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One problem that we see again and again is how to measure open channel flow in partially full pipes.  For applications where a device can extend off the end of the pipe a number of solutions are used, including:  California pipe (which is extends  vertically up…

Recently an industrial customer of Openchannelflow installed one of our fiberglass Packaged Metering Manholes and documented the steps involved in its installation. The Packaged Metering Manhole is located next to the customer’s loading docks, so a traffic loaded (H-20) top…

Parshall flumes are a class of short throated flumes.  Originally developed in the 1920's, the Parshall flume has become the most researched style of flume leading to its wide acceptance and use in a variety of applications.  In North America, the Parshall flume is…

In our blogs, we frequently highlight our abilities as a:  "...manufacturer of primary devices, including Parshall flumes, for the devices for the measurement, conditioning, and control of water in open channels..."   But what does it actually mean to be a Parshall…

While it is desirable for a flume to have free, unimpeded discharge, it can be difficult to guarantee this under all flow conditions.  H Type flumes have particularly low resistance to submergence, with submergence transitions of only 30%. The submergence transition of an H…

As man’s need to use and measure water has increased, a number of different and varied methods have been developed to measure the flow of water in open channels.   Some of the more common methods currently in use to measure open channel flows are: Timed Gravimetric…

When we think of steel flumes - whether they be Parshall, Cutthroat, or H type – we are concerned with both the high (stainless) and low (galvanized) end of the market. While fabrication techniques are identical, the applications for steel flumes differ considerably.

On September 1st, 2014 Teledyne-ISCO released their 7th edition of the Teledyne ISCO Open Channel Flow Measurement Handbook.  Originally published in 1979, the handbook has been updated multiple times over the years and has become an invaluable resource for those in the…

The 120-inch Parshall Flume is the second largest of the prefabricated Parshall flumes available. The flume is used to measure larger surface water flows, primary water rights channels, and flows at larger wastewater treatment plants. The size of the flume is such that it must…

The primary uses of the 96-inch Parshall Flume are to either measure surface waters (watersheds / catchments / water rights) or sewage flows at wastewater treatment plants. Like the other large Parshalls, the 96-inch Parshall Flume ships in two pieces for field assembly.

At industrial sites where a Packaged Metering Manhole has been installed it is quite common to see a Parshall flume integrated into the manhole. As part of a site visit to assist a local customer, Openchannelflow personnel took the video below to help visualize what a Parshall…