Water Act Article 8

Any water work undertaken by a municipal or county (city) government and having impacts on two or more municipalities or counties (cities) shall be approved by the central authority-in-charge.
中文原文 水利法第8條
直轄市或縣(市)政府辦理水利事業,其利害涉及二直轄市、縣(市)以上者,應經中央主管機關核准。

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