Kunci air

Sebuah kunci air berhampiran kawasan Bagan Sekinchan, Selangor [Klik untuk pembesaran imej]

Kunci air

Sejenis sekat atau alat penahan air utk mengendalikan aliran air (dalam tali air, terusan, parit dan lain-lain)

[Sumber: DBP]

Sluice /slo͞os/

A sliding gate or other device for controlling the flow of water, esp. one in a lock gate.

Synonyms: lock - penstock - water gate - flood gate

[Ref: Google]

A sluice is a water channel that is controlled at its head by a gate (from the Dutch word 'sluis'). For example, a millrace is a sluice that channels water toward a water mill. The terms "sluice gate", "knife gate", and "slide gate" are used interchangeably in the water / wastewater control industry.

A sluice gate is traditionally a wooden or metal plate that slides in grooves in the sides of the channel. Sluice gates are commonly used to control water levels and flow rates in rivers and canals.

[Ref: Wikipedia]