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sluice

Anything that resembles a water slide with a gate is a sluice — a narrow channel that controls water flow.

The word originally comes from an old English word meaning a narrow channel that controlled a flow of water, usually to a watermill, and it still has that meaning. A sluice can also mean a splash — often with cold water and usually done with some vigor. Torture victims in movies sometimes have their faces sluiced to bring them round for further questioning.

Definitions of sluice
  1. noun
    conduit that carries a rapid flow of water controlled by a sluicegate
    synonyms: penstock, sluiceway
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    type of:
    conduit
    a passage (a pipe or tunnel) through which water or electric wires can pass
  2. verb
    pour as if from a sluice
    “An aggressive tide sluiced across the barrier reef”
    synonyms: sluice down
  3. verb
    irrigate with water from a sluice
    sluice the earth”
    synonyms: flush
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    type of:
    douse, dowse, drench, soak, sop, souse
    cover with liquid; pour liquid onto
  4. verb
    draw through a sluice
    sluice water”
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    type of:
    draw, take out
    take liquid out of a container or well
  5. verb
    transport in or send down a sluice
    sluice logs”
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    type of:
    transport
    move something or somebody around; usually over long distances
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