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PERMFILE105841
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PERMFILE105841
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Entry Properties
Last modified
8/24/2016 9:58:42 PM
Creation date
11/24/2007 12:50:46 PM
Metadata
Fields
Template:
DRMS Permit Index
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
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Ditch Design <br />• <br />• <br />1. Ditch: 22-D2 <br />2. Description: Diversion ditch around pit <br />3. Ditch GYade: 3.38 <br />4. Area drained: 23 acres <br />5. Peak discharge: 31(1.12)(1.25) = 43 cfs <br />6. Ditch Design: <br />Ditch lining rock <br />n = .045 <br />Use ditch w/"V" walls 1:2 slope <br />A = 2D2 <br />P = 4.472D <br />Eli = A/P = .4472D <br />Q = (1.49/n)(A)(Rh)2/3(gl/2) <br />Q = (1.49/.045)(2D2)(.033)1/2(.56)D2/3 <br />43 = 38.6 (.18)D2.67 <br />2.66.18 = D <br />D = 1.98 feet <br />Add .5 feet freeboard <br />Use 2.5 feet deep <br />n <br />LJ <br />
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