In 1612, Doton, believing it necessary to excavate a river in order to develop Jonan obtained permission from the Toyotomi family and began excavating a canal (later known as Dotonbori) in the central area of Jonan at his own expense.
1612年、城南の開発には河川の堀鑿が必要と考えた道頓は豊臣家の許可を受け、私財を投じて城南地域中心部の水路（後の道頓堀）の堀鑿に着手した。