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For years Openchannelflow has offered staff gauges integrated into our flume, weir, and manhole products.  Over time, though, we have been asked to expand our offerings to include free-standing staff (level) gauges. Openchannelflow staff gauges are availalbe in a range of:…

On the face of it, mounting a staff gauge on a weir plate to get the head / flow rate seems like a good idea.  It works for on a flume, why wouldn’t it work on a weir? The problem is, as we have seen earlier, the water level in a weir pool draws down as the flow…

A common problem in using weirs to measure water flows is reading the flow level too close to the weir plate.  To understand why this is a problem we need to look at what happens as flow travels through the weir pool and then over the weir crest. In a properly formed,…

We often talk about how OCF tried to sweat the small things.  One of the items that we have focused on is our flow meter sensor mounting brackets.  Many of the designs currently on the market show, what we believe to be, a "good enough" philosophy - that the brackets…

The freeboard is the difference in height between the top of a flume or weir and the highest water level anticipated. Freeboard is a guard against overtopping by waves, unexpected rises in the water level, or miscalculation in the maximum anticipated flows.  Freeboard is…

One problem that we see again and again is how to measure open channel flow in partially full pipes.  For applications where a device can extend off the end of the pipe a number of solutions are used, including:  California pipe (which is extends  vertically up…

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…

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…

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 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…