(US) A board placed temporarily upon a dam, river, stream, etc. (typically within a permanent frame) to raise the water above its usual level.
A form of cheap open weir which has been commonly constructed in the West is the open wooden frame and flashboard weir.
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(by extension) A board that controls the flow of any material.
The railing at the upstream side also serves as a guide and a support for the manually operated hoist for the flashboard placement and removal.
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(physics) A sheet of material that is subjected to an electric pulse or flashover in order to produce plasma.
Although flashboards are designed to fail when reservoir level rises rapidly to an elevation greater than the flashboards, NPI states that most flashboard' failures occur as a result of debris or ice hitting the flashboards'.
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