During the Azuchi–Momoyama period (1568 to 1600), the "Taiko Sewerage" was built around Osaka Castle, and it still exists and functions today.
Pada zaman Azuchi-Momoyama (1568 to 1600), sistem limbah "Selokan Taiko" dibangun di sekeliling Istana Osaka, dan masih berfungsi hingga sekarang.