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-D2
2. Location: West of Coal stockpile, diversion
3. Grade: 57,
4. Area: 15.5 acres
5. Peak Discharge: 24(1.12)(1) = 27
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
Calculations below
From chart 2' FB DT D = 0.93 A = 2D + 2D2 V = 7.5 fps
!• = 1.86 + 1.73
= 3.59
Depth for "V" DT w/2;1 SL D =1~/-~A~-
_~3. 59
2
= 1.34
D - 1.34 feet
Add .5' freeboard
D = 1.84 feet
This ditch is temporary until working in Section 15 begins
and sediment control is installed.