Residents of villages along the banks of the Tachia River that are being rebuilt after the 9 / 21 earthquake and Typhoon Mindulle in 2004 live in fear of typhoons and torrential rains. The landslides caused by such weather wash away bridges and leave the villages cut off from the outside world. In very bad cases, the mud and boulders can bring down houses and leave casualties.
921 地震加上 2004 年 72 水災的重創，幾乎每逢颱風豪雨，大甲溪沿岸的部落居民就日夜不安；豪雨挾帶的土石流輕則造成橋樑沖毀、聯外交通中斷，重則黃泥和巨石齊下，造成屋毀人亡。