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weir basin

noun
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Definition of weir basin

: a wide approach to the upstream side of an irrigation weir constructed so as to reduce to a minimum the effect of the momentum of the approaching water on the flow over the weir

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“Weir basin.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/weir%20basin. Accessed 10 December 2019.

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