Researcher discovers 6th century Japanese irrigation system

A retired civil engineer has written a report on a 6th and 7th century irrigation system in the in Osaka Prefecture. Kazuo Takatsu spent 15 years on the report, which chronicles a system to collect rain water.

Furuichi Omizo is a 10.5 kilometer system that was designed to carry water to neighboring farms and was commissioned by Empress Suiko.