PERMFILE135058

• Permit No: C1980005
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: ROCK CHECK DAM DESIGN
• Section_Exhibit Name: TAB 13 APPENDIX 13-8
• Media Type: D
• Archive: No

No. 1 - No. 6 No. 15
Shape: V-shaped V-shaped
Side Slopes: 2H:1V 2H:1V and 4H:1V
Depth: 1 ft. 2.0 ft.
Length: 5 ft. to 10 ft. 7 ft.
Width: 25 ft. 40 ft.
Peak Flaw: 32.6 cfs 4.7 cfs
D50: 2.5 ft. 1.5 ft.
•
lExisting rock check dam No. 15 is depicted on Figure 13-8-1a and
located on Exhibit 7-7.
Peabody proposes to construct a series of rock check dams in the
reclaimed drainage channel above the Wadge Impoundment. The old
existing shale check dams have been removed and the incised reclaimed
channel bottom regraded. These rock check dams (No. 7 to No. 14) will
be constructed in this regraded channel (see Exhibit 7-7). Figure
13-8-2 shows the typical section for these check dams. Listed below is
a summary of the specifications of check dams No. 7 to No. 14.
Shape:
Side Slopes:
Depth:
Bottom Width:
Length:
Width
Peak Flow:
D50:
Construction
Trapezoidal
2H:1V
3.5 ft.
10 ft.
10 ft.
25 ft.
160.2-163.3 cfs
1.25 to 1.75 ft.
All existing and proposed rock check dams will be composed of double
riprap. To ensure that the rock used in the check dams will not
decompose and that it will remain durable, Peabody will test the rock.
All rock used in check dams will pass the Los Angeles Abrasion Tests
13-8-2 Revised 07/24/90