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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Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Prefabricated inlet and inline box type flashboard risers.
Commercially available structures offer either stacked flashboard risers or
  floats to adjust this water level.
Flashboard type risers can be full-round pipe risers or half-round pipe risers.
The flashboard structure consists of wooden boards that are fastened to the dam
  by metal brackets.
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