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Cavernous Surge Tank Protects Tokyo From Floods
Friday, November 2, 2012 21:03
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A massive underground surge tank protects Tokyo from the yearly onslaughts of typhoons and storms, many similar in force to Hurricane Sandy. Full Story: In the low-lying suburbs of Tokyo, an underground pump station protects the capital from flooding. Japan's land ministry says it is the world's current largest solution to flooding. Here is a pump station for the Tokyo Metropolitan Floodway, the end point of a 3.7 mile (6 kilometer) long network of tunnels, capable of channeling away storm waters at the rate of 5 Olympic-size swimming pools every minute. The aim is to prevent scenes like those in New York this week, when Hurricane Sandy caused widespread flooding across parts of the city. A study of several towns in Tokyo's low-lying northern suburbs before and after the water system was completed in 2006, shows positive results. [Takashi Komiyama, Pump Station Chief]: “The floodway is directly protecting people from floods, the results are there. The damage is down by about two-thirds, in terms of both the number of homes that get flooded and the areas that are impacted.” The jewel of the system is a cavernous surge tank measuring 580 feet (177 meters) long, 256 feet (78 meters) wide and 59 feet (18 meters) high. As smaller rivers rise during typhoons, the water is diverted into the tank through 3.9 miles (6.3 kilometres) of tunnels at a maximum rate of 260 cubic yards (200 cubic meters) every second. From there, the water is slowly pumped into the Edo River, a waterway …
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2012-11-02 19:43:44
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