Large quantities of pervious pipes were therefore used to drain off ground water, and slope protection work and vegetation cover were required to prevent erosion. In the central area, rivers have longer flood seasons because of the mountainous topography and abundant rainfall.
中部山地雨量豐沛，溪流短促，河床比降又大，遇到山洪暴發時，水流急湍，衝擊破壞力很強，所以施工時打樁、吊樑的工作十分艱鉅，防洪措施，尤費周章。然而這座台灣第一大橋，畢竟還是完成了，以其「風雨不動安如山」的氣勢，橫跨於寬廣的濁水溪上。