Discharge Coefficient of a Circular-Crested Side Weir in Rectangular Channels
Publication: Journal of Irrigation and Drainage Engineering
Volume 142, Issue 6
Abstract
Side weirs are frequently used for water-level control in irrigation systems, sewer networks, and flood protection. Researches on side weirs have generally focused on determining the hydraulic characteristics of sharp-crested side weirs. A common type of this weir, which has larger capacity to pass the flow, is the circular-crested weir. To the authors’ knowledge, investigation of hydraulic features of this weir as side weir has been ignored in literature. Based on an experimental model for subcritical flow conditions and under the hypothesis of constant specific energy, the hydraulic characteristics of the circular-crested side weir with various weir heights, widths, and downstream slopes are taken into account to formulate an expression for the discharge coefficient. The results indicate that the upstream Froude number, the weir height to weir length, specific energy to the weir radius, and downstream slope of the weir are the important variables that affect the discharge coefficient of circular-crested side weirs. A comparison between circular-crested and sharp-crested side weirs confirms that circular-crested side weirs are more economical and efficient than sharp-crested side weirs, due to the greater discharge coefficient.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 142 • Issue 6 • June 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 14, 2015
Accepted: Dec 28, 2015
Published online: Mar 16, 2016
Published in print: Jun 1, 2016
Discussion open until: Aug 16, 2016
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