Published On: Fri, Oct 6th, 2017

Tokyo Is Preparing for Floods ‘Beyond Anything We’ve Seen’

Still, the Kasukabe operation remains a critical part of Tokyo’s defenses, say officials at Japan’s Land Ministry, which runs the site. Five vertical, underground cisterns, almost 250 feet deep, take in storm water from four rivers north of Tokyo.

A series of tunnels connect the cisterns to a vast tank, larger than a soccer field, with ceilings held up by 60-foot pillars that give the space a temple-like feel. From that tank, industrial pumps discharge the floodwater at a controlled pace into the Edo river, a larger river system that flushes the water into Tokyo Bay.

Between floods, site managers run tours of the facility, inviting members of the public to walk on the floor of the vast tank and to peer into the murky cisterns.

“This is another important role,” said Mr. Abe’s deputy, Yasuyuki Osa, after a recent tour, “to get people to think about the danger of floods, and how we can adapt.”

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