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  1. In open channel flow, a manufactured conduit (usually rectangular in shape) with a portion having a constricted cross section, which may be used to control and measure streamflow.

  2. In geomorphology, a narrow, steep-sided valley.

  3. In hydraulics, a channel used for studying the flow of fluids under gravity. The fluid is pumped from a sump to a stilling tank that acts as a reservoir from which the fluid is discharged down the flume at varying speeds. The motion is viewed from above or through glass sides.

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