Blog

We've collected a series of photos exclusively showing fiberglass Parshall flumes in a variety of different sizes. We're visual people and prefer pictures over words. 18" Parshal Flume with Inlet Wing Walls [sandwiched between (2) 12" Parshall Flumes]

When investigating a flume’s operation, one thing to look for is the presence of submergence. Certain visual clues can help an operator to make informed assumptions regarding a flume’s performance.

The old adage of taking measuring twice and cutting once has never been so appropriate as it is when determining the depth of a fiberglass manhole. Although fiberglass manholes (FRP) posses a wealth of benefits; modularity is not one of them. Because all of the elements are…

Sometimes we come across an installation in the field where we want to show you have others have solved problems that you may be wrestling with. On a recent site visit, a customer showed us a discharge chute that they had developed to minimize erosion downstream of their Parshall…

Openchannelflow is please to announce the addition of a new section to the web site: Palmer Bowlus Flumes! The section wil be full of the same high quality research and information on Palmer Bowlus flumes that you have come to expect from our other flume products. Over the next…

In our recent series …Ways to Screw Up a Flume Installation we highlighted some of the more common (or comical) ways we have seen flume installations go awry. Now we’d like to show you some of the ones that were done right.

When we wrote our article on Ways to Screw Up a Flume Installation, and its companion piece More Ways to Screw Up a Flume Installation, we touched on some of the basic ways that an installation can go awry. Those lists, like the one following, were not intended to cover every…

When we wrote our article on Ways to Screw Up a Flume Installation, we touched on some of the basic ways that an installation can go awry. Many of the possibilities mentioned came from the installation conditions. Here we delve into more of the application errors and deliberate…

There are any numbers of ways to screw up the installation of a flume. Below are just some of them. The centerline of the flume should be along the centerline of the flow stream to be measured. Without flow conditioners, flow that this off angle to the centerline of the flume…

Bubbler flow meters can be an excellent flow meter choice when measuring flows in flumes or weir boxes. They are unaffected by wind, foam, steam, and floating solids and provide a high level of measurement accuracy. Adapting bubbler meters for use with flumes and weir boxes is…

Fiberglass Diversion Manholes are way of controlling open channel flows in a factory integrated design. Utilizing the core design of our standard fiberglass manholes, Diversion Manholes provide corrosion resistance, speed of installation, and ease of use. A variety of flow…

H Flumes are one of the more versatile styles of flume when it comes to customization for site conditions. Versatility with the approach section length / layout mean that a wide variety of inlet conditions can be accomodated. While on the outlet side, drop box structures can…

One of the oft-mentioned benefits Packaged Metering Manholes is the ability to integrate flumes and other structures that are larger than the manhole barrel diameter, but what exactly does this mean? For below grade applications – typically sanitary sewer mains or…

As we’ve seen before in our comparison of H-flume and Parshall flume manufacturers, not all “equal” products are just that…equal.

Drop-in-place Solution for Storm Water Flow Measurement and Control Lonza Mapleton specializes in intermediate chemical products for the hygiene, water treatment, and materials protection markets. The plant manufactures a wide range of long chain alkly chlorides, amines, and…

When we talk of “or equal” what exactly does that mean when we are talking about fiberglass Parshall flumes?

To some people a flume, is a flume, is a flume. They are all based on the same dimensional standards, so it doesn’t really make a difference who makes it. Right? We were recently sent photos of an H Flume installation at a commercial laundry. The flume was completely…

One question we get asked time and time again is: do I need fiberglass / galvanized / stainless steel wing walls for my fiberglass / galvanized / stainless steel flume or can I just form them on my own? The short answer is no, they don’t need to be made of the same material as…

Years ago the Thompson Pipe & Steel Company in Denver, CO manufactured knock-down Parshall flumes for use in water rights / irrigation flow measurement – selling quite a number throughout the Rocky Mountain region. Thompson has long since exited this market and now many of…

The key to an accurate weir installation is the correctly sizing the upstream weir pool. To guarantee a successful weir installation, just keep these 9 easy steps in mind!