2011-07-26_PERMIT FILE - C1982057 ‎(3)‎

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 7/26/2011
• Doc Name: Postmine Drainage Channel Design
• Section_Exhibit Name: Tab 20 Attachment 20-1
• Media Type: D
• Archive: No

•
Seneca II-W Mine
005 Gulch Postmine Channel Designs
HYDROLOGIC INPUT PARAMETERS
SEDCAD4
WATERSHED ID
005-E 1
S6-SWS-1
Watershed Area:
57.7 acres
Curve Number:
WATERSHED VEGETATION HYDROLOGIC CURVE AREA
TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair: 30-70% B 70 57.7
Total 57.7
CURVE NUMBER: 70
Curve number (CN) values used are approved Seneca II-W CN values (North Area; see Table 13-1).
Values were adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR-55),
Soil Conservation Service, 1986.

Revised 05/07
TR-59 20-1.12