2013-04-04_HYDROLOGY - C1981012 ‎(2)‎

• Permit No: C1981012
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/4/2013
• Doc Name: 2012 Annual Sedimentation Pond Inspection Report
• From: New Elk Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: LDS
• Email Name: DIH
• Media Type: D
• Archive: No

1 1995 Survey
2 1981 Survey
3 1985 As -Built
4 1984 As -Built
5 Design Depth of 0.5 PMP Storm
Q 1
TABLE 23
SEDIMENT POND DIMENSIONS
005
Pond No.
DDT
Elevation of Upstream
Toe (Ft) 7,446.00 7,450.0 7,370.0 7,428
Elevation of 3 Year
Sediment Volume (Ft) 7,448.03 7,453.0 7,371.3 7,438
Elevation of 10 year
24 Hour Event (Ft) 7,449.95 7,456.0 7,378.2 7,451.75
Elevation of Emergency
Spillway (Ft) 7,451.20 7,457.0 7,379.5 7,452.75
Elevation of Top of
Structure (Ft) 7,452.00 7,459.0 7,381.5 7,459
Elevation of Peak 25 -year
24 -hour Storm Flowing
at Design Depth 7,450.06 7,458.0 7,380.5 7,455.8
Freeboard (Ft) Between
Dam Crest and 25 -year
24 -Hour Storm Flowing at
Design Depth 1.94 1.00 1.00 3.25
Width - Top of
Structure (Ft) 8' 12.0 12.0 15
Upstream Slope
of Embankment 1V:3.6H 1V:211 1V:2H 1V:3H
Downstream Slope
of Embankment 1V:3.8H 1V:3H 1V:3H 1V:2.5H
Elevation of Top of
Primary Riser 7,450.57 7,378.5 7,451.75
Note: Calculations for Ponds 004, 005, and 007 are shown in
Exhibit 19. Design for Pond 008 are provided in Exhibit 20.
Pond 006 is now a process pond.
2.05 -16 (revised 8/29/97)