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 m ay be i ncreased through the use of special inlet designs.
The Federal Highway Administration has developed extensive data19 on
these. While these designs increase the flow, their use has not been as
4xpected. The increased costs of the specia) treatments is apparently respon-
sible. ~ N PTAX wAfE2= !.5 ~
A$9VE CtKyEQ-~
ieo -
Isa
loooo
, e,ooo
LOSS COEFFICIENT Ra t t)
s
ooa FOR VARIOUS ENTRANCE t2)
19s ,
3 00~ TYPES s. (3)
ts; 4,000 Nw ENTRANCE 3. e.
SCALE
CtJEfFIGFNi
-132 3,000 7Y9E
D
6.
411 11eodYaR. Yt Mgrl w Fnd 0.3
tzo a
0
2,000 s.<xwaanra,m;,,yrora 3.
Japr 4.
10R o.
o ID Mihredrotwbmto slaw 0.7
4
J

i .
.
ril hatMbq from fiR 0.9
- 98 ~ I,OOD J.
N BDO 7ou»wlr t71wr77wwra

4 8;
600 holii:anroR7 ro »aN IU,+Mn
u»Ymiphr Mrlhvdrfarthraugh 2.
900 OondO xdo. wrewr»w
;00 ilaaraM.
2• 2
72 ,
~
m SOO b
\ 1.3
e ~ Ki 200 ~ L5 LS
R]
_
S; ~
E
n 100 p

m ; E%AAi9tE O I.O
E
w S0 Oiam.(Ol•4ein.a Ott ~ '
O O. 70 }13J9;c 0.9
3S
20 _________ -_
S ryy,. = 0.8 0.8
Scolr
SO ~
0.8
n nr t.o tox
Y' 27
o 10 111 lA t0
rb t.t a, 0.T 0.T
a Y; e
8 0.7

0
:. 3
e~~-
9 ; o. 0 9
S ~ ~7r D ~ 0.6
p I!
N 2
10 3.3
t,0 0.3
HEADWATER DEPTH FOR
1z CORRUGATED STEEL PIPE Ct1lVERTS
WITH INLET LONTROL
Flgure 3.28 Inlet control nomograph for corrugated steel pipe culverls.13 The
manufacturers recommend keeping HW/Dto a maximum of f.5 and preferaoty to m
more than 1.0 for diameters greater than 4 to 5 teat.
•
REVISED MARCH 2006
Attachment 2.05.3(3)-1-62