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The Large 60º V Trapezoidal flume is one of the original Trapezoidal flumed developed. The flume has good low-end resolution, while the v-shaped cross section allows for larger flow rates to be measured with reasonable head. Solids passage is good with the flume having a flat…

The 4-inch Palmer Bowlus Flume is the smallest of the Palmer Bowlus family of flumes. The flume can pass sanitary solids without clogging. Palmer Bowlus Flumes are not usually used to measure surface waters.

The 18-inch Parshall Flume is mainstay at wastewater treatment plants. It can also be found out in the field helping to measure water rights. Openchannelflow's 18-inch Parshall Flume is available in several configurations:

The 6-inch Parshall Flume is one of the sizes developed by Dr. Parshall during his initial studies. The flume works well in measuring water rights and can be found as smaller wastewater treatment plants. The 6-inch Parshall Flume has been successfully used to measure flow in a…

For a flume to operate properly the flow entering it must be: In below grade applications, one device can help a user do all three: The Energy Absorbing Manhole.

One of the things to look at when selecting a material for your Parshall flume is how long the flume will actually last. A flume's lifespan can be as important as it's cost if a poor material selection results in a short useful life.

There are times when the standard sidewall height on a flume just won’t do. Sometimes the channel is taller than the flume and there is a need or desire to match the elevations. Other times a site needs additional flow capacity but there isn’t room for a larger flume. And…

We often talk about how flumes and weirs accelerate sub-critical flow to a supercritical state and how that in turn develops the level-to-flow relationships that are used to determine the flow rate. In the past we’ve defined the various stages of critical flow by the Froude…

If circumstances allow, it is preferable to have a flow measuring device operate under free-flow conditions. The obvious advantage is that only an upstream flow depth need be measured to determine the discharge. The procedure to follow for installing Cutthroat Flumes in existing…

Beyond the normal approach and installation problems, there are a number of factors can affect the accuracy of a Palmer Bowlus flume measuring flow. These include: approach channel conditions, deposits, Froude number, longitudinal slope, and roughness.

We all know the usual points of measurement, Ha (primary point of measurement), Hb (point of measurement to determine submergence), but what about Hc? The Hc point of measurement appears in Dr. Parshall’s earliest works on what would become his namesake flume. The original…

After you’ve selected whether flume or weir for your application, you then have to think about which type of flow meter to use. Usually this comes to down to using an ultrasonic or a bubbler flow meter. Price is a strong advantage for ultrasonic meters – in many ways…