Underneath Tokyo sits the largest man-made reservoir system in the world.
During dry periods, the surge tank is actually used as a tourist attraction. Visitors can tour the site for about 3000 Japanese Yen, or roughly 30 USD. While any jet-hopping civil engineer might be bursting to take a trip and see this underground marvel, it should be noted that the tours are only conducted in Japanese.
Initially, the infrastructure was sparse enough that the floods weren't considered to be a major issue. However, from the 1960s through the 1980s, much of the region's farmland had been replaced with housing and industrial facilities, significantly decreasing the opportunity for rainfall and snowmelt to seep underground. When the suburbs of Tokyo were initially being developed, the sprawl occurred so fast that little thought was given to flood control.
This massive system works through a system of switches that engineers can control during high rain or flooding events. Due to the series of tunnels that run throughout the city, connected to the underground reservoir, engineers canThe end goal of the system isn't just to hold water though. In flooding events that have a rapid onset, the first task of mitigating the flooding risk is handling the surge.
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