PERMFILE113314

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 7/30/2007
• Doc Name: Collection/Diversion Ditches and Culverts Design Parameters
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-1
• Media Type: D
• Archive: Yes

• Improved Inlets
Culvert capacity may be increased through the use of special inlet desi~ns.
The Federal Highway Administration has developed extensive data79~ on
these. While these designs increase the flow, their use has not been as
sxpected. The increased costs of the special treatments is apparently respon-
sible. 3©d MRK i~ocTER= IES t
1}gWE Gtlts~RT"
Iso lo,ooo
Ise , e,ooo LOSS COEFFIC1ENf Kt (l
s aoo FOR VARIOUS ENTRANCE (2l
Ise soup TYPES e. t3)
144 4,000 lry/ EMRANCE S, e.
C Sr.ALE TYPE COErEK1EHT
., q2 3,000 6.
i17 Mted..el4 q.~~: a•End Od
iY0 u 2,000 t~~tO"temiagm121 4 S.
108 e ~ MA•redb •whrw le Yopo O)
0 171 rreiau6p 4em fill 0.9 3. 9.
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• Towul KON RI r171 o.qM
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HEADWATER DEPTH FOR
Iz CORRUGATED STEEL PIPE CULVERTS
wmf innr:r cofvrRO~
Figure 3.28 Intet control nomograph for comEgated steel pipe culverts.'s The
manufacturers recommend keepng HWID to a maximum of t.5 and preferably to no
more than f .0 for diameters greater than 4 to 5 feet
•
REVISED MARCH 2006
Attachment 2.05.3(3)-1-61