Piano Key Weir Submergence in Channel Applications
Publication: Journal of Hydraulic Engineering
Volume 138, Issue 7
Abstract
Weir submergence can influence head-discharge relationships for weirs used in channel applications when high tailwater conditions exist owing to a downstream control. Weir submergence describes a condition in which the water level downstream of the weir exceeds the weir crest elevation. When a weir becomes submerged, the driving head required to pass a specific discharge over the weir can increase significantly relative to a free-flow condition. In this study, the effects of tailwater submergence on laboratory-scale piano key weir head-discharge relationships were evaluated experimentally and compared with previously published data for labyrinth and sharp-crested linear weir submergence. The results of this comparison show that for relatively low levels of submergence, the piano key weir requires less upstream head relative to the labyrinth weir to pass a given discharge. This increase in efficiency was minimal () and was reversed at higher submergence levels.
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Acknowledgments
Funding for this study was provided by the state of Utah and the Utah Water Research Laboratory (Utah State University).
References
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 138 • Issue 7 • July 2012
Pages: 661 - 666
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Oct 19, 2011
Accepted: Jan 18, 2012
Published online: Jan 20, 2012
Published in print: Jul 1, 2012
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