Enforcement Rules for Water Act Article 54

The “emergency measure for flood control” depicted in the first paragraph, Article 76 of the Act applies to the period commencing from the issuance of a torrential rain warning or typhoon warnings by the Central Weather Administration and continuing until the authority-in-charge has completed the necessary emergency measures to restore waterway protection to a condition posing no threat to public safety.The period of requisition prescribed in the first paragraph of Article 76 of this Act shall not exceed three months.
中文原文 水利法施行細則第54條
本法第七十六條第一項所稱防汛緊急時,指交通部中央氣象署發布豪雨特報或颱風警報起,至主管機關辦理緊急處置使水道防護恢復至無影響安全之虞所需之期間。
本法第七十六條第一項規定之徵用,其期間最長不得逾三個月。

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