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. White these designs increase the flow, their use has not been as
°xpected. The increased costs of the special treatments is apparently respon-
sible. t{8 it Ou'I'VEP /1lpX. LcI4"ek
e0 to,000
i.0'tFgaJE
C X68 8,100 LOSS COEFRCIENT ^ K e
I L 5� 6
FOR VARIOUS ENTRANCE tZ}
a
a
a
u
2
v
T
v
c
0
in
{
•
c
a
v
U
0
m
E
E
e
O
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 HW1D 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 -69