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

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TR-59
SENECA II-W
Channel PM-2 System
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
Channel PM-2B
Watershed ID -Structure 3 - SWS1
Watershed Area:
33.4
Curve Number: Postmine Conditions
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Good (>70%) C 71 2.68
Aspen/Mountain Shrub Good (>70%) B 30 30.70
Total 33.38
CURVE NUMBER 33
SEDCAD 4
Channel PM-2B
Watershed ID -Structure 3 - SWS2
Watershed Area:
23.7
Curve Number: Postmine Conditions
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Good (>70%) C 71 23.65
Total 23.65
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.
20-1.163
Revised 05/07