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PERMFILE106413
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PERMFILE106413
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Entry Properties
Last modified
8/24/2016 9:59:08 PM
Creation date
11/24/2007 1:44:58 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982054
IBM Index Class Name
General Documents
Doc Date
6/27/1991
Doc Name
Redesigns SEDCAD information Channels/Ditches
From
PIONEER ENGINEERING CORPORATION
To
MLRD
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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I <br />EAST FILL DOWNDRAIN <br />Channel Bottom Stability <br />DSO = 2.0 feet <br />n = .044 <br />therefore <br />d = ~.0441(43.75L b <br />1.5(1G)(.07b)• <br />d = .63 ft. <br />Stability Checks <br />Use: b = 10' <br />S = .076 <br />Q = 43.75 cfs. <br />T = (62.4)(.63)(.076) = 2.99 #/ftz <br />nb = 21 (2.991 <br />62.4(1.65)(2.0) <br />nb = .305 <br />Assume Angular rip rap ~ = 42~ for a 7.6~ slope <br />B = 4.35 <br />SFb = (cos 4.35)(tan 421 <br />sin 4.35+.305(tan 42) <br />SFb = .997 (.9) <br />.0758 + .305{.9) <br />SFb = 2.56 <br />(over designed) <br />
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