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

Ditch Design
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1. Ditch: 22-D1
2. Description: Diversion ditch to collect runoff around pit
3. Grade of Ditch: 7B
4. Arna. Drained: 33 acres
5. Peak Discharge: 48(1.12)(1.25) = 67 cfs
6. Ditch Design
Rxk lining
n = .045
Use ditch w/"V" walls 1:2 slope
A = 2D2; Wetted perimeter = P = 4.472D
RH = A/P = .4472D
~ _ (1.49/n)(A)(Rh)2/3(5)1/2
Q = (1.49/.045)(2D2)(.4472D)2/3(.07)1/2
• 4 = (66.2) (D2) (.58) (D2/3) (.26)
~ = 9.98 D8/3
67/9.98 = D8/3
6.71 = D2.67
D = 2.67 6.71
D = 2.04 feet deep
Pdd .5 foot freetoani
~btal ditch depth = 2.54 feet
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