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 ,26 on
these. While these designs increase the flow, their use has not been as
°xpected. The increased costs of the special treatments is apparently respon-
sible. 1
)g IMJ}X fA111'TEIC= .2.0
leo 10.000 At?OVE G/gt
Ise • .8,000 LOSS COEFFICIENT K 111
s 000 FOR VARIOUS ENTRANCE (2)
- rss TYPES 6.
s,00p (3)
144 0,000 FM1V ENTRANCE 5. 6.
p SCAtE TYPE CO €FFICIFNT
- 132 3,000 6.
(1) MeodWall. s4. edge; or End 0.3
r20 ar 3ecnw <anferm�n0 lofill 5,
j 2,000 dppe 4
I08 0_ (2) M6endre <enfarm rp slope 0.7 P (3) F.j.n4 fram fill D9 3. 4.
4 HEADWATER DEPTH FOR
12 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 August 2009(PB06) Attachment 2.05.3(3) -1 -65
9
3.
tp UM ital! 12) er 13) prpj!(!
1
84
600 harisln.al)y ro xalelD, Then
1 400
2.
500 vsrrai9hr mdked line rhrea4h
D and O wales, or rmeru us
Illuanoied.
2.
T2
2.
300 p
-
m
3
<
'-
s0 _
x
1.5
is
O
V
f
`a
_D
V
c
x.a�lE
0
1.0
1.0
42
-_ a
T
PLE O
V
Lo
}6
-48in. -oft
0 = 7o tt%e< 3
0.9
33
_ - -_ - -_ v
w
0.8
0.8
Hw HW
30
0'
1.0 4.0 ft
2T
1.0 4.0
V
9 (3) 1.1 4.4
0.7
0.7
is
24
07
8
0
5
u
21
4
O.b
�
0.6
' CAPFICA
o.s
Vi
e
2 = 9.5 CFS
13
1 1.0
0.5
0.5
4 HEADWATER DEPTH FOR
12 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 August 2009(PB06) Attachment 2.05.3(3) -1 -65