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.
t9
The Federal Highwa y Adm inistration has developed extensive data
~ 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.
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LOSS COEFFICIENT KB t I )
IBS , FOR VARIOUS ENTRANCE t2)
- Iss B,DOO TYPES s.
3,oop i3)
MI 1,000 IEVr tMAANCF S. 6.
SCwtE
COEFFICIENT
.. 13Y 3,000 p
TYPY
6.
111 NnMall, fq. bpt w End O.S
i20 O Y,000 ~ COnlpM1p1"9ro1i1 9.
4,
108 0_ n) w7.cedro<edwmroJooe aJ
c ql tholydnY 1rce, ql 0.9 3. 4.

98 ~ 1,000 3.
N 800 ro uN rcd~121w 111 prgay
B/ X800 hOirraq°PI'1°cc°Nftl,rMn 2.
•H weiphr NcliMd INeflvpgh
SOD OandQwde>. or cswrum
100 Xfwtrared.
Y. 2
r2
u
>a 300 --
3 Ls
~ ~ Y00 ? I.i I.S

.- Ss O
~ E
i0O °
f j e--~- _ o
° Bp O
•
t
_ ~
.~c~ar
~~_ s LO
° IY r ~ `
~ ¢ _ 1.0
- -
m ~ 10 1.0
E%AMPIE ~
E
0 38 yo om.iD1c18in.•41E ° '9
g
3
o Q+TOtl
/sac ,
0.8
33 O ___
°
= 0.8 0.8
Sea4 NW NIV
3O D•
O.e
(I1 1.0 •0 h
,$ n m rn la a.o
rn /.1 c~ 0.7 o.T
m YI B
a 0.7

~ Y1 1 VYPt~/ITy O.8 O.6
v°

` Is 3 .
{
v ~ 0.8
V 'g
_ E
N Y
f IS 0.8
1.0 O.S
HEADWATER DEPTH FOR
12 CORRUGATED STEEL PIPE CULVERTS
WITH INLET CONTROL
Flgure 3.Y8 !n!e! control nomograph for corrugated sleet pipe culverts.13 The
manufacturers recommend keeping HW/D to a maximum of t.5 and preferably to no
more than 1.0 for diamel0rs greater than 4 to 5 feet.

REVISED MARCH 2006
Attachment 2.05.3(3)-1-60