The gravel from Tachia River is completely monopolized by the Taichung Harbor project, being used for its breakwaters and other civil engineering works; rights to the Chuoshui River, which carries the largest volume of silt of all, are given up to the various projects in the Six-Year National Development Plan and to the land reclamation project for the 6th Naphtha Cracker in Yunlin County.
許多大河川更名花有主，大甲溪的沙被台中港一手包辦，做為堤防等各種工程使用；輸沙量最大的濁水溪，支配權則屬「六年國建」的各項建設與雲林六輕填海計畫。