Ryu Q Kan or Metropolitan Area Outer Underground Discharge Channel, officially called G-Cans, was built 50 meters underground at Kasukabe, Saitama Prefecture. To build a giant tunnel into a large drainage channel that invested $ 3 billion in US dollars. And from 1992 to 2006 to prevent floods from the past. There are many deaths and houses damaged more than ten thousand. Ryuquang drainage has a tunnel section of 6.3 km high, 65 m wide and 32 m high to deliver water to a 177-meter-long water tank and 78 m high and 18 m high. Up to 59 to Edogawa River 200 tons per second ever. #MyCountry2 #GuideBook #japanportrait