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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 represents an open trough that that an operator can inadvertently step or fall into. On large flumes with large pipe stubs, the danger can…

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…

Measuring open channel (non-full pipe) flows in round pipes can be difficult when measurement costs need to be low or where power is not available at the site. There are proprietary weir inserts available, but they can be inconveniently sizes or insensitive or unrated for the…

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…

For installations where a Packaged Metering Manhole will be located away from vehicle and pedestrian traffic, Openchannelflow offers domed fiberglass tops.  These tops are lightweight, structurally strong, and provide excellent operator access.  Openchannelflow offers…

One of the problems that we see again and again is confusion as to where the flow should be measured in a Parshall flume.  We've seen flow measured: In the throat In the converging section (random location) In the converging section at a distance 2/3 the length of the…

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.

There are two general methods of mounting a door on a fiberglass equipment shelter:  strap hinges and piano hinges.  Strap hinges secure the door at two (or more for taller / wider doors) points on the doorframe.  The hinges are surface mounted to the doorframe of…

In tight equipment shelter installations every square foot can count.  But tight spaces can also mean increased ventilation needs.  To increase ventilation and to free up valuable wall space, Openchannelflow offers factory integrated door vents for our line of…

Fiberglass shelters from Openchanneflow provide a pre-engineered, corrosion-resistant, and structurally sound way to protect vital equipment.  With almost limitless possibilities when it comes to door / access hatch integration, operators can access the shelter interior…

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…