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The 120-inch Parshall Flume is the second largest of the prefabricated Parshall flumes available. The flume is used to measure larger surface water flows, primary water rights channels, and flows at larger wastewater treatment plants. The size of the flume is such that it must…

The primary uses of the 96-inch Parshall Flume are to either measure surface waters (watersheds / catchments / water rights) or sewage flows at wastewater treatment plants. Like the other large Parshalls, the 96-inch Parshall Flume ships in two pieces for field assembly.

At industrial sites where a Packaged Metering Manhole has been installed it is quite common to see a Parshall flume integrated into the manhole. As part of a site visit to assist a local customer, Openchannelflow personnel took the video below to help visualize what a Parshall…

As Parshall Flumes get larger there are fewer applications that they fit beyond measuring surface waters and treatment plant flows. Even then, the 84-inch Parshall Flume is not frequently used - the flow rates for these applications are usually smaller or larger than the 84-inch…

Depending on what the constituents make up an industry's flow stream, a sewer system's owner (city / county) may require pre-treatment and metering before the industry is allowed to discharge to the sewer. For many industries, plant downtime is a major concern when installing a…

The Small 60º V Trapezoidal Flume is smallest of the Trapezoidal Flume family. Due to its size, the flume is primarily used to measure the flow in furrows, ditches, and small channels. The flume has good low-end resolution and passes solids well. The Small 60º V Trapezoidal…

Of the various methods Openchannelflow has developed for conditioning flow for flumes, Tranquilizing Racks are the most common. Tranquilizing Racks are vertical "fingers" that extend down into the flow to break up poor velocity profiles and develop uniform, straight line flow…

For industries required to measure and / or sample their effluents prior to discharging to a municipal sewer system or surface water, finding sufficient area to install a primary device can be a struggle. In many instances, it is difficult to find a site that provides sufficient…

Bubbler style flow meters provide the most accurate measurement of level in open channel applications; more accurate than ultrasonic or even pressure transducer flow meters. Using an internal air compressor to push a measured volume of air through a vinyl or Teflon bubbler line,…

The 36-inch Parshall Flume is equally at home measuring water rights, sanitary flows, and surface waters. The 36-inch Parshall Flume is useful in a number of applications:

Pure and simple, Openchannelflow makes fiberglass Parshall flumes. We aren’t resellers, we aren’t distributors, and we don’t job shop production. What we are is manufacturer of premium quality, dimensionally accurate, and corrosion resistant fiberglass Parshall…

The typical bracket used to mount an ultrasonic sensor over a flume or weir is a contractor fabricated one-off assembly. These assemblies often mount the ultrasonic sensor too high, too close to the flume / weir sidewall, or aren't sufficiently rigid - making accurate flow…