The Parshall flume was developed by the US Soil
Conservation Service in the 1920’s to measure irrigation water flow. Parshall flumes principle advantages include low head
loss, self cleaning capability, and their ability to withstand relatively high degrees of submergence without affecting the rate of
flow. Parshall flumes are best used in channels having rectangular cross-sections. Parshall Flumes are the standard
for most waste water treatment plant influent and effluents. Parshall flumes can be use with non-full pipes if a suitable
transition is provided, however extreme care must be taken when mating Parshall flumes to circular channels. For more
information on monitoring Parshall flumes see the FC200, Open Channel Flow Monitor. For
information on how to install a Parshall Flume click HERE.
Table of Dimensions
W
A
2/3A
B
C
D
E
F
G
J
K
N
Price
1
14-9/32
9-17/32
14
3-21/32
6-19/32
9
3
8
9-1/4
3/4
1-1/8
$516
2
16-5/16
10-7/8
16
5-5/16
8-13/32
12
4-1/2
10
12-7/8
7/8
1-11/16
$678
3
18-3/8
12-1/4
18
7
10-3/16
24
6
12
25
1
2-1/4
$837
6
24-7/16
16-5/16
24
15-1/2
15-5/8
24
12
24
27
3
4-1/2
$1,291
9
34-5/8
23-1/8
34
15
22-5/8
30
24
18
33
3
4-1/2
$1,648
12
54
36
52-7/8
24
33-1/4
36
24
36
39
3
9
$3237
Table of Flow Data
Size
1"
2"
3"
6"
9"
12"
Min CFS
0.001
0.001
0.001
0.001
0.005
0.006
Min MGD
0.001
0.001
0.001
0.001
0.003
0.004
Max CFS
0.22
0.68
2.91
6.16
12.51
21.68
Max MGD
0.14
0.44
1.88
3.98
8.09
14.01
Complete Flow Table
NOTE: Flow tables are only valid to the E (height)
measurement of the Parshall Flume.