2010-12-08_PERMIT FILE - C1981008A ‎(6)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 12/8/2010
• 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 designs.
The Federal Highway Administration has developed extensive data on
these. While these designs increase the flow, their use has not been as
Txpected. The increased costs of the special treatments is apparently respon-
sible.
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166
- LOSS COEFFICIENT K6 (l l
6,aoa FOR VARIOUS ENTRANCE t2)
- ' } e TYPES 6.
},DOp (3)
144 4,000 ±! SCALE
, U SCALE TYPE COEFFICIENT
32 3000
T4,5 i} e c ,[m.edge: End 0.3 120 u 2,000 5e[tien antarmin9 to o (ill done 108 a) Min,'" lm center. tadape 01
(st Praiec i. g fine. 011 0.4 3.
a
96 ' 1,000 3,
r✓` 800
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84 600 Fe6xaere inclined a ramie n 1. they
500 Se. vai4M1r m[line4line,hma8h 2.
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400 Hlvmmr :d.
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300 p
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200
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40 EXAMPLE
30 ram.t0t =48in. =4ft y -6-9 0= T W /sec 3
(� scale "W nw = 0.8 0.6
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HEADWATER DEPTH FOR
2 CORRUGATED STEEL PIPE CULVERTS
WITH INLET CONTROL
Figure 3.28 Inlet control nomograph for corrugated steel pipe Culverts. The
manufacturers recommend keeping HW /D to a maximum of 1.5 and preferably to no
more than 1.0 for diameters greater than 4 to 5 feet.
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Revised August 2009(PB06) Attachment 2.05.3(3) -1 -66