Witnessing the world's largest underground sewer, which can withstand a 3-day super storm

Witness the world's largest underground sewer, a super storm that can't flood for 3 days

Friday, March 29, 2024 2:36 PM (GMT+7)

Deep beneath the city of Saitama, on the outskirts of Tokyo, lies a giant sewer system. The structure was built to protect the city's 13 million residents from the heavy rains and increasingly severe tropical storms that regularly hit Japan.

The flood drainage system under Tokyo, Japan, was once recognized by the Guinness Book of Records as the world's largest underground sewer with giant vertical wells and more than 70 high-capacity pumps.

It is known that it took Japan 13 years and a cost of more than 2 billion USD to put this underground sewer project into use, and if including the completion time, it took up to 17 years.

Accordingly, this system began construction in 1992, designed to include 5 large concrete wells, connected by a 6.4 km long tunnel system.

The highlight of the project is the pressure tower, which is known as the "underground palace" with a length of 177 m, a width of 78 m, and a height of 25.4 m. To support the pressure tower, 59 solid reinforced concrete columns are used, each of which can withstand 500 tons of weight.

The structure itself is a feat of modern engineering. The idea behind the project is actually quite simple: to divert all the stormwater from storms, typhoons, and floods from the surrounding cities and towns, especially Tokyo, into the Edogawa River.

A 6.4 km long tunnel connects the reservoirs.

Pump room.

Floodwater from the city’s water pipes would flow through the tunnel and into the cistern. When the cistern was full, the water would travel through long tunnels to eventually flow into this massive “underground temple.”One of the giant wells.

Diagram of underground sewer system operation. Water from the ground flows down the vertical well, through the sewers, and then is pumped out.

The structure is used approximately seven times a year, but when it is inactive it is open to the public. Tourists can also visit this giant underground building.

In terms of grandeur and grandeur, the drainage system built under Tokyo may be one of the few modern structures that can reach such stature.

PV (According to ANTĐ)

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Source: https://danviet.vn/muc-so-thi-cong-ngam-lon-nhat-the-gioi-sieu-bao-3-ngay-cung-khong-the-ngap-20240329135719968.htm