Tokyo's flood control system has four jet-powered turbines which can drain floodwaters at an impressive rate of a 25-meter swimming pool per second.

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The Metropolitan Area Outer Underground Discharge Channel (also known as the G-Cans Project) is an underground water infrastructure project in the outskirts of Tokyo, Japan. It is the world's largest underground flood water diversion facility, built for preventing overflow of the city's major waterways and rivers during rain and typhoon seasons. Built between 1992 and 2009, it consists of five 65 m high and 32 m wide silos, connected by 6.4 km of tunnels 50 m beneath the surface. Several 10 Megawatt pumps can pump up to 200 tons of water per second into the Edogawa River. Map

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