The Metropolitan Area Outer Underground Discharge Channel is the largest underground water facility in the world.Built to protect residents from constant flooding.
source/image: Great Big Story
the system drains rainwater to a massive tunnel underground that then redirects the flow to a nearby river that can handle the influx of water. Thanks to the ingenuity of the drainage system, Japan’s residents are kept high and dry.
The discharge channel is a mechanism to drain water from flooded residential areas into five gigantic vertical shafts built below ground and then discharge it into rivers through an underground tunnel connecting the shafts.
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The cylindrical shafts are about 70 meters tall. The large shafts measure about 30 meters in diameter, spacious enough to park a space shuttle.
