Along the State Road 16 at Kasukabe City in Saitama Prefecture, about 50 meters underground, there’s a drainage system built by Japan’s advanced civil and construction engineering technology. River floods of surrounding areas meets here together, after adjustment then discharges into the Edo-gawa, which is a Japan’s large river, finally goes into Tokyo Bay, a total length of 6.3 km. Japanese built this drainage system from 1992 to 2006, after the completion, the use of it has played a critical role during the flood season.
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