In Osaka, crisscrossing rivers in the city were important as the means of transportation and other uses; accordingly, dredging, which was a way of controlling and maintaining rivers, was also important.
大坂ではその市内を縦横に走る川が交通手段その他の点で重要であったから、その維持管理である川浚え（浚渫）もまた重要であった。