Canada’s Instrumentation Leader Since 1946.

Fibreglass Parshall Flumes and Options

Since 1922, the Parshall Flume has been the most widely used type of flume for fixed flow monitoring installations. A special shaped open channel flow section can be installed in a ditch or canal to measure the flow rate. Parshall Flumes are sized by throat width, and conform to standardized dimensions published in the U.S. […]

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Since 1922, the Parshall Flume has been the most widely used type of
flume for fixed flow monitoring installations. A special shaped open
channel flow section can be installed in a ditch or canal to measure the
flow rate.

Parshall Flumes are sized by throat width, and
conform to standardized dimensions published in the U.S. Department of
the Interior, Bureau of Reclamation.

Rather than try to make the flow application fit a particular type of
flume, we carefully analyze the parameters so we can select an
appropriate flume for the application. Options and modifications are
available to ensure that the customer’s requirements are fully met, and
that additional instruments are easily interfaced with the flumes.

Untitled Document

Width
"W"
Ha
Head

Minimum Flow Rate

Ha
Head

Maximum Flow Rate

Inches

Feet

CFS

MGD

GPM

Feet

CFS

MGD

GPM

1

0.07
0.005

0.003

2.2

0.6

0.15

0.10

68.7

2

0.07

0.011

0.007

4.9

0.6

0.31

0.20

137

3

0.10

0.028

0.018

12.6

1.5

1.86

1.20

835

6

0.10

0.054

0.035

24.2

1.5

3.91

2.53

1750

9

0.10

0.091

0.059

40.8

2.0

8.87

5.73

3980

12

0.10

0.120

0.078

53.9

2.5

16.10

10.40

7220

18

0.10

0.174

0.112

78.1

2.5

24.60

15.90

11000

24

0.15

0.423

0.273

190.0

2.5

33.10

21.40

14900

36

0.15

0.615

0.397

276.0

2.5

50.40

32.60

22600

48

0.20

1.260

0.816

565.0

2.5

67.90

43.90

30500

60

0.20

1.550

1.000

696.0

2.5

85.60

55.30

38400

72

0.25

2.630

1.700

1180.0

2.5

103.00

66.90

46200

96

0.25

3.450

2.230

1550.0

2.5

139.00

90.10

62400

120

0.30

5.740

3.710

2580.0

3.5

292.00

189.00

131000

144

0.33

7.930

5.130

3560.0

4.5

519.00

335.00

23300


Typical Options

  • Staff Gauge – available in various widths and markings including flow data
  • Stilling Well – Integral or remote, 6", 8", 10" or 12" ID, with or without plug
  • Bubbler Tube – Stainless steel, 1/4" ID, integral to flume
  • Sampler Tube – Stainless steel, 3/8" ID, integral to flume
  • Inlet and Outlet End COnnection – Integral or removable
  • Pipe Connection – Neoprene boot or ANSI pipe flange connection
  • Special Chemical Resistant Fabrication – pH range of 1 to 14
  • Ultrasonic Transducer Bracket – Fixed at 14" or 24" or adjustable
  • pH Sensor Cavity – Fabricated to fit most sensors
  • Wing Walls and Bulk Heads – Custom fabricated to meet job requirements
  • Nesting Options – Standard or special design
  • Energy Absorption Racks – Fixed or removable
  • Standard or Special Depths – Including surge boxes
  • Enclosed Flumes – For odor control
  • Flume Covers – Grating, fibre sheeting, clear polycarbonate
  • Montana Cut Design – Available in all standard sizes
  • Special Design – Will meet your special project needs