Abstract
A series of laboratory experiments were carried out in a flow-measurement flume of a rectangular compound cross section to investigate the effect of the throat width and step height on the values of discharge coefficient, approach-velocity coefficient, and modular limit. For this reason, nine different models made of Plexiglas were tested in a horizontal laboratory flume for a large range of discharges. In each test, the head, h1 , over the crest elevation at depth-measurement section and head, h2 , over the crest elevation in the tailwater channel were measured. The calculated discharge coefficients, modular limits, and approach-velocity coefficients were related to relevant parameters. The consistency between aforementioned quantities and those given in the literature are found to be quite good. Modular limit values as high as 95% are obtained.
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