Enforcement Rules for Water Act Article 21
The “natural navigation waterway” depicted in the second paragraph, Article 27 of the Act does not include waterway that was once canalized or had construction work performed to facilitate navigation.
中文原文 水利法施行細則第21條
本法第二十七條第二項所定天然通航水道，不包括該水道曾經施以渠化或其他增加通航便利之工事者。