Correction for Settlement in Submerged Parshall Flumes
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 3
Abstract
A commercially available 30.5‐cm (1‐ft) Parshall flume was installed in the recirculating flume in the hydraulic laboratory of Colorado State University and tested for lateral‐slope or cross‐slope settlement. A series of 11 tests were conducted with the flume for cross slopes of ±3%, and for submerged outfall conditions. The results indicated that the Parshall flume accuracy is slope and submergence dependent. The flume rating was in error 3%, 5%, and 11% for 70%, 80%, and 90% of submergence, respectively, for lateral settlement of ±2%. The accuracy of the Parshall flume is reduced as the cross slope deviates from the horizontal. A method for correcting the flow rating for lateral settlement is presented as a function of the flume cross slope. A correction factor for submergence is incorporated into the discharge rating equation. Extrapolation of these results beyond cross slopes of 3% is not recommended. These results are applicable only to submerged conditions.
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References
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 120 • Issue 3 • May 1994
Pages: 676 - 682
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: May 25, 1983
Published online: May 1, 1994
Published in print: May 1994
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