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Openchannelflow Galvanized Steel Parshall Flume for water rights Galvanized Steel Parshall Flumes are an economical alternative to standard fiberglass construction.  Galvanized Steel Parshall Flumes are commonly used to measure irrigation and surface water flows.  

Galvanized Steel Advantages

Galvanized steel Parshall flumes from Openchannelflow are economical, have good damage resistance,  have tight dimensional tolerances, and are available with a range of accessories and mounting / end configuration options.    

Damage Resistance

The heavy gauge construction of Openchannelflow galvanized steel Parshall flumes provide good damage resistance.  In irrigation / water rights applications this can be useful, particularly when cattle or other livestock may be in / around the flume.


Galvanized steel Parshall flumes are economical - less expensive than any other flume material.

Dimensional Tolerances

Skilled metal fabrication can result in galvanized steel Parshall flumes that exhibit the same dimensional tolerance of fiberglass flumes. For Openchannelflow galvanized steel Parshall flumes, the following dimensional tolerances are typical:


  • 1/8-inch [3.18 mm] (12-inch or smaller Parshall flumes)

  • 1/4-inch [6.3518 mm] (18-96 Parshall flumes)

  • 1/2-inch [12.7 mm] (120-144-inch Parshall flumes)

Other Flume Dimensions

  • 1/8-inch [3.18 mm] (12-inch or smaller Parshall flumes)

  • 1/4-inch [6.3518 mm] (18-96 Parshall flumes)

  • 1/2-inch [12.7 mm] (120-144-inch Parshall flumes)

The above dimensions are within the +/-2% of nominal required by ASTM D1941-91(2013) Standard Test Method for Open Channel Flow Measurement of Water with the Parshall Flumes.

Configuration Flexibility

While not as many accessories or mounting / end configuration options are available for galvanized steel Parshall flumes, Openchannelflow still offers a considerable range - including end adapters and wing walls.  

Contact Openchannelflow for additional details.

Galvanized Steel Disadvantages

While galvanized steel Parshall flumes have a number of advantages, it is important to remember that there are several disadvantages to the material.


Galvanized steel Parshall flumes weigh more twice as much as their fiberglass counterparts. This increased weight means that more manpower / heavier duty equipment is typically needed to install the flume.  Additionally, the added weight means that galvanized steel Parshall flumes are not generally used in remote watershed / catchment applications.

Abrasion Resistance

The surface galvanization on the flumes can be abraded by heavy / sharp sediments in the flow stream.  In applications where these are present their will be a need for ongoing maintenance of the galvanization or a different flume material (typically stainless steel) should be used.


Depending upon the application, the galvanized surfaces of the flume may present an ongoing maintenance issue.  Where the hot dipped galvanization has been worn away, the surface must be dried, cleaned, and the cold galvanization applied.

More About Galvanized Steel Parshall Flumes

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