2008-12-04_PERMIT FILE - C1994082 ‎(20)‎

• 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 13-20.1 Appendix 13-20.1-A
• Media Type: D
• Archive: No

•
Yoast dine
Pond 013 Permanent Fea#ure Demonstration
HYDROLOGIC INPUT PARAh1ETERS
SEDCAD 4
Diversion 13A (Lower)
Watershed ID - Struc WS1
Nlatershed Area: 0.7
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Fair (30% - 70%) B 71 0.73
Reclaimed
Total 0.7
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 Releasa No. 55, Soil Conservation Service, 1986.
SEDCAD 4
Diversion 13A (Lower)
Watershed ID -Structure 3 - SWS1
Sedimentology: k factor
HYDROLOGIC SOIL AREA
SOILS MAP UNIT/SOILS SERIES GROUP k FACTOR
acres
(
B 0.32 0.73
Reclaimed
Total 0.7
Weighted k Factor 0.32
Sails 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
Diversion 13A (Lower)
Watershed ID -Structure 3 - SWS1
Sedimentology: Control Factor
CONTROL AREA
LAND USE CONDITION COVER TYPE VEGETATION FACTOR (acres)
Reclaimed 60% ground cover 0.042 0.73
Reclaimed
Total 0.7
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 13-20.1-A.15 Revised 02108