After that he also carried out the work to level the Uemachi Plateau and construct a channel in order to make Yamato-gawa River flow directly into the Osaka Bay, but his attempt failed (it is said that Kawazoko-ike Pond situated in the premise of Chausuyama Tumulus (Osaka), in Tennoji Ward, Osaka City is a remain of this failed project and there is a bridge called 'Wake-bashi Bridge.')
その後、に上町台地を開削して大和川を直接大阪湾に注ぐ工事を行ったが失敗している（大阪市天王寺区の茶臼山古墳(大阪市)にある河底池はその名残りとされ、「和気橋」という名称の橋がある）。