Water Act Article 77

During a flood control season, the agency in charge of flood control may command the assistance of local authorities along a river. In case of emergency, local authorities should mobilize civilians to guard river banks immediately.
中文原文 水利法第77條
辦理防汛機關,於防汛期間,得指揮沿河地方主管機關協助,遇有緊急情形時,地方主管機關應即發動民力,駐堤協防。

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