Yoichi HATTA, a civil engineer of the Sotoku-fu, spent ten years to complete the Ushantou dam, the largest in the south east Asia at that time, and started the construction of Chianan Canal in 1920, and, with the completion of the major part in 1934, it became a huge water supply facility to supply water to the Chianan Plain, which covered as much as 14% of the total farming area in Taiwan.
総督府技師の八田与一は10年の歳月を費やし、当時東南アジアで最大となる烏山頭ダムを完成させると、1920年には嘉南大圳建設に着工、1934年に主要部分が完成すると嘉南平原への水利実現に伴い、台湾耕地面積の14%にも及ぶ広大な装置を創出した。