flash board

flashboard

[flash-bawrd, -bohrd]
noun Civil Engineering.
a board, or one of a series of boards, as on a milldam, used to increase the depth of the impounded water.

Origin:
1760–70; flash + board

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World English Dictionary
flashboard (ˈflæʃˌbɔːd)
 
n
stop log, Also called: stop plank a board or boarding that is placed along the top of a dam to increase its height and capacity

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