Underpass drainage channel full#
In other words, a 25-meter swimming pool full of water is drained in a second. Pumps capable of draining a 25-meter swimming pool full of water in a secondįlood water stored in the channel can be discharged into rivers at a maximum rate of 200 cubic meters per second. An inside look at the tank structure conjures up the image of a “temple” below ground. The ceiling of the water tank is supported by 59 pillars which are 18 meters tall and weigh 500 tons each. Measuring 177 meters long and 78 meters wide, and lying about 22 meters below ground, the water tank is larger than a soccer pitch. The tank is designed to perform multiple functions, including abating the force of running water and adjusting water pressure that could change sharply if a water pump breaks down. The tunnel stretches for 6.3 km, including a sharp curved line with a minimum radius of 250 meters.īefore being discharged into rivers, the drained water is stored in a huge pressure-controlled tank. The connecting tunnel 50 meters below ground measures about 10 meters in diameter. The large shafts measure about 30 meters in diameter, spacious enough to park a space shuttle. The cylindrical shafts are about 70 meters tall. 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. The Metropolitan Area Outer Underground Discharge Channel, an underground discharge channel constructed in Saitama Prefecture adjacent to Tokyo, represents technological innovations accumulated over many centuries. So, Japan's effort to develop flood-control technology dates back to the ancient past.
Steep rivers flowing into the ocean easily overflow when heavy rain falls. Japan is a long ribbon of islands stretching north to south, divided by a spine of steep mountains occupying 75% of the land.
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