tumbling bay

1) The OED offers several meanings for this term, and has examples from 1724 and 1795. It could be an outfall from a canal, river or reservoir; a weir, or even the pool into which water falls from a dam.

The details in a Honley agreement of 1796 describe such a feature clearly and they are supported by a plan. One of the parties agreed to clear away a tunnel above the old weir … and … make a new Stone weir or tumbling bay south of his mill six yards in length and of the height of the said old weir .

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