Water Act Article 51

When the construction of a water work has an impact on flood control, the authority-in-charge may order the proprietor to construct proper flood control structures.
中文原文 水利法第51條
興辦水利事業,有影響於水患之防禦者,主管機關得令興辦水利事業人建造適當之防災建造物。

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