2010-05-07_PERMIT FILE - C2009087 ‎(59)‎

• Permit No: C2009087
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: Post Mine Ditch and Culvert Designs pgs TOC to 155
• Section_Exhibit Name: Exhibit 2.05.3-E2 Appendix 2.05.3-E2.H-1
• Media Type: D
• Archive: No

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Peabody Sage Creek Mine
PM -1 System Channel Designs
HYDROLOGIC INPUT PARAMETERS
Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the
Seneca II Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming
Drainage Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55),
• Soil Conservation Service, 1986.
•
Revised 12/09
2.05.3- E2 -H.43
SEDCAD4
WATERSHED ID
Structure 19 - SWS1
Channel PM -23
Watershed Area:
14.4
Curve Number:
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE
GROUND COVER
SOIL GROUP
NUMBER
(acres)
Sagebrush
Fair (30 - 70 %)
C
63
4.0
Reclaim >3 years
Good ( >70 %)
B
62
10.40
Total
14.4
CURVE NUMBER
62
Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the
Seneca II Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming
Drainage Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55),
• Soil Conservation Service, 1986.
•
Revised 12/09
2.05.3- E2 -H.43