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-E1
S6-SWS-1
Watershed Area:
57.7 acres
Curve Number:
WATERSHED VEGETATION HYDROLOGIC CURVE AREA
TYPE COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair: 30-70% B 70 57.7
Total 57'7
CURVE NUMBER: 70
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-E1
S6-SWS-1
Watershed Area:
57.7
Sedimentology: k Factor and Control Factor
VEGETATION HYDROLOGIC k CONTROL AREA
WATERSHED TYPE COVER SOIL GROUP FACTOR FACTOR (acres)

Reclaimed Fair: 30 - 70% B 0.16 0.043 57.7
Total 57'7
0.16 0.043
The soil erodibility factor, "k-Factor", values were determined based on Seneca II-W soil survey information (see Table
13-2). The values were taken from Soils of Colorado, Loss Factors and Erodibility, Soil Conservation Service, 1983.
The Control Factor values were adapted from Attachment 13-5B, Drainage and Sediment Control Plan. The values
were taken from Renard, et al. (1996) Predicting Soil Erosion by Water.' A Guide to Converation Planning with the
Revised Universal Soil Loss Equation (RUBLE) .Agricultural Handbook 703. U.S. Department of Agriculture. R2VISed 05/07
TR-59 13-3-A.27