2007-10-30_PERMIT FILE - C1982057 ‎(2)‎

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 10/30/2007
• Doc Name: As-Built Report Sedimentation Structure Pond 005
• Section_Exhibit Name: Tab 13 Attachment 13-3C
• Media Type: D
• Archive: No

Seneca II-W Mine
Pond 005
HYDROLOGIC INPUT PARAMETERS
SEDCAD4
WATERSHED ID
005-Lower
S2-SWS-1
Watershed Area:
43.3 acres
Curve Number:
WATERSHED VEGETATION HYDROLOGIC CURVE AREA
TYPE COVER SOIL GROUP NUMBER (acres)
Sagebrush Fair: 30-70% C 63 10.1
Mixed Brush Fair: 30-70% B 48 20.5
Mixed Brush Fair: 30-70% C 57 10.8
Disturbed Gravel Road C 89 1.8
Total 43.3
CURVE NUMBER: 66

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.
SEDCAD4
WATERSHED ID
005-Lower
S2-SWS-1
Watershed Area:
43.3
Sedimentology: k Factor
HYDROLOGIC AREA
SOIL TYPE SOIL GROUP k Factor (acres)
X8E, X8F - Winevada- B 0.25 16.15
2VD - Routt C 0.26 20.94
66D - Foidel B 0.25 4.37
Disturbed -Gravel Road C 0.16 1.8
Total 43.3
Weighted k Factor 0.37
•
Revised 08/07
TR-59 13-3C-A.18