Assessing Stage-Discharge Relationships for Circular Overflow Structure
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 144, Issue 1
Abstract
Circular overflow structures are used in irrigation and drainage networks as water measuring structures. Different approaches can be found in the literature to formulate the stage-discharge relationship of the circular weir. They are mainly categorized in three groups: (1) methods trying to simplify the complex elliptic integrals coming from the theoretical discharge equation; (2) methods that use the orifice formula and a discharge coefficient specific for the circular weir; and (3) approaches using dimensional analysis and Buckingham’s Theorem. In this study, a nondimensional stage-discharge formula was obtained using Buckingham’s Theorem to define the flow over the sharp-crested circular weir. Then the current available methods and experimental data from the literature were employed to calibrate the theoretically deduced stage-discharge relationship. The effect of the approach channel on the stage-discharge formula was also investigated using the experimental data available in the literature. Finally, the performances of different stage-discharge relationships are discussed and practical suggestions are provided.
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©2017 American Society of Civil Engineers.
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Received: Feb 23, 2017
Accepted: Jun 7, 2017
Published online: Oct 24, 2017
Published in print: Jan 1, 2018
Discussion open until: Mar 24, 2018
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