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A Packaged Metering Manhole (PMM) is a fiberglass manhole into which a primary device has been integrated. In addition to the above, Packaged Metering Manholes allow the integration of primary devices larger than would otherwise be able to be easily accommodated in concrete…

One of the most common uses of flumes today is to measure sanitary flows; whether this is at an industrial discharge, mobile home park, resort, or wastewater treatment plant. Unfortunately, flumes are often selected bsed solely on their ability to handle anticipated flows –…

There are two conditions of flow that can occur in a Parshall Flume: Free-flow occurs in a flume when there is insufficient backwater to reduce the discharge through the flume. The primary advantage of free-flow is that the level only needs to be measured at a single point (the…

Flumes installed in earthen channels frequently experience the problems of upstream flow bypass and downstream scour.

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 high mountain watershed.

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 steady…

Regardless as to which flume you are installing, there are general guidelines that apply to any installation. With these steps in mind, you are on your way to a trouble-free flume installation!

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-forward and the installation simple, but is it correct?

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 kunststoff , FRP,…

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 combined.

Metering manholes are a convenient way to measure flows in a wide range of applications, including: wastewater treatment plant headworks / influent, treated effluent, in-plant flows, industrial discharge, or monitoring the flow of sewage in a collection system. Capable of…

Whether you call them nested, dual-range, or flume reducer inserts, 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 larger, higher flow rate flume; both…