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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?

As we’ve seen before in our comparison of H-flume and Parshall flume manufacturers, not all “equal” products are just that…equal. Here we compare the construction details of Packaged Metering Manholes.  Packaged Metering Manholes take proven open…

Customer - Lonza Mapleton AMEC in Peoria, IL approached Openchannelflow with a unique application:  an industrial customer of theirs needed to measure storm water flows in an existing earthen channel.   Find out how Openchannelflow helped AMEC solve their customers…

When we talk of “or equal” what exactly does that mean when we are talking about fiberglass Parshall flumes? To some, a Parshall flume is a Parshall flume, with little if any distinction made between manufacturers.  Naturally we don't feel the same.  We…

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? Wrong.  As you’ve heard before, the devil is in the details. 

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. The longer answer is a little more…

The key to an accurate weir installation is the correctly sizing the upstream weir pool.  You can guarantee a successful weir installation every time if you follow these nine easy steps! The approach channel should be straight and of uniform cross-section for a distance of…

The ultrasonic flow meter is one of the instrumentation workhorses for measuring open channel flows in general, and flumes in specific.  Ultrasonic flow meters are generally low cost, robust, and provide a reasonable level of accuracy (+/- 0.02’ for a head change of…

Customer - Solutia, Inc. a subsidiary of Eastman Chemical Company Solutia needed to measure interplant flows in several existing concrete channels.  The concrete channels had a protective coating for resistance to adipic acid and could not be modified.  Any flow…

Let’s be honest:  metering manholes (from an upfront, material cost standpoint) aren’t cheap.  While no one would argue that metering manholes don't provide substantial benefit to their users, part of what you are paying for is a unit that is ready for…

Using flumes to measure flows in cold climates brings a set of challenges not otherwise faced in warmer climate applications.  Some of the problems that can be encountered when using flumes in cold climates include: Blockage Submergence Frost heave Settling Flow bypass

The 2-inch Parshall Flume is the second smallest of the Parshall Flumes. Like the 1-inch, the small size means that it is somewhat limited in use. When used to measure sanitary flows, the flow entering the flume must be well screened, or it will clog. The 3-inch Parshall Flume is…

Customer – Konkola Copper Mines Plc, Zambia The Konkola mine is one of the wettest mines in the Zambian Copperbelt, with inflow volumes of approximately 400,000 m3 of water per day. The water from all pump stations is channeled through sumps for settling and sedimentation…

With Free Flow, Inc. (formerly of Gretna, NE) closing last year, Openchannelflow would like to extend a welcome to its former customers who are in need of assistance with their flow monitoring needs. Free Flow was primarily know for three product lines: Flumes (Parshall /…