Single Exponential, P- 40 = 1 (cont’d)
FLUMES (cont’d)
Leopold Lagco (as manufactured by Leopold Co., Inc.)
» designed to be installed directly into pipelines and manholes
» Leopold Lagco may be classed as a rectangle Palmer-Bowlus flume
» sized by pipe ( sewer ) diameter
» for rated flows under free flow conditions, the head is measured at a
point upstream referenced to the beginning of the converging section.
Refer to the following table:
» general free flow equation is Q = K H
x
, where: Q = flow rate
K = constant
H = head
x = exponent
» position the transducer such that it is centered over the flow at a
minimum height of 30 cm ( 12" ) above the maximum head.
throat
converging
diverging
side
point of measurement
plan
0
head
front
Flume Size Point of Measurement
(pipe dia. in inches) cm inches
4 - 12 2.5 1
15 3.2 1
1
/
4
18 4.4 1
3
/
4
21 5.1 2
24 6.4 2
1
/
2
30 7.6 3
42 8.9 3
1
/
2
48 10.2 4
54 11.4 4
1
/
2
60 12.7 5
66 14.0 5
1
/
2
72 15.2 6
PL-443 6 – 35
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