SINCE 1828
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shutter dam

noun
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variants: or shutter weir

Definition of shutter dam

: a dam formerly consisting of one or more simple shutters or gates turning on a horizontal axis near the top and now consisting of a series of short pieces that revolve on their horizontal axes and are lowered to rest flatwise on the sill

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“Shutter dam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/shutter%20dam. Accessed 25 Jan. 2021.

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