Discharge Coefficient of a Spillway with a Riser Perforated by Rectangular Orifices
Publication: Journal of Irrigation and Drainage Engineering
Volume 145, Issue 11
Abstract
Perforated riser principal spillways are widely used in check dams, and rectangular orifices are the preferred orifice geometry for risers constructed of brick. However, there is little research based on risers perforated with rectangular orifices. This paper discusses the discharge coefficient of such a structure, based on the experimental data and data collected from literature, during which an estimation of the discharge equations for a riser perforated with circular orifices was made. First, an existing equation for a riser with circular orifices is selected based on the coefficient of determination () index and the Nash–Sutcliffe efficiency (NSE) index. Then, an equation for the discharge coefficient of a riser perforated with rectangular orifices is proposed (, ) considering the factors of the diameter of the riser pipe, the width of the rectangular orifice, and the head over the centerline of the orifice. This work is expected to provide a reference for the design and investigation of a perforated riser principal spillway.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the submitted article.
Acknowledgments
This work was supported by the National Key Research and Development Program of China (2016YFC0402404) and the National Natural Science Foundation of China (51679197, 41330858, and 51679193).
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Journal of Irrigation and Drainage Engineering
Volume 145 • Issue 11 • November 2019
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©2019 American Society of Civil Engineers.
History
Received: Aug 23, 2018
Accepted: Jul 9, 2019
Published online: Aug 20, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 20, 2020
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