spill box

noun

Definition of spill box

: a device for maintaining a constant head or pressure on a measuring weir or orifice specifically : a short flume with long wells at each end and a spillway over which the excess water flows

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“Spill box.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spill%20box. Accessed 11 May. 2021.

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