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
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Channel PM-1 System
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Channel PM-1C
Watershed ID -Structure 4 - SWS1
Watershed Area:
4.3
Curve Number: Postmine Conditions
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Good (>70%) C 71 4.3
Total 4.3
CURVE NUMBER 71
Approved II-W Mine curve numbers are presented in Appendix 13-5B, 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.
TR-59
20-1.143A
Revised 08/07