2008-12-04_PERMIT FILE - C1994082 ‎(23)‎

• 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 13-17.1 Appendix 13-17.1-A
• Media Type: D
• Archive: No

•

Yoast Mine
Pond 014 Permanent Feature Demonstration
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Pond 014
Watershed ID -Structure 6 - SWS1
Watershed Area: 2.0
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 2.02
Total 2.0
CURVE NUMBER 71
SEDCAD 4
Pond 014
Watershed ID -Structure 6 - SWS2
Watershed Area: 46.6
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 33.76
Aspen/Mountain Brush Fair (30% - 70%) B 48 11.3
Aspen/Mountain Brush Fair (30% - 70%) C 57 1.5
Total 46.6
CURVE NUMBER 65
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.
Pond 014
Watershed ID -Structure 6 - SWS1
Sedimentology: k factor

SOILS MAP UNIT/SOILS SERIES HYDROLOGIC SOIL
GROUP
k FACTOR AREA
(acres)
Reclaimed B 0.32 2.02
Total 2.0
Weighted k Factor 0.32
•
TR-37
13-17.1-A.18
Revised 02/08