The Hata clan are thought to have helped construct the Manda Levee as flood prevention works for the present-day Yodo-gawa River, and it has also been shown that the present-day Atsuta-jinja Shrine was built on the site of Kawachi Hata-dera Temple (now ruined) whose written records are preserved in Koryu-ji Temple.
秦氏が現在の淀川の治水工事として茨田堤を築堤する際に協力したとされ、現在の熱田神社が広隆寺に記録が残る河内秦寺（廃寺）の跡だったとされる調査結果もある。