Blog

Pure and simple, Openchannelflow makes fiberglass Parshall flumes.  We aren’t resellers, we aren’t distributors, and we don’t job shop production. Catalog companies and “design” resellers simply don’t have the close-coupled integration of…

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…

Openchannelflow offers Shaped Transitions to transition flow into / out of flumes when a standard end adapter or wing wall won't work.   Shaped Transitions can based on Openchannelflow's standard end adapter designs (but open at the end) or they can be custom to…

Openchannelflow offers bolt-down covers as an option for flumes and weirs in fiberglass, Lexan, galvanized / stainless steel.  The covers are suitable whether the flume or weir is above grade, below grade, or installed in a Packaged Metering Manhole.  For…

Replacement flume floors (aka "magic bottoms") are designed to correct installation problems associated with setting a flume too low in relation to the channel surrounding channel - helping to reduce or eliminate submergence.  Replacement flume floors - available for…

Nested flumes are traditionally Parshall, Montana, or Cutthroat styles, but Palmer-Bowlus flumes can also be successfully nested. The ability to nest flumes inside each other can be use in a variety of applications, including both temporary flow changes of a defined period…

Packaged Metering Manholes (PMMs) factory integrate a flow measurement flume / weir into a fiberglass manhole to provide a complete, turn-key solution to monitor industrial and municipal flows.  Openchannelflow Packaged Metering Manholes come complete and ready for…

Traditionally flumes are used to measure at or below grade flows.  These flow are commonly natural channels (gullies, swales, creeks, streams, and rivers) or manmade channels (treatment plants or storm drains) / piping.  But what happens when the flow to be measured in…

The Department of Civil Engineering and Geomatics' Hydraulics Laboratory at Universidad Nacional Autónoma de México has an interesting video posted showing the hydraulic profile of a Parshall flume under both free and submerged flow conditions.

More common on Parshall flumes, end adapters are also available on Cutthroat flumes from Openchannelflow.  End adapters are specially formed transitions to allow water to flow into / out of a flume in a controlled manner.  On the inlet, end adapters are designed to…

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,…

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…