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flood dam

noun
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variants: or less commonly flooding dam

Definition of flood dam

: a dam to store floodwaters temporarily or to supply a surge of water (as for clearing a channel or splashing logs) — compare splash dam

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“Flood dam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flood%20dam. Accessed 24 Oct. 2020.

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