The cleanliness of floodwater in U.S. and Japanese subway systems reflects deeper differences in infrastructure and urban ...

Known as the Metropolitan Area Outer Underground Discharge Channel, the facility stretches over 3.7 miles (six kilometers) beneath the city of Kasukabe, in the Saitama Prefecture, roughly 25 miles ...

A STAFF MEMBER of Metropolitan Outer Floodway Management Office demonstrates how to perform checkups inside a pressure-adjusting water tank, part of a complex of underground water discharge tunnels ...

The Metropolitan Area Outer Discharge Channel was designed to alleviate the rainfall that has caused six major floods to occur in the region since 1979, two from typhoons, providing an underground ...