The Collaborative International Dictionary
Flashboard \Flash"board`\, n. A board placed temporarily upon a milldam, to raise the water in the pond above its usual level; a flushboard. [U.S.]
Wiktionary
alt. (context US English) A board placed temporarily upon a milldam, to raise the water in the pond above its usual level. n. (context US English) A board placed temporarily upon a milldam, to raise the water in the pond above its usual level.
WordNet
n. boarding place along the top of a dam to increase its height [syn: flashboarding]
Usage examples of "flashboard".
Dundee dam are probably due to the carrying away of the flashboards which are placed upon the dam crest in times of low water.
The flashboards used upon this dam are usually 18 inches wide, and as they are supported by iron rods, which are of approximately the same strength and are placed upon the dam by one crew of workmen, it may be safely assumed that they are of approximately equal stability and might be expected to fail almost simultaneously along the length of the dam crest.