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Cribbing (bracing) a flume is one of life's little chores. It isn't something we want to do, but rather something we have to do. If it is done well, the results are great. If it is done poorly (or not at all), trouble is bound to follow. In installing the Parshall flume below,…

“Long-throated flumes have many advantages compared to other measuring devices (for open channel flows), including Parshall flumes. Long-throated flumes are more accurate, cost less, have better technical performance, and can be computer designed and calibrated.”

Steel, while not used in wastewater applications, is a common material of construction for flumes used in water rights and irrigation applications. Both painted and galvanized steel are used for these applications; of the two, though, galvanized steel is the most common. Painted…

One problem application we see time and time again is measuring the flow out of a UV disinfection system. To keep the UV bulbs cooled and to increase the treatment efficiency of the disinfection system, usually the UV system provided has V-shaped overflow weirs just downstream of…

The installation of a Palmer Bowlus flume is a straight forward and can be accomplished with a minimum of effort. The straight-through, u-channel design means that there are no changes in elevation to accommodate and that the flume is well suited for installation in manhole…

The most common way of transitioning flow into and out of a Parshall flume is to simply form a channel up to and away from the flume. This works in many situations, and was in fact the way that Dr. Parshall himself installed his flumes. But what about when you need to measure…

Irrigation flumes can be categorized into two groups: those used for Water Rights and those used to measure in-field flows (furrows).

A nested (or dual-range) Parshall Flume is one where a smaller, lower flow range flume has been mounted into a larger, higher flow range flume. By nesting the two different flumes together, over time two substantially different ranges of flow can be measured in one installation.

As State Engineer’s Offices become more concerned over accurate measurement of water rights withdrawals, flow-measuring devices are becoming mandatory. These flow-measuring devices typically take shape as flumes – with the Parshall and Cutthroat flumes being most common. Both…

Fiberglass Packaged Metering Manholes are a great solution to the problem of measuring piped flows below grade and provide a unique set of benefits to consulting engineers who specify them. Accuracy, in this context means, installation accuracy by the contractor and the flow…

When using a Parshall Flume to measure pipe flow, it is important that sufficient upstream distance be provided to allow the flow to become tranquil and to assume a normal velocity profile as it enters the flume.

The USGS Portable Parshall flume is a modification of the standard Parshall flume where the discharge section has been removed. The purpose of the modification is to reduce the weight of the flume and to make it easier to install.