2023-02-21_PERMIT FILE - C1981019 ‎(19)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 2/21/2023
• Doc Name: Section 16 Pond Temporary and Permanent Channels
• Section_Exhibit Name: Exhibit 07 Item 14 Appendix Exh7-14S
• Media Type: D
• Archive: No

Page Exh. 7-14S-3 Revision Date: 12/13/22
Revision No.: TR-158
The West Section 16 Ditch from station 0+00 to 45+00 is trapezoidal in cross section
with a 2 foot bottom width, left side slope ratio of 1H:1V, a right side slopes ratio of
7H:1V, and depth of at least 0.5 feet. This segment is a vegetated channel.

The West Section 16 Ditch from station 45+00 to 63+57 is trapezoidal in cross section
with a 10 foot bottom width, left side slope ratio of 4H:1V, right side slope ratio of
2H:1V, and a depth of at least 1.0 feet. This segment of the ditch is a vegetated channel.

The location of the East and West Section 16 Ditches can be found on Map 12.

Permanent Channels

The Section 16 Pond watershed is comprised of two post-mining channels. The locations
of these channels are presented on Map 12 and Figure Exh. 7-14S3-2, and the channel
profiles are presented on Map 33.

Trib A and B will be constructed in reclamation areas adjacent to the South Taylor Pit
and the Section 16 reclamation areas. Originally, these channels were modeled in
accordance with Rule 4.05.3(3) for the 10-year 24 hour event. However, the post-mining
watershed contributing to the channels are so small that SEDCADTM cannot calculate
actual flows when inputted into the model, and errors are noted for insufficient flows.
Therefore, there are not any SEDCADTM outputs contained in this append for Trib’s A
and B.

The design configuration for all both channels are as follows:

Trib A and B
Name
Peak
Flow
(CFS)
Average
Slope
(%)
Channel Type Side
Slopes
Total
Depth
Erosion
Protection
Trib A NA 16.3 Trapezoidal 6’
bottom 2H:1V 3’ Riprap,
D50 = 12”
Trib B NA 12.8 Trapezoidal
12’ bottom 2H:1V 4’ Riprap,
D50 = 12”
Trib D NA 7.9 Trapezoidal
12’ bottom 2H:1V 4’ Riprap,
D50 = 12”