PERMFILE105841

• Permit No: C1981048
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT V-3
• Media Type: D
• Archive: No

• Revised Ditch Design
1. Ditch: 15-D1
2. Location: Diversion above coal stockpile
3. Grade of Ditch: 5Z
4. Area drained: 53 acres
5. Peak Discharge: 65(1.12)(1.14) = 83 Cfs
6. Ditch Design:
* The peak discharge was assumed to be correct for the purposes
of the revised ditch design.
n = .030
Use ditch w/"V" walls 2:1 slope See chart 1031.2-2 fi

From chart 2' FB DT D = 1.60
* Depth for "V" DT w/2:1 SL
D = 2.03
Add .5' freeboard
D - 2.53 feet
Calculations below
A = 2D + 2D2 V = 10.0 fps
= 3.2 + 5.12
= 8.32
D = ~-
2
=~32
2
= 2.03
This ditch will be modified to 5.1 after Pond 15-D9 has been
installed. At that time, culvert C-6 will become idled for
usage. New design parameters are 160 cfs (from 15-P9), 12
percent and dirt lining (.06 = n).