2010-05-07_PERMIT FILE - C2009087 ‎(56)‎

• Permit No: C2009087
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: Portal Area Sump 10 Year, 24 Hour Storm Event Runoff Calculations
• Section_Exhibit Name: Exhibit 2.05.3-E2 Appendix 2.05.3-E2.F Addendum 2.05.3-E2.F-1
• Media Type: D
• Archive: No

Peabody Sage Creek Mine
• Portal Area Sumps
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 3
Mine Water Discharge
Operational Conditions Design
Watershed Area:
n/a
Curve Number:
HYDROLOGIC SOIL
CURVE
AREA
WATERSHED TYPE
GROUND COVER
GROUP
NUMBER
(acres)
Inflow
n/a
n/a
na/
n/a
Total
1
1 1
1 n/a
Mine Discharge is the perennial discharge from the pond. The average flow rate for the PECOCO
discharge is 40 gpm (0.15 ac- ft/day). The permanent pool elevation for PECOCO was set at
6775.65 feet as a model input value to account for the constant spoil spring inflow.
CURVE NUMBER n/a
Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the Seneca
II Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming Drainage
Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55), Soil
Conservation Service, 1986.
•
•
2.05.3 -E2.F -1.13 12/09