Enforcement Rules for Water Act Article 48

Water that flows into the waterway system after being used by the original water right holder may be reutilized by the same water right holder or others. However the water user shall register his water right according to the Act.
中文原文 水利法施行細則第48條
原水權人利用後之水進入水道系統,原水權人或他人得再利用,並應依本法辦理水權登記。

English translation for reference only; the Chinese text prevails. Not legal advice.