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-D3
2. Description: Diversion Ditch
3. Ditch Grade: 3%
4. Area Drained: 39 acres
5. Peak Discharge: 50 (1.12)(1.15) = 64.4 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
From chart 2' FB DT w/2:1 D = 1.57
Depth for "V" DT w/2:1 SL
D = 2.01 feet
See chart 1031.2-2 fi
Calculations below
A = 2D + 2Dz V = 8.0 fps
= 3.14 + 4.93
= 8.07
D =~ A -
2
2
= 2.01
Use 7_.51 feet deep with 0.5 freeboard
i~