2010-05-07_PERMIT FILE - C2009087 ‎(31)‎

• Permit No: C2009087
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: 10 Year, 24 Hour SEDCAD4 Modeling
• Section_Exhibit Name: Exhibit 2.05.3-E2 Appendix 2.05.3-E2.C Addendum 2.05.3-E2.C-1
• Media Type: D
• Archive: No

•
TR -51
Seneca II Mine
Pond 004
HYDROLOGIC INPUT PARAMETERS
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.
SEDCAD4
SEDCAD 4
WATERSHED ID
WATERSHED ID
Structure 3 - SWS -1
Structure 3 - SWS -1
Subwatershed - Channel PM -17 Lower
Subwatershed - Channel PM -17 Lower
Watershed Area:
15.6
Curve Number:
VEGETATION
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE
GROUND COVER
SOIL GROUP
NUMBER
(acres)
Reclaim >3 years
Good ( >70 %)
B
62
15.60
Total
0.043
15.6
Total
15.6
CURVE NUMBER
62
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.
SEDCAD4
WATERSHED ID
Structure 3 - SWS -1
Subwatershed - Channel PM -17 Lower
Watershed Area:
15.6
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
15.6
Total
j
15.6
0.16
0.043
The soil erodibility factor, "k- Factor", values were determined based on Seneca II soil survey information (see Tab 9, Exhibit 9-
1, Soil Type and Sampling Locations, and Attachment 9 -6) as presented in Sods of Colorado, Loss Factors and Erombdvty,
Soil Conservation Service, 1983.
The Control Factor values were adapted from the Yoast and Seneca II -W permit application packages. These values are
presented in each permit in the Drainage and Sediment Control Plan attachment, which is located in Tab 13 of the respective
permit documents. The values are based on Renard, et al. (Renard, K.G., Foster, G.R., Weesies, G.A., McCool, D.K., and
D.C. Yoder, coordinators, 1996. Predicting Soil Erosion by Water A Guide to Converation Planning with the Revised
Universal Soil Loss Equation (RUSLE) . Agricultural Handbook 703. U.S. Department of Agriculture.
2.05.3 -E2.0 -1.21
Rq� 50 09/09