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The streamlines through a Parshall flume are assumed to be both parallel to the flume walls and continuous (Parshall 1936).  Many things can disrupt parallel streamlines as they enter the flume, including:  upstream debris, bank vegetation growing into the upstream…

For a short-throated flume to accurately measure flow, it is desirable to keep the flume’s dimensions with +/-2% of nominal.  But what happens when they aren’t?  For Rectangular Cutthroat flumes, investigations have shown that corrects for throat width can…

Recently research has conducted into the aeration efficiency of Parshall and Venturi flumes.  Unlike most other devices that are used to aerate river systems and which require stepped spillways or drop structures, Parshall flumes may be used to increase dissolved oxygen (DO)…

The 1-inch Parshall Flume is the smallest of the 22 standard Parshall flume sizes. The small size means that it is relatively limited in its use. 1-inch Parshall Flumes cannot be used on unscreened sanitary flows as they will clog. The 3-inch Parshall Flume is the smallest…

The 3-inch Parshall Flume is one of the last flumes developed in the Parshall series. The flume can be used equally well to measure sanitary flows as well as surface waters. It is important to note that the 3-inch Parshall flume is the smallest Parshall Flume size that can be…

The 9-inch Parshall Flume is a popular size in the Parshall Flume family. The flume is equally at home measuring surface waters, wastewater flows, and water rights.

The 12-inch Parshall Flume is one of the most popular sizes of the Parshall Flume family. The flume is equally at home measuring sanitary wastewater at a municipal treatment plant as it is measuring water rights on The Western Slope. Applications The flume is regularly used to…