Blog

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…

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…

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…

Of all of Openchannelflow's products, our Weir Boxes receive the most calls for customization; more so than our flumes, manholes, or even equipment shelters.  Some of the customization possible includes:   Materials of construction Flow capacity  Flow…

Industries measure their discharges either to meet their NPDES permit or because of municipal / county requirement. For industrial operators charged with monitoring their process discharges, a Packaged Metering Manhole can be a cost effective solution to their flow measurement…

Openchannelflow has designed a bubbler flow meter tube for flumes and weirs that is unique in the marketplace.  The tube is one continuous piece of thick walled tubing.  The top of the bubbler tube - where the traditional compression coupling is found - is swaged to…

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…

At flow monitoring stations where a Packaged Metering Manhole is used to measure / sample a flow stream, the flow monitoring and sampling equipment is usually housed either in a dedicated equipment shelter or in a nearby building.  There are times, however, when neither…

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…

Industrial Flow Monitoring / Sampling Stations provide pre-engineered, factory integrated solutions to the need for industrial dischargers to monitor, sample, and report their NPDES discharges.   A typical station consists of two parts: fiberglass Packaged Metering Manhole…

To help the growing list of operators of our fiberglass Packaged Metering Manholes maintain their investments, Openchannelflow has put together an inspection form to standardize the collection and reporting of data useful in establishing maintenance cycles for Packaged…

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…