Sluice (noun)

A channel or conduit through which water is conducted, especially a sloping trough or chute with a gate for controlling the flow of water.

Origin:

Middle english, from old english slūs; akin to old high german slūz sluice.

Examples:

1. Water was released from the sluice to flood the fields.
2. The sluice gates were opened to let the water through.
3. The sluice is used to control the water level in the canal.
4. The sluice is important for irrigation.
5. The sluice is a way to control the flow of water in a waterway.