水閘是建於河道、水庫和湖泊中的一種擋水和泄水建築物，主體為閘室，設有閘門，用於控制河流流速[1]。關閉閘門，可以阻擋洪水，也可以使上游水位增高，便於通航。開放閘門，則可以方便洩洪[2]。
參考文獻
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
