noun (n)

• regulator consisting of a valve or gate that controls the rate of water flow through a sluice(noun.artifact)

  Synonym:
  floodgate, head gate, sluice valve, sluicegate, water gate
  

  source: wordnet30
• conduit that carries a rapid flow of water controlled by a sluicegate(noun.artifact)

  Synonym:
  sluice, sluiceway
  

  source: wordnet30
• A close conduit or pipe for conducting water, as, to a water wheel, or for emptying a pond, or for domestic uses.(noun)

  source: webster1913