Case Study - Bureau of Reclamation - Field Assembled Cutthroat Flume
Customer - U.S. Department of the Interior - Bureau of Reclamation The Bureau of Reclamation was tasked with conducting a basin-wide effort to define the problems, identify solutions, and options relating to protecting and increasing water supplies and improving the health of a…
The Quiet Facts About Stilling Wells for Flumes and Weirs
Stilling wells are chambers isolated from, but connected to, the main flow of water in a flume, weir, or channel. Isolating the stilling well from the main flow via a small connector dampens or quiets the body of water in stilling well, while still allowing it follow the…
8 Simple Steps to a Worry-free Flume Installation
Regardless as to which flume you are installing, there are general guidelines that apply to any installation. By following 8 simple steps you can avoid many of the problems that occur when flumes are installed. The approach flow should be sub-critical, tranquil, and…
Parshall Flumes: Flat vs Radius Inlet Wing Walls
The most common method of transitioning flow from a channel into a Parshall flume is through the use of 45° inlet wing walls. The approach is straight-forwarded and the installation simple, but is it correct? Research and field experience has shown that both flat…
How Durable is a Fiberglass (FRP) Flume Anyway?
Time and again the question arises: how durable is a fiberglass flume anyway? To understand the answer, it is important to understand the nature of fiberglass. Fiberglass (aka glass-reinforced plastic, glass-fiber reinforced plastic, glasfaserverstärkter…
Baffled by (Weir) Baffle Plates?
Weir boxes are frequently fabricated without the use of a baffle upstream of the point of measurement. The omission of a baffle plate (sometimes called surge plates) saves both space and money, but at what cost? In applications where the velocity profile is normal and…
Partial to Parshall Flumes?
Since its development at the beginning of the last century, the Parshall flume has proven to be a versatile and long-lived invention for the measurement of water in open channels. More Parshall flumes are sold for water measurement than all other flume types…
What's a Nested (Dual-Range) Flume?
Whether you call them nested, dual-range, or flume reducer inserts (and we've heard them all), nested flumes are an innovative solution to the problem of measure two substantially different flow ranges over time. By nesting a small, lower flow rate flume inside of a…
How to Read a Parshall Flume
One of the advantages of the Parshall flume is how easy it is to use! Unlike Palmer-Bowlus or RBC flumes, there are no zero height offsets to worry about. Just inspect the flume, find the point of measurement, and stick / gauge to the bottom of the flume. Under…
How Does an Ultrasonic Flow Meter Work?
Ultrasonic flow meters measure the level in a channel by transmitting a pulse of sound from the face of the sensor to the surface of the flow stream and measuring the time for the echo to return. The transit time corresponds to the distance between the face of the sensor…
What is a Flow Metering Manhole Anyway?
Reduced to its most basic elements, a Metering Manhole is a composite (FRP) manhole with a factory integrated flow element to measure the flow of water in a pipe. Most Metering Manholes integrate flumes (typically Parshalls), although weirs and magnetic flow meters can also…
Sections Of A Flow Measuring Flume - Their Location and Function
In order to better understand flumes and how they can be applied to the measurement of flows in open channels it is useful to understand the sections of a flume and their specific functions.
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