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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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!~ <br />WEST FILL DOWNDRAIN <br />CHANNEL BOTTOM STABILITY <br />D50 = 1.0 Feet <br />n = .0395 <br />Use: b = 12' <br />S = .108 <br />Q = 30.0 cfs <br />Q = b drl_51dzi3 S tiz <br />n <br />6 <br />d = n0 <br />1.5 b (S).5 <br />d = .38 feet <br />.0395 (301 '6 <br />1.5(12) (.108)'1 <br />Stability Checks <br />T = vds = (62.4)(.38)(.108) = 2.56 <br />nb = 21 T = 21 (2.561 <br />v(SG-1) DSO 62.4(2.65-1)(1) <br />nb = .52 <br />Assuming an angular rip rap, ~ = 42~ <br />For a 10.8 Slope = tan"~ .108 = B = 6.16 <br />SFb = Cos B tan m <br />Sln 8 + ny tari ~ <br />= Cos 6.16 (tan 421 <br />(sin 6.16) + (.52)(tan 42) <br />- (.9942)(.9001 <br />(.1073) + (.52) (.900) <br />= 1.55 (over designed) <br />
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