Regulations prohibit the construction of houses and the dumping of waste in water-flow areas so that the rivers will not lose their adjusting function during the flood season.
依「水利法」第七十八條第一款規定，行水區內不准建築房屋、亂倒廢土及垃圾… …，以免河道淤積，在洪水季節失去調節水量的功能。