Staged Labyrinth Weir Hydraulics
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 139, Issue 11
Abstract
Labyrinth weirs with multiple crest elevations (i.e., staged labyrinth weirs) can be used in spillway design to confine base flows to a section of the crest and/or satisfy discharge hydrograph requirements. However, inadequate hydraulic design information is available specific to staged labyrinth weirs. In this study, the flow characteristics of various staged labyrinth weir configurations (laboratory-scale) were tested. Observations of staged labyrinth weir flow characteristics are presented. The influences of the lower stage length, depth, and location on discharge were studied and head-discharge relationships were experimentally determined. The accuracy of a head-discharge predictive technique on the basis of superposition and traditional labyrinth weir empirical data was also evaluated. Relative to the experimental results, the superposition technique estimations were generally within for all configurations tested except at lower headwater depths, where maximum estimation errors occurred (maximum of 15%). When discharge was limited to the lower stage weir segment, the predictive discharge errors were up to 20% for some notch configurations. This indicates the discharge of the lower stage segment is location-specific because of the complexity of the labyrinth weir geometry.
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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).
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Published In
Journal of Irrigation and Drainage Engineering
Volume 139 • Issue 11 • November 2013
Pages: 955 - 960
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 19, 2012
Accepted: May 20, 2013
Published online: May 22, 2013
Discussion open until: Oct 22, 2013
Published in print: Nov 1, 2013
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