2011-07-01_PERMIT FILE - C1982057A ‎(6)‎

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 7/1/2011
• Doc Name: Postmine Drainage Channel Design
• Section_Exhibit Name: Tab 20 Attachment 20-1
• Media Type: D
• Archive: Yes

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Seneca II-W Mine
005 Gulch Postmine Channel Design
HYDROLOGIC INPUT PARAMETERS
SEDCAD4
WATERSHED ID
005-E2
S4-SWS-1
Watershed Area:
8.5 acres
Curve Number:
WATERSHED VEGETATION HYDROLOGIC CURVE AREA
TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair: 30-70% B 70 6.3
Sagebrush Fair: 30-70% B 51 2.2
Total 8.5
CURVE NUMBER: 65
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 20-1.10