2009-10-06_PERMIT FILE - C1980005 ‎(12)‎

• Permit No: C1980005
• IBM Index Class Name: Permit File
• Doc Date: 10/6/2009
• Doc Name: 10 Year, 24 Hour SEDCAD4 Modeling
• Section_Exhibit Name: Tab 07 Appendix 7-6c.1 Addendum 7-6c.1A
• Media Type: D
• Archive: No

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Seneca II Mine
Pond 004
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 9 - SWS-4
Subwatershed - Pond 004 SWS4
Watershed Area:
3.2
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE GROUND COVER SOIL GROUP NUMBER (acres)
POND SURFACE n/a n/a 100 3.23
Total 3.2
CURVE NUMBER 100
Approved Seneca II Mine curve number (CN) values are presented in Appendix 7-12, Postiming Drainage
Control. Values were adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR-
55), Soil Conservation Service, 1986.
SEDCAD 4
WATERSHED ID
Structure 9 - SWS-1
Subwatershed - Pond 004 SWS-1
Watershed Area:
142.4
Sedimentology: k Factor and Control Factor
VEGETATION HYDROLOGIC k CONTROL AREA
WATERSHED TYPE COVER SOIL GROUP FACTOR FACTOR (acres)
Reclaimed Good (>70%) B 0.16 0.043 122.5
Sagebrush Fair D 0.37 0.042 19.96
Total 142.4
0.19 0.043
SEDCAD 4
WATERSHED ID
Structure 9 - SWS-2
Subwatershed - Pond 004 SWS-2
Watershed Area:
6.9
Sedimentology: k Factor and Control Factor
VEGETATION HYDROLOGIC k CONTROL AREA
WATERSHED TYPE COVER SOIL GROUP FACTOR FACTOR (acres)
Reclaimed Good (>70%) B 0.16 0.043 6.86
Total 6.9
0.16 0.043
TR-42
7-6c.1 A-26
Revised 09/07