2008-12-04_PERMIT FILE - C1994082 ‎(15)‎

• 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 13-19.1 Appendix 13-19.1-A
• Media Type: D
• Archive: No

Yoast Mine
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Pond 011A Storage Capacity Demonstration
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Channel YPM-9
Watershed ID -Structure 1 - SWS1
Watershed Area: 17.2
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 17.2
Total 17.2
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-9
Watershed ID -Structure 1 - SWS1
Sedimentology: k factor

SOILS MAP UNIT/SOILS SERIES HYDROLOGIC SOIL
GROUP
k FACTOR AREA
(acres)
Reclaimed B 0.32 17.2
Total 17.2
Weighted k Factor 0.32
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.
SEDCAD4
Channel YPM-9
Watershed ID -Structure 1 - SWS1
Sedimentology: Control Factor

LAND USE CONDITION
COVER TYPE
VEGETATION CONTROL
FACTOR AREA
(acres)
Reclaimed Reclaimed 60% ground cover 0.042 17.2
Total 17.2
Weighted Control Factor 0.042
The Control Factor values are approved Yoast Mine values as presented in Attachment 13-12, Table 13-12.3. The
values were originally presented in Renard, et al. (1997) Predicting Soil Erosion by Water: A Guide to
Converation Planning with the Revised Universal Soil Loss Equation (RUBLE), Agricultural Handbook 703, U.S.
Department of Agriculture as reported in Warner et al. (1998) as reported in Warner et al. (1998).
TR-37 13-19.1-A.11 Revised 08/08