English to English

noun (n)

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

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

  source: wordnet30
• a gate upstream from a lock or canal that is used to control the flow of water at the upper end(noun.artifact)

  source: wordnet30