Abstract
An analysis is given of the application of inviscid fluid theory to the flow about a flat plate in a channel. An analogy is drawn, likening the plate to both an orifice and a wall. In this way the analytical results are related to flow past a sluice gate, or similar flat obstruction, normal to a stream, giving pressures, and drag and contraction coefficients over such a body. Experimental work carried out in a water tunnel illustrates the limits of application of the approach, showing where scale modelling needs to take particular account of the prototype situation.

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