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While the Parshall flume addresses many water measurement applications well, there are times when it just isn’t quite for the application. At those times a modification of the Parshall may be a better fit. Usually these modifications are driven by cost, portability,…

In its simplest form a Packaged Metering Manhole (PMM) consists of a primary device (typically a flume or weir) molded into a fiberglass (FRP) manhole. By directly factory integrating the primary device, a single-piece, drop in-place flow monitoring solution is created.

There are three general types of Staff Gauges used to measure flow in primary devices: molded-in, adhesive, and rigid. Of the three, the adhesive gauge is the least durable. This is not to say, however, that adhesive gauges do not serve a purpose, only that there are limitations…

Traditionally end adapters for flume are specially shaped transitions attached to the inlet or outlet of a flume for inline connection with piping. But did you know that end adapters can also be used to transition and condition flows in open channels? Well, they can when they are…

Openchannelflow is please to introduce our new line of one-piece Fiberglass Equipment Shelters. These shelters are built for rugged, year round use in the most demanding of conditions. Molded from high strength, corrosion resistant fiberglass, Openchannelflow fiberglass shelters…

Openchannelflow is pleased to announce the release of our new line of Redstone Series Fiberglass Enclosures to house monitoring equipment and provided secure storage of chemicals and equipment. Redstone Series enclosures are designed to be aesthetically pleasing and blend into…

One of the key elements in using a flume for accurate flow measurement is ensuring that sub-critical flow is present.

For applications where the depth of a Packaged Fiberglass Manhole has been undersized, Openchannelflow offers Manhole Extensions. These Extensions are designed to provide standardized solution integrating the height modification, top, and ladder into a single drop-in-place piece.

Mill Creek Regional - Effluent Tunnel - 120-Inch Parshall Flume

One of the problems contractors often face when installing a flume in a concrete manhole is forming the transitions into / out of the flume. Done poorly and the result is a flume that either experiences turbulence or submergence – both which will seriously compromise the…

Custom fiberglass enclosure to house a composite sampler in a difficult location USAF - Vandenberg AFB / Pillar Point AFS / Tetra-Tech (San Luis Obispo)

Over the years several different styles of Palmer Bowlus flume have come into the marketplace, including the Insert style. While the original Palmer Bowlus flume was intended to be used in-line with piping, the Insert style is intended to nest into an existing pipe – not…

Can a new flume be installed in an existing Packaged Metering Manhole? Maybe. There are a number of factors to consider: manhole barrel diameter, manhole top style, existing flume style / size, and desired flume style / size.

It is with great pleasure that Openchannelflow announces that Heyward-Charlotte Incorporated has signed as a full-line representative of Openchannelflow in the Carolinas. Tracing their roots back to 1908, Heyward Inc. is a premier sales agency in the Carolinas and surrounding…

Openchannelflow manufactures fiberglass Parshall flumes in sizes from 1 inch to 12 feet. Constructed of premium polyester resin, Openchannelflow’s Parshall flumes conform to ASTM D1941-91, ISO 9826:1992, JIS B7553, and the Bureau of Reclamation’s Water Measurement…

At Openchannelflow, we continually strive to make our products as easy as possible to use. Ultimately we want you to think of them as appliances...something you can use without having to think about it. We want you focused on your data, not how you collected that data. To that…

Putting a flume in really isn't that hard. You can really break down it down into five steps: Now is the time to take the time to get familiar with the flume. Make sure that you understand how the needs to sit in the channel. The important thing here is to know which end goes…

Reduced height flumes provide a convenient solution to applications where the anticipated flows at a site do not warrant a large flume, but where the flow channel is wider than can otherwise easily / economically accommodate a smaller flume.

Unless you use or put in flumes for a living, you may not be familiar with the layout of a typical flume installation. The components of most flume installations are: the flume (naturally), the sensor, and the flow meter.

wastewater can be a pain to accurately measure. The environment is corrosive and humid; while the flow itself can experience wide swings due inflow and infiltration. Wastewater is usually carried in non-full open channel pipes. Measuring in these pipes is considerably more…