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 ...

Known formally as the Metropolitan Area Outer Underground Discharge Channel, the facility was built to protect the capital and surrounding communities from the destructive floods that increasingly ...