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
Calvert capacity maybe increased through the use of special inlet designs.
The Federal Highway Administration has developed extensive datat 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. 30 ff MAX kJII+'FTEQ= 1,5 1
ArmwE Ct Lveky
00 10,000
169 .8,000 LOSS COEFFICIENT Ke f l l
6,000 FOR VARIOUS ENTRANCE (2)
- Ise TYPES 6.
5,00p (3)
144 4,000 )AV ENTRANCE 5, 6.
D SCALE TYPE COEFFICIENT
- 132 3,000 5 U 6.
I ll Headwll, sq. edan: or End FO9 4.
120 G 2,000 iacnagnfwmingm fill 4 5.
do
too a. fD Mne.ad b aanla.m ra sloaa
c i3) Pruiwin41'.. fill 3. 4.
i
96
N
84
i2
� 60
0
54
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v
0
42
m
E
a 36
O
33 /
0
m
27
m
° 24
m
0
v
21
v
0
a
a
18
Vf
it
1,000
BQ0 Ta to. Mol. (2)., (31
walla
•600 Parillnla lly le wale (t), Ihen
u Sao De D c i i l inclined line iMaugh
nd oscalls. ar rl'enea+
400 ill memttd.
300
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� 200
n
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loo
so
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so
50 f �
7
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3 5 2
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-/ OI —a 1O
T EXAMPLE
3 OiamAD)= 48in.=4If .
0
____ _ 70
-- --
30 a
&ale HW MW
S
D'
(1) 1.0 4.0 I,
10 (2) 1.0 4.0
9 (3) 1.1 4.4
6
a
4 G'PtPAL't' Y c 3E11D
3 F3
2 KV
9e
0.8 I- 0.8
0.7 t_ 0.7
0.6
W
1.0
0.4
a:s
0.7
016
M
HEADWATER DEPTH FOR
12 CORRUGATED STEEL PIPE CULVERTS
WITH INLET CONTROL
Figure 3.28 Inlet control nomograph for corrugated steel pipe culverts. The
manufacturers recommend keeping HIMID 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 -67