Blog

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!

With Free Flow, Inc. (formerly of Gretna, NE) closing at the end of 2012, Openchannelflow would like to extend a welcome to its former customers who are in need of assistance with their flow monitoring needs. Openchannelflow offers these as well as many other products for the…

Sometimes measuring discharge from lakes and ponds can be challenging…particularly when there isn’t a convenient spot to put a discharge weir or flume.

Weir Boxes are the preferred method of monitoring seeps from concrete and earthern dams. Their ability to meaure low flows and retain sediment for future investigation make them a natural choice for the application. The small foot print and ability to have differnt inlet / outlet…

One problem application we see time and time again is measuring the flow out of a UV disinfection system. To keep the UV bulbs cooled and to increase the treatment efficiency of the disinfection system, usually the UV system provided has V-shaped overflow weirs just downstream of…

The three most common devices used to measure water rights are: Parshall flumes, V-notch weirs, and Cutthroat flumes respectively. But this doesn’t mean that other devices are used or aren’t suitable for measuring water right flows!

Fiberglass Packaged Metering Manholes are a great solution to the problem of measuring piped flows below grade and provide a unique set of benefits to consulting engineers who specify them. Accuracy, in this context means, installation accuracy by the contractor and the flow…

Every year at Openchannelflow we talk with several hundred consultants, researchers, contractors and end-users about their flow monitoring needs. Because we work extremely hard at answering all questions "flow” on this web site – and this blog in particular - we are often…

Many people confuse a flume’s resolution with its accuracy and use the terms interchangeably. The two, however, are distinct from each other. A flume may have good resolution, but poor accuracy, and vice versa. Resolution is a how much change in head is developed in the flume…

For flume and weir applications where the flow entering the device may not be as well distributed as one would like / or where the velocity profile needs adjustment, perforated baffle plates can be a good choice. Used in a series of two or more, perforated baffle plates help…

Warner College of Natural Resources - Colorado State University Warner College of Natural Resources (WCNR) at Colorado State University (CSU) is the largest named and most comprehensive natural resources program in the United States. WCNR serves as a leading institution in the…

Thin-Plate Weirs, when properly installed and maintained, are one of the most accurate means of measuring open channel flows. Under field conditions, though, without proper sizing or regular maintenance a thin-plate weir will become increasingly less accurate over time.