1 Permanent Feattare Demonstra#ion
HYDROLOGIC INPUT PA'RAI'nSTERS
SEDCAD 4
Channel YPM-12
Watershed ID -Structure 4 - SWS1
Watershed Area: 91.2
Curve Number:

WATERSHED TYPE VEGETATION
COVER HYDROLOGIC
SOIL GROUP CURVE
NUMBER AREA
(acres)
Reclaimed
Aspen/Mountain Brush

Aspen/Mountain Brush
Aspen/Mountain Brush
Steep Mtn. Brush
Steep Mtn. Brush
Sagebrush
Sagebrush
Sagebrush Fair (30% - 70%)
Fair (30% - 70%)
Fair 30% - 70%
( )
Fair (30% - 70%)
Fair (0% - 70%)
Fair (0% - 70%)
Fair (30% - 70%)
Fair (30% - 70%)
Fair (30% - 70%)
Fair (30% - 70%) B
B
C

p
C
D
B
C
D
D 71
48
57

63
77
83
51
63
70
89 3.6
57.9

13.1

3.3
3.9

7.2
2.2
W. WheatgrasslAlkali Sagebrush Total 91'2
CURVE NUMBER 55
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-12
Watershed ID -Structure 4 - SWS1
Sedimentology: k factor
AREA
HYDROLOGIC SOIL
SOILS MAP UNIT/SOILS SERIES GROUP k FACTOR (acres)
B 0.32 3.6
Reclaimed B 0.37 55.7
XBD/E/F - Winevada - Splitro complex 2
0
11 C - Binco clay loam D 0.24
28
0 .
4.5
27D -Silas loam B
B .
0.37 1.8
34C/D/E/F - Coutis silt loam 7
23
103 - Ustorthents-Cryoborolls complex D 0.20 .
91.3
Total
Weighted k Factor 0.24
Soils series information from Yoast Mine Permit Application Package (see Tab 9, Soil Baseline Study [Nyenhuis,
. 1994]). Hydrologic Soil Group values are approved Yoast values {see Attachment 13-12, Table 13-12.2). The soil
erodibility factor, "k-Factor", values are presented in Attachment 13-12, Table 13-12.2.
TR-37 13-4A.1-A.19 Revised 02/08