Discharge Characteristics of Weir-Orifice and Weir-Gate Structures
Publication: Journal of Irrigation and Drainage Engineering
Volume 145, Issue 11
Abstract
The discharge characteristics of flow over and under different weir-gate structures were investigated using dimensional analysis and multivariable regression techniques. Based on the shape and geometry of weir-gates, seven weir-gate structures were classified. The interaction factor, defined as the ratio of the measured discharge over and under the weir-gate structure to the sum of the predicted weir and gate discharges from the literature, was calculated for all types of weir-gate models. Six weir-gate models were experimentally tested to study the discharge characteristics of flow over weirs of finite crest length and under gate. The interaction factors were correlated with the geometry parameters for all weir-gate models with an average coefficient of determination of 0.85. A series of regime plots was developed to assist designing the weir-gate structures as flow distributors for a sharp-crested weir-gate and a weir of finite crest length with an offset. The regime plots show the contribution of weir and gate discharges for different weir-gate geometries. A critical normalized head was introduced as the flow through the weir-gate structure is equally divided by the weir and gate. Based on the weir-gate geometry and discharge, general empirical equations were developed to estimate the critical normalized head for practical engineering applications.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (head-discharge data).
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©2019 American Society of Civil Engineers.
History
Received: Dec 3, 2018
Accepted: Jun 19, 2019
Published online: Aug 28, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 28, 2020
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