流水，為水的動態。形成流水的地方包括河流、湖泊、溪澗、水龍頭流下來的自來水，甚至人工撥動的水流皆是流水。
流水之作用為水分所在地加添或去除元素，為水分帶來生命力，流水不腐[1]。若果為一潭死水的話，元素就會沉積、腐爛，使水分敗壞。
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