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  • 首都圏外郭放水路

    Overview of Facilities

    Draining pump station

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    "Drain pump", "Operation Room" and "Drainage sluiceway" for draining flooding from underground areas.

    Showa Drainage Pump Station

    Showa Drainage Pump Station

    The Showa Drainage Pump Station has two roles. One is to drain the water that has passed through the underground tunnel into the Edogawa River from the pressure adjusting water tank through a massive pump or drainage pipe. The other is to centrally operate and manage every inflow facility from the operation room and ensure that water flows through safely. To use the human body as an example, the pump is the heart that sends blood through the body, while the operating room plays the role of the brain. The Draining Pump Station is arguably the facility that holds the functions of the Metropolitan Outer Area Underground Discharge Channel together.

    Pump Facility

    Pump Facility

    In the lower level of the Showa Drainage Pump Station, there are four large pumps, each with a drainage capacity of fifty cubic meters of water per second.
    When all four pumps are in full operation, their drainage capacity is 200 cubic meters of water per second. That's enough water to fill a 25-meter elementary school pool.
    Their drainage heights up to 14 meters, are the greatest in the country.

    Motor

    Motor

    Their power source is a remodeled gas turbine, originally developed for an aircraft It has an output of 1,400 horsepower. It is the largest generator being used to drive pumps in Japan. The gas turbine burns fuel and produces strong wind. The energy of this wind power is transferred to the water by rotating a hard, stainless steel impeller at a high speed, making drainage possible.

    Operation Room

    Operation Room

    The operation room can be thought of as the “brain” of the Metropolitan Outer Area Underground Discharge Channel. All data, from the weather to the state of each river, is gathered, monitored and controlled here.
    The surveillance control panel is the main computer of the Metropolitan Outer Area Underground Discharge Channel. The computer is used to control operations such as the opening and closing of the influx facility gates, as well as the starting and stopping of the pump facilities. In addition, about thirty surveillance monitors are controlled remotely to check if there are any people in the facility other than the operators or if there are any potentially dangerous items nearby during the opening and closing of the influx gates and the starting and stopping of the pump facilities. We also use CCTV cameras to monitor for any potential danger to people in the vicinity when water from the pressure adjusting tank is being drained into the Edogawa River.

    Drainage Sluiceway

    Drainage Sluiceway

    The Drainage Sluiceway is the facility that drains flood waters from the Metropolitan Outer Area Underground Discharge Channel. Flood water drawn up through the pump is passed through six water pipes and de posited into the Edogawa River. You might call it the “exit”of the Metropolitan Outer Area Underground Discharge Channel. By the way, each Sluiceway is 5.4 meters wide and 4.2 meters long. That’s big enough to easily fit one train car from the JR Yamanote line! In addition to serving as a mechanism to drain water into the Edogawa River, the drainage Sluiceway also prevents reverse water flow from the Edogawa River.

国土交通省 関東地方整備局 江戸川河川事務所
〒278-0005 千葉県野田市宮崎134 電話:04(7125)7311