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 inter designs.
The Federal Highway Administration has developed extensive data14 on
these. While these designs increase the Flow, their use has not been as
expected-The increased costs of the special treatments is apparently respon-
sible. t j
IE MRX w~R= x.~l
leo lo.ooo ~80EiE C.nnlEpT
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4 00o FOR YAR1CN/5 ENTRANCE l2j
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HEADWATER DEPTH fOR
la CORRUGATED STEEL PIPE CULVERTS
WITH INLET CONTROL
Flgure 3.28 Inlet control nomograph for corrugatetl steal pipe cuherts.'s The
manufacturers recommend kaepirg fiW/D to a maximum of 1.5 and preferably to rw
more than 1.0 for diameters greater than 4 to S feet.
REVISED MARCH 2006
Attachment 2.05.3(3)-1-59