Welcome to the Underworld

• Welcome to the underworld

Welcome to the Underworld

Seventy-five percent of Japan is covered by mountains, plains surrounded by mountains and are actually in the valley, as well as pierced by many rivers flowing to the ocean. In heavy rain from frequent typhoons, water flows in the plains, going there, the river quickly overflowed and overflow their banks, causing flooding of terrain.

Especially this famous area between the river beds Edogawa and Arakawa, located just off of Tokyo. Vysokourbanizirovany this area has repeatedly been subjected to flooding honest, until it was decided to end this once and for all.

Welcome to the Underworld

All probably seen the street "livnovku" - rain water drains into the lattice along the streets and through the pipes is carried into the nearest river. In the Japanese case, it was necessary to construct about the same, but not on the scale of the street and the city. Construction of the system began in 1993, and the main works are completed in 2008. As of 2008 the project had invested more than $ 2 billion, but the construction and expansion of the system continues to this day. At concreting it took more than 180 million tons of concrete.

The operating principle of the following - the water from overflowing rivers drain into the special underground tanks, connected by tunnels. Tanks are like communicating vessels - the overflow of water flows into a large underground room where the pump rises to the top, resulting in the large river Edogawa, which direction lies outside the flood zone. Since the amount of water is very large, and the system was built rather big.

The general scheme of flood control system

Welcome to the Underworld

Base - five underground vertical "cup", up to 72 meters in depth and a diameter of up to 32 meters in that at special channels and drain water falls from the rivers. At the bottom of the "cups" were dug water-binding tunnels with a diameter of 10, 6 meters - much larger than the diameter of underground tunnels. The total length of tunnels is greater than 6300 meters. For penetrations used rotary shield - that's its layout.

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A rotor shield is set as memorial.

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Tubes

Welcome to the Underworld

After the last "cup" is an underground reservoir - columned hall length of 177 meters and a height of 25, referred to as "The church" (The Temple).

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A view of one of the "cup"

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on the surface of the Ladder

Welcome to the Underworld

four hydraulic pump driven by gas turbines located at the end of the hall. The total capacity of the pumps 10.3 million watts capacity of 200 cubic meters of water per second. Close-Olympic swimming pool, such a system will dry in less than a minute.

The photograph by a model of turbine and gearbox - the right figures of people for scale.

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Overall operating system layout (scale tunnels connecting the left side greatly underestimated). If you press the button in the layout of the water begins to flow, fill the "glasses", then pumped

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The machine room is larger

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And so the building looks from the outside - visible drives water valves.

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Main room control the entire system.

Welcome to the Underworld

From Tokyo pice MOE, if the total amount of precipitation fell on Tokyo will be 550 mm in three days, Arakawa river in China area out of the coasts, flooding is not less than 97 metro stations. Tokyo can not afford it, and the system of G-Cans on forces to cope with the influx of water.

Welcome to the Underworld

There are theories that the system G-Cans also initially has a much wider application and can be used not only as a collector but as a reservoir for water desalination, a huge bomb shelter, and refuge in case of eruption of Fuji volcano.

Welcome to the Underworld

, and provides guided tours in the G-Cans (Syutoken Gaykaku Hosuyro) to at least partially cover the costs for the construction, management turned the object into a tourist attraction. In this free tour.

Welcome to the Underworld

While on the tour, not all and not always allowed to visit G-Cans. Firstly, even though the weather is good and the feeling of inactivity, the object does not cease to work for a minute.

Welcome to the Underworld

Tour G-Cans can be canceled at any time and require emergency evacuation.

Because of this, all tour participants require knowledge of the Japanese language or be accompanied by an interpreter, on the necessity of the case.

Welcome to the Underworld

Also, the number of tour participants is also limited for security reasons. From visitors required to be in good physical condition, comply with the restrictions in the wardrobe (clothes), as would have to go up and down stairs.

Welcome to the Underworld

Due to the futuristic environment object is often used for the filming of movies and television programs. In particular, there was filmed a promotional video for Land Rover vehicle and the actions of one of the levels of Mirror's Edge PC game are inside the G-Cans.

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