Water Act Article 80

Reeds, aquatic grasses, willows or other vegetations growing in the area between a dike and river banks and having the utility of wind and wave control, regardless of being privately or publicly owned, shall not be mowed down without permission unless off the flood control season or with permission from the authority-in-charge.
中文原文 水利法第80條
堤址至河岸區域內栽種之蘆葦、茭草、楊柳或其他草木,有防止風浪之功效者,無論公有、私有,非在防汎期後,不得任意採伐。
但經主管機關核准者,不在此限。

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