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needle dam

noun
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Definition of needle dam

: a barrier consisting of horizontal bars dropped into grooves in the abutments of a pass through a dam or of planks set on end and removable in case of flood

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“Needle dam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/needle%20dam. Accessed 4 Jul. 2020.

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