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To protect flumes in above ground applications, Openchannelflow has developed a range of Fiberglass Enclosures that factory integrate small flow measuring flumes. The turnkey design allows the unit to be dropped in place and requires little in the way of site preparation.

One of the nice things about the Parshall flume is that it lends itself well to flows that shift dramatically over the life of the flume. In applications where water conservation has occurred and the flows that a Parshall flume was designed are no longer occurring, a smaller,…

Originally developed to provide both low-end sensitivity and wide flow, Trapezoidal flumes have expanded beyond the agricultural applications they were designed to measure a wide range of pipe flows.

The Parshall flume is the best known and most widely used primary device for monitoring water in open channels and non-full pipes. It is used to measure municpal sewage, industrial effluent, dam seepage, storm water, irrigation / agricultural flows, watersheds, and more!

One of the problems that operators face is trying to meter a line that is located in a street / parking lot / or other vehicle traffic area. While Packaged Metering Manholes provide all-in-one primary device integration with easy operator access in one structure structure, the…

YouTube user Pener Pã has posted an interesting video showing the installation of a Rectangular Weir Plate with End Contractions into a natural channel.

While the Palmer Bowlus was specifically designed to be used in-line with sewer pipes and conduits, the developers of the flume had originally envisioned the flumes being grouted in-line. Many times, however, it makes more sense to have a watertight connection directly from the…

Those responsible for collecting and reporting industrial pretreatment discharge information (typically flow, pH, BOD, and temperature) are rarely dedicated professionals. Almost always, environmental discharge monitoring is just one of a laundry list of job duties they have to…

To calculate the discharge flow rate of a Parshall Flume several pieces of information are required: With this information and the appropriate free or submerged flow equation, the flow rate can be quickly calculated.

When comparing Cutthroat and Parshall flumes, much is made of the Cutthroat flume’s greater resistance to submergence….but is that really true?

Pressure transducers are a popular method of measuring the water level in flume or weir installations. They are used by water resource managers, engineers, and hydrologists to monitor flow rates in a range of applications, including: agriculture (runoff and water use), watersheds…

While Packaged Metering Manholes provide a turnkey, drop-in-place solution to below grade flow monitoring, not every budget can bear the cost. Many times, flow measurement has to take place in an existing manhole. However, using an existing manhole means that there are fewer…

In agricultural settings, flumes have two uses: water rights apportionment and edge-of-field monitoring. Of the two, water rights apportionment is the more common, being performed by ranchers and farmers throughout the Intermountain and West Coast regions of the US.

The 2-Inch 45º WSC (No 4) Trapezoidal Flume is primarily used to measure surface water flows, but is occasionally used to measure industrial discharges (usually in Packaged Metering Manholes). The flume's flat bottom mean and v-shaped cross-section allow the flume to pass solids…

Although it isn’t always possible to bring power out to a where you need an equipment shelter, that doesn't mean that there isn't a need for it. For those applications Openchannelflow offers a range of non-powered ventilation options for our fiberglass equipment enclosures and…

Under free-flow conditions, short-throated flumes control flow in a region of the flume that produces curvilinear flow. As such, there is only one point of measurement at which the level-to-flow relationship holds. This primary point of measurement, Ha, occurs in the converging…

Where a walk-in fiberglass shelter or building is more than an installation calls for, but where all-weather equipment protection is needed, Openchannelflow offers the Gemini equipment enclosure. Originally designed to house the Teledyne 4700 / 5800 series of refrigerated…

We often talk about how OCF tried to sweat the small things. One of the items that we have focused on is our flow meter sensor mounting brackets. Many of the designs currently on the market show, what we believe to be, a "good enough" philosophy - that the brackets hold the…

For installations where a Packaged Metering Manhole will be subjected to vehicle traffic (AASHTO H-20/HS-20) , formed reducers are necessary to transfer the load to the manhole walls.

ISCO does a great job of presenting a wide range of information on measuring open channel flows in their Open Channel Flow Measurement Handbook. The handbook strikes just the right note when it comes to presenting the material in a way that the casual operator can readily…