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A Packaged Metering Manhole (PMM) is a factory-integrated fiberglass manhole that mounts a flume, weir, mag meter, or other primary device to allow a user to measure or sample flows from full or non-full pipes. The manhole tube can also be supplied with a range of accessories,…

Generally when we look at applying a Flume to measure flow we are more concerned that the flow is not too energetic. Sometimes, however, the flows can be too slow and too solids laden.

It isn’t always desirable or practical to measure industrial effluent flows below grade. For those applications, Openchannelflow takes our proven Redstone fiberglass enclosures and nests a flow-measuring flume or mag meter. Lockable, rugged, and secure, Redstone enclosures…

Parshall Flume Flow Monitoring Manholes from Openchannelflow take the tried and true Parshall flume and factory integrate it into a fiberglass manhole. The resultant structure is perfect for monitoring industrial discharges, municipal sewers, and dam seepage on below grade…

When installed in manholes or potential pedestrian traffic areas, flow monitoring flumes can be a hazard. A typical flume installation is an open trough that that an operator can inadvertently step or fall into.

Like many flumes, the Cutthroat flume was originally conceived to measure agricultural / irrigation flows. Over time, however, the Cutthroat flume has been adapted to measure open channel pipe flows. Specially shaped transitions (end adapters) allow the Cutthroat flume to connect…

A watershed is an area of land that feeds all surface and ground water into a single body of water (stream, river, lake, etc.). Watersheds can combine to form progressively large watershed networks that drain into progressively larger bodies of water. Watersheds are typically…

One of the questions that we get asked again and again is: where do you measure the flow in a Parshall flume? But which is right? Are they all right? Are none of them right?

One of the requirements of accurate flow measurement with a Parshall flume is a tranquil flow approaching the flume. Poorly balanced, surging, or turbulent flows will adversly affect the systems accuracy for both instantaneous and totalized flow. Here we have an example of highly…

Many times Flumes have to be installed in applications where the flow cannot be properly conditioned before it enters the flume. For those applications, Openchannelflow offers Energy Absorbers and Tranquilizing Racks to helps dampen and condition the flow entering the flume.

Insulated flume covers from Openchannelflow can help to provide better flow data during cold weather periods by eliminating frost / ice build up on the flow meter sensor as well as insulate the space above the flume. When used in conjunction with a strip, pipe, or immersion…

When Dr. Parshall published his studies on what would come to be known as the Parshall flume he originally did so in The Colorado Agricultural College publication: The Improved Venturi Flume.