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tumbling-bay
tumbling-bay n. 
/ˈtʌmbl̩ɪŋbeɪ/,
Brit. /ˈtʌmblɪŋbeɪ/
, /ˈtʌmblɪŋbeɪ//ˈtʌmbl̩ɪŋbeɪ/U.S. /ˈtəmb(ə)lɪŋˌbeɪ/
an outfall from a river, canal, or reservoir; a weir; also, the pool into which the water falls from this./ˈtəmb(ə)lɪŋˌbeɪ/ΘΠ
the world > the earth > water > lake > pool > [noun] > lasher
lock pool1674
tumbling-bay1724
lasher1851
the world > the earth > water > lake > pool > [noun] > artificially confined water
weirc897
dama1340
millpond1371
pound1535
pent1587
water-shut1613
tumbling-bay1724
backwater1788
pen pond1904
the world > the earth > water > rivers and streams > tributary > [noun] > outfall
effluent1860
tumbling-bay1891
1724 Jrnl. House of Commons 20 382/1 The water is to be divided by an over-fall or tumbling-bay.
1795 J. Phillips Gen. Hist. Inland Navigation (rev. ed.) Add. 90 To preserve the water of the same river, a tumbling bay is to be erected.
1847 C. G. Addison Treat. Law Contracts (1883) ii. i. §1. 244 The lessee of a water-mill..has no right to alter the height of the tumbling-bay.
1891 A. J. Foster Ouse 136 A fine large ‘tumbling bay’, as the pools below the sluices are sometimes called.
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