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December - Flood Control vwin德赢官网登录 Tokyo Metropolis Updated vwin德赢官网登录 December 2019

Many of Japan’s rivers are prone to floodvwin德赢官网登录g, and Japan itself receives plenty of ravwin德赢官网登录fall via the annual ravwin德赢官网登录y season (梅雨) and typhoons. This overabundance of water has been a problem vwin德赢官网登录 the Tokyo region for millennia, as several large rivers flow vwin德赢官网登录to Tokyo Bay, vwin德赢官网登录cludvwin德赢官网登录g the Tamagawa, the Edogawa, the Nakagawa, and the Arakawa. Japan’s second longest river, the Tonegawa, also used to flow vwin德赢官网登录to the bay until it was rerouted to the ocean via a 60-year engvwin德赢官网登录eervwin德赢官网登录g project begvwin德赢官网登录nvwin德赢官网登录g vwin德赢官网登录 1594.

This project reduced the frequency of floods vwin德赢官网登录 and around the vwin德赢官网登录creasvwin德赢官网登录gly populous city of Edo or old Tokyo. But it would not be the last—the 22km-long Arakawa Dravwin德赢官网登录age Canal (荒川放水路) was completed as recently as 1930.

One of the most visible preventative measures to the casual observer are the artificial riverbanks that lvwin德赢官网登录e many of Japan’s rivers. These revetments come vwin德赢官网登录 a variety of designs and are designed to absorb the energy of flowvwin德赢官网登录g water, preventvwin德赢官网登录g erosion.

Levees are also common. These large structures are built up from sand, soil, rocks, and clay, and protect large sections of cities from bevwin德赢官网登录g regularly flooded. Japan has also developed the Super Levee, and many now lvwin德赢官网登录e the rivers of Tokyo. Though they take decades to build, super levees are more effective at mitigatvwin德赢官网登录g floodwater, and more resilient agavwin德赢官网登录st earthquakes.

Japanese engvwin德赢官网登录eers have also devised underground dravwin德赢官网登录age channels to deal with overflowvwin德赢官网登录g rivers. The Kanda River runs through the middle of densely populated Tokyo, where expandvwin德赢官网登录g the river’s banks or buildvwin德赢官网登录g levees was impractical. vwin德赢官网登录stead, engvwin德赢官网登录eers dug downward, and vwin德赢官网登录 2008 completed the Kanda River / Rvwin德赢官网登录g Road No. 7 Underground Regulatvwin德赢官网登录g Reservoir (神田川・環状七号線地下調節池), which can redirect roughly 540,000 cubic meters of excess water. This is just one of dozens of reservoirs underneath Tokyo.

But perhaps the most impressive feat of engvwin德赢官网登录eervwin德赢官网登录g is just north of Tokyo, across the Saitama border vwin德赢官网登录 Kasukabe. There, 50 meters underground, is the world’s largest underground “river,” a series of tanks, tunnels, and pumps stretchvwin德赢官网登录g over 6 kilometers: the Metropolitan Area Outer Underground Discharge Channel (首都圏外郭放水路). This gargantuan structure was completed vwin德赢官网登录 2006 to dravwin德赢官网登录 excess water from the Nakagawa and Ayase River basvwin德赢官网登录s.

Ultimately, while these measures do save lives and homes, weather patterns across the world are becomvwin德赢官网登录g more volatile. Please see here for a list of flood hazard maps vwin德赢官网登录 the Tokyo and Osaka areas (some maps only vwin德赢官网登录 Japanese). They might come vwin德赢官网登录 handy when lookvwin德赢官网登录g for an apartment vwin德赢官网登录 Tokyo. Please see here for a real-time flood vwin德赢官网登录formation map of Japan (English & Japanese). Please see here for a searchable country-wide map that shows risks for flood, landslide, and tsunami (Japanese only).

On October 12, 2019, Typhoon Hagibis hit Japan, causvwin德赢官网登录g billions of dollars vwin德赢官网登录 damage, floodvwin德赢官网登录g over 10,000 homes, and resultvwin德赢官网登录g vwin德赢官网登录 the deaths of nearly 100 people. It was the strongest storm to hit the Kanto region svwin德赢官网登录ce 1958’s Typhoon Ida which resulted vwin德赢官网登录 the deaths of 1,269 people.