Koai Tamei, Water reservoir and detention basin in Katsushika-ku and Misato, Japan.
The Koai Tamei facility consists of interconnected water channels and containment structures that regulate water flow across eastern Saitama Prefecture and neighboring regions.
Izawa Yasobee initiated the construction of Koai Tamei in 1729 to address water management needs in the Nakagawa Basin, a region affected by frequent flooding.
The reservoir exemplifies Japanese engineering methods from the Edo period, demonstrating early solutions for water resource management in densely populated areas.
Visitors can reach the reservoir using local transportation from Tokyo, with several observation points providing views of the water management infrastructure.
The dual-function facility maintains water levels during dry periods while simultaneously serving as a protective basin during heavy rainfall events.
Location: Katsushika-ku
Location: Misato
Inception: 1729
Founders: Izawa Yasobee
GPS coordinates: 35.78806,139.87107
Latest update: March 5, 2025 14:38
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