During the Azuchi-Momoyama period a facility called Taiko Gesui (or called Sewari Gesui, sewari sewer, stone built sewer ditches) was built near Osaka castle by Hideyoshi TOYOTOMI and is used even now.
安土桃山時代には豊臣秀吉によって太閤下水と呼ばれる設備が大阪城付近に造られ、現在でも使用されている。