2011-11-30_PERMIT FILE - C1981008A

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 11/30/2011
• 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 datat9,28 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.
49F k W. ulATfk
= 1,08 A-.Q o 0r
ISO-
10000
f) f i�s;/s7tT
tN
_ 8,000 LOSS COEFFICIENT K,
Ise
6,000 FOR VARIOUS ENTRANCE f2)
5,0ap TYPES
6.
3
144
4,000 KW
KAY
ENTRANCE
COEFFICIENT
g
6
U
3,000
TYPE
6.
120 2
`0
<1)
2.000
IMad dl, tq edyei e. Ewr
Section Confer Confe fin
0.3
0.
100
21
do"
M'sored w conForm ro dope
0.7
4
°
(3)
Frojoew" From I,
0.9
3•
4.
9e
1,000
3.
e00 To we scale (2) or (3) project
3.
e4
600 ro scale (1). Mew
S00 use snsi, r iwd'wN Goa -"h
2.
D most Q moles. or reverse as
72
400 ile+tatol.
2
2.
300 a
C
C
I
P =
200
I.5
1.5
r
0
S4
0
Y
0
s
�
l00
U
.■.
C
L
go- -
42 a
50
r
40 E%AMM
1.0
0
3e
30 Diem. (0)a48in.■ 4 f
•9
pp
O■ 70ft3 /$*C 3
0.9
33
30
20 ------ --- - --
Scale � MW =
0.8
0.8
(1) 1.0 &0h
0.6
sn
27
10 (2) 1.0 4.0
(3) 1.1 44
0.7
0.7
�s
24
e
0.7
o
V
21
s
4
n
3 CAphalTy
0.6
r,
"
2
0.6
15
0.s
1.0 0.3
HEADWATER DEPTH FOR
i2 CORRUGATED STEEL PIPE CULVERTS
WITH INLET CONTROL
Figure 3.28 Inlet control nomograph for corrugated steel pipe culverts. 13 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.
Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -68