Stage-Discharge Relationship for Sharp-Crested Rectangular Slit Weirs
Publication: Journal of Irrigation and Drainage Engineering
Volume 145, Issue 10
Abstract
Sharp-crested slit weirs are used for measuring small flow discharges. Different stage-discharge relationships can be found in the literature for computing the flow discharge of sharp-crested slit weirs. In this study, the performances of different available stage-discharge relationships are discussed using experimental data available in the literature. The flow process of a sharp-crested slit weir was analyzed based on the dimensional analysis theorem. The deduced stage-discharge equation was calibrated using the available experimental data for slit weirs with contraction ratios ranging from 0.017 to 0.25. The deduced stage-discharge relationship allowed measuring discharge values with an average error of 1.02% and a maximum error of 4.6%. The results of this study indicate that while weir Reynolds number is a predominant quantity affecting the flow discharge of rectangular slit weirs, the contraction ratio is a predominant quantity for contracted weirs. At the cost of less accuracy, an overall solution is presented in terms of the contraction ratio, which is applicable for slit, contracted, and suppressed weirs.
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Data Availability Statement
No models or codes were used during the study. All data used during this study appeared in Ferro and Aydin (2018a).
References
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Published In
Journal of Irrigation and Drainage Engineering
Volume 145 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Dec 7, 2018
Accepted: Jun 4, 2019
Published online: Aug 5, 2019
Published in print: Oct 1, 2019
Discussion open until: Jan 5, 2020
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