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ARS Home » Pacific West Area » Maricopa, Arizona » U.S. Arid Land Agricultural Research Center » Water Management and Conservation Research » Research » Publications at this Location » Publication #168997


item Clemmens, Albert

Submitted to: Journal of Irrigation and Drainage Engineering
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/1/2004
Publication Date: 9/1/2004
Citation: Clemmens, A.J. 2004. Discussion of "transition effects in flow over side weirs". Journal of Irrigation and Drainage Engineering. 131(4):392

Interpretive Summary: Measurement of water flow rate is important for many water resource situations, particularly in the arid west where water supplies are limited. Canal and flood control structures often use side weirs to protect the canal from overtopping or to divide the flow of water. Design of these channels is dependent on the characteristics of these side weirs. This discussion refutes a published method that has been proposed for determining the flow characteristics of these side weirs. This should be of interest to flood-control districts, the Army Corp of Engineers, the Bureau of Reclamation and consulting engineers.

Technical Abstract: In the published article, the authors present developments in the use of a head-discharge relationship for side weirs. Unfortunately, this relationship is based on an erroneous development in prior works by the authors. They start with a relationship from prior research by others which assumes that the weir crest is at the bottom of the channel. They then apply this relationship to side weirs that are well above the channel bottom. As a result, the relationships developed are not generally valid and I do not recommend their use.