2010-10-07_PERMIT FILE - C1994082 ‎(2)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 10/7/2010
• Doc Name: YPM-9 to YPM-24, Dragline Deadhead Route Postmine Channel
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.3 Part 2
• Media Type: D
• Archive: No

•

•
/ YOAST MINE
~~~/// Postmine Channel Designs -Channel YPM-11
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Structure 9 - SWS1
Watershed -Channel YPM-21A
Watershed Area: 7.6
Curve Number:
HYDROLOGIC CURVE
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER AREA (acres)
Fair (30% - 70%) B 71 7.6
Reclaimed
Total 7.6
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 Smad Watersheds, Technical Release No. 55, Soil Conservation
Service, 1986.
Revised 02/08
TR-37
13-12.3-141 G