PERMFILE67869

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 7/15/2005
• Doc Name: As-Built Report Sedimentation Structure Pond 016A
• Section_Exhibit Name: Tab 13 Attachment 13-5F Appendix 2
• Media Type: D
• Archive: Yes

• SENECA II West Coal Mine
Pond 16 System
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 1 -SWS3
Watershed Id:
S1-SWS3
Watershed Area:
Curve Number:
73.8 acres
WATERSHED TYPE COVER SOIL GROUP NUMBER (acres)
Topsoil Stri ped None C 91 34.3
Aspen/Mountain Brush Good(>70%) B 30 39.5
Total 73.8
CURVE NUMBER 58
• Soil Erodability Factor (K):
SOIL TYPE AREA (acres) K FACTOR K'AREA
Pre-Stripped 34.3 0.16 5.48
Sk a Silt Loam 39.5 0.28 11.06
Weighted K Factor 0.22
Control Factor: - -
SOIL TYPE AREA (acres) C FACTOR C'AREA
Pre-Stripped 34.3 1 34:3
Aspen/Mountain Brush 39.5 0.042 1.7
Weighted C Factor 0.49
Practice Factor:
SOIL TYPE AREA (acres) P FACTOR P'AREA
Undisturbed 39.5 1.0 39.5
Disturbed -Topsoil
Stripped 34.3 0.9 30.9
Weighted P Factor 1.0