2007-10-30_PERMIT FILE - C1982057A

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 10/30/2007
• Section_Exhibit Name: Tab 20 Attachment 20-1 Part 2
• Media Type: D
• Archive: Yes

SENECA II-W
Channel PM-2 System
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Channel PM-2C
Watershed ID -Structure 2 - SWS1
Watershed Area:
26.8
Curve Number: Postmine Conditions
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Good (>70o/u) C 71 26.80
Total 26.80
CURVE NUMBER 71
Approved II-W Mine curve numbers are presented in Appendix 13-56, Postmining Drainage and
Sediment Control, Table 1, Seneca II-W (South Expansion Area) Curve Numbers. Values were
adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation
Service, 1986.
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TR-59 20-1.162 Revised 05/07