The theory of flow through a lateral conduit outlet has been adopted to derive an expression for the discharge coefficient of the flow through a lateral weir set in a rectangular channel. The theoretical expressions hold good for subcritical flow in the channel upstream of the weir. The experimental data obtained in a test flume provide a verification of the theoretical relationships between the geometric and fluid dynamic parameters of the weir flow. The proposed relationships are valid for flow through lateral weirs that can be as wide as the parent channel.
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Ramamurthy et al. (1980) studied this question.