What is a Flow Measuring Weir?
A flow measuring weir is simply a structure over which water flows in such a way that volumetric flow rate can be calculated….it lets you know how much water is flowing! Many times a flow measuring weir is simply a thin plate across a flow stream, but weirs can also…
Weir Corrosion and Stainless Steel
Weirs are often described as “simple” and “low cost” ways of measuring open channel flows and, made of some materials they really are low cost. But this low cost comes at a price (no pun intended). Steel plate is frequently used to keep costs down and,…
Who is Openchannefllow?
As we reach our 300th blog, we were looking for a topic that went to the core of who we are at Openchannelflow. Then the idea came to us: Let's talk about who we are and what we stand for! Openchannelflow is a skilled manufacturer of devices for the measurement,…
Sediment and Open Channel Flumes
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. When this happens on low flows where the sediment load is high (and the sediment heavy),…
Measuring Industrial Effluent Above Ground
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.
X-Web Construction for Fiberglass Buildings, Shelters, and Enclosures
To give our building, shelter, and enclosure products superior strength and dimensional stability, Openchannelflow has developed proprietary X-web technology. Each wall or roof section is composed of insulating foam core section. Around these X-web construction structurally…
Fiberglass Buildings for Equipment Protection
Whether you call them buildings, shelters, or enclosures, pre-engineered structures from Openchannelflow offer superior walk-in protection of equipment and process machinery for even the harshest of conditions.
Fiberglass Enclosures for Automatic Samplers
While many composite wastewater samplers on the market today tout NEMA 4X housings, the need to house and protect them has not gone away. Whether the need is to protect the sampler from vandalism or the corrosive effects of a treatment plant environment, fiberglass sampler…
Supercritical Flow over Thin Plate Weirs
Weirs, like flumes, work by accelerating slow, sub-critical flow to faster moving, super-critical flow. The acceleration develops a know relationship between level and flow upstream of the weir itself. But what happens when the flow approaching the weir isn’t…
Parshall Flume Flow Monitoring Manholes
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…
Fiberglass Grating Covers for Flumes
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…
Measuring Pipe Flows with Cutthroat Flumes
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…
Flow Tables for Circular Weirs
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…
Measuring Watersheds with H Flumes
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…
Domed Tops for Fiberglass Packaged Metering Manholes
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…
Where to Measure Flow in a Parshall Flume
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…
Turbulent Flow and Parshall Flumes
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.
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