PERMFILE131211

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 1/11/2007
• Doc Name: Pond 016 Spillway Certifiation
• Section_Exhibit Name: Tab 13 Attachment 13-5F Appendix 1
• Media Type: D
• Archive: Yes

. SENECA II West Coal Mine
Pond 016 System
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 3 -SWS4
Watershed ID:
S3-SWS4
Watershed Area:
Curve Number:
34.0 acres
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Sa ebrush Good >70%} C 47 4.7
As en/Mountain Brush Good{>70%) C 41 29.3
Total 34.0
CURVE NUMBER 42
Soil Erodability Factor (K):
SOIL TYPE AREA (acres) K FACTOR K*AREA
Winevada-Splitro
Complex
8.7
0.37
3.2
Routt Cla 11.9 0.28 3.3
Binco Cla Loam 1.3 0.2B 0.4
Coutis Slit Loam 10.4 0.37 3.8
Aaber Cla 1.3 0.28 0.4
Foidel Silt Loam 0.4 0.28 0.1
34.0
Wei hted K Factor 0.20
Control Factor:

SOIL TYPE AREA (acres) C FACTOR C*AREA
Sa ebrush 4.7 0.042 0.2
Aspen/Mountain Brush 29.3 0.042 1.2
34.0
Wei
hted CP Factor
0.042
Practice Factor:
SOIL TYPE AREA (acres) P FACTOR P*AREA
Undisturbed 34.0 1 34.0
Weighted CP Factor 1.OD
TR-56 13-5F-A.25 Revised 09/06