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 If 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.
SEDCAD 4
SEDCAD 4
WATERSHED ID
WATERSHED ID
Structure 1 - SWS -1
Structure 1 - SWS -1
Subwatershed - Channel PM -17 Upper
Subwatershed - Channel PM -17 Upper
Watershed Area:
26.7
Curve Number:
VEGETATION
HYDROLOGIC
CURVE
AREA
WATERSHED TYPE
GROUND COVER
SOIL GROUP
NUMBER
(acres)
Reclaim >3 years
Good ( >70 %)
B
62.
26.70
Total
0 043
267
Total
26.7
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.
SEDCAD 4
WATERSHED ID
Structure 1 - SWS -1
Subwatershed - Channel PM -17 Upper
Watershed Area:
26.7
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
267
Total
26.7
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 Soils of Colorado, Loss Factors and Erodibility,
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 respect ;ve
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 -1.19
R ?uV 09/09