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 Design
HYDROLOGIC INPUT PARAMETERS
SEDCAD4
WATERSHED ID
005-W1
S7-SWS-1
Watershed Area:
13.8 acres
Curve Number:
WATERSHED VEGETATION HYDROLOGIC CURVE AREA
TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair: 30-70% B 70 2.3
Mixed Brush Fair: 30-70% B 48 8.2
Mixed Brush Fair: 30-70% C 57 3.3
Total 13.8
CURVE NUMBER: 54
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-55J,
Soil Conservation Service, 1986.
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Revised 08/07
TR-59 20-1.13