Sluice
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A sluice is a water channel containing a sluice gate, a type of lock to manage water flow and water level. There are various types of sluice gates, including flap sluice gates and fan gates.
A sluice gate
Xihe Regulating Sluice in Yangliuqing Town, Xiqing District, Tianjin Municipality
A small wooden sluice in Magome, Japan, used to power a waterwheel
Sluice gates near Henley, on the River Thames
Weir
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A weir, or low-head dam is a barrier across the width of a body of water that alters the flow characteristics of water and usually results in a change in the height of the water level. Weirs are used
Sluice
…a type of lock to manage the water flow and water level. When a sluice is lowered, water may spill over the top, in which case the gate operates as a weir. Usually, a mechanism drives the sluice up or down. This may be a simple, hand-operated, chain pulled/lowered, worm drive or rack-and-pinion drive, or…
A weir on the Humber River near Cruikshank Park in Toronto, Ontario, Canada
A weir on the Yass River, New South Wales, Australia, directly upstream from a shared pedestrian-bicycle river crossing
A weir on the Tikkurilankoski rapids in Vantaa, Finland
The broad crested weir at the Thorp grist mill in Thorp, Washington, US