Although, in 1958, they began the study of the implementation of the plan to roughly design specific types of dams and their capacities of water, they had to review the original flood control plan because the Ise Bay Typhoon in the following year (1959) brought about considerable flooding, surpassing that of Typhoon 13, and furthermore, water demand grew tremendously due to the rapid growth of the population in the Kansai area and the expanding Hanshin Industrial Zone.
1958年（昭和33年）よりダムの具体的な型式や貯水容量等を検討する実施計画調査に入ったが、翌1959年（昭和34年）に伊勢湾台風が台風13号の洪水流量を超える水害を惹き起こした為洪水調節計画を再検討、更に関西圏の急激な人口増加と阪神工業地帯の拡充により水需要が逼迫。