Abstract
Vertical sluice gates are widely used for flow control in irrigation and drainage channels. When the opening is smaller than the critical depth, the flow immediately downstream of the gate will be supercritical. Flows through the gate may be free or submerged depending on the tailwater depth. This paper investigates various characteristics of a vertical sluice gate in a rectangular flatbed channel. Equations for discharge coefficient, dimensionless discharge, submerged water depth, maximum allowable gate opening, and the distinguishing condition separating free flow and submerged flow were derived and plotted with consideration of flow contraction at the gate. The distinguishing condition was found to be a function of the contraction coefficient, upstream water depth and tailwater depth, and was verified through laboratory experiments.
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