Water Act Article 54-2

A reservoir storage area shall be managed by its proprietor or a management agency (entity) entrusted by the proprietor. The central authority-in-charge will prescribe the measure for the use and management of reservoir, boundaries of storage area, approval announcement procedure, and other provisions.
中文原文 水利法第54-2條
水庫蓄水範圍由興辦人或其委託管理機關(構)管理之。
其使用管理、蓄水範圍之界限與核定公告程序及其他應遵行事項之辦法,由中央主管機關定之。

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