Cutthroat Measurement Flume Calibration for Free and Submerged Flow Using a Single Equation
Publication: Journal of Irrigation and Drainage Engineering
Volume 134, Issue 4
Abstract
A series of detailed laboratory measurements were made under steady-state flow conditions through a 0.914-m (3-ft) Cutthroat flume in an attempt to more accurately define transition submergence for four standard throat widths. It was found that the change from free to submerged flow, and vice versa, is gradual and that there is no easily observable transition point. The gradual transition between the flow regimes suggested a new calibration approach in which a single equation could more elegantly and more accurately fit the laboratory measurements, eschewing the need for separate free- and submerged-flow equations, and obviating the need to define transition submergence. Such an equation was found, providing greater calibration accuracy up to 95% submergence in 0.914-m Cutthroat flumes.
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Acknowledgments
This research was supported by the Utah Agricultural Experiment Station, project AES 788, and the Utah Water Research Laboratory, Logan, Utah.
References
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Skogerboe, G. V., Hyatt, L., Anderson, R., and Eggleston, K. (1967). Design and calibration of submerged open channels flow measurement structures. Part 3—Cutthroat flumes, Utah State University Press, Utah Water Research Laboratory, College of Engineering, Logan, Utah.
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© 2008 ASCE.
History
Received: Mar 15, 2007
Accepted: Oct 30, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
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