The world's largest underground sewer city cannot be flooded even after a 3-day super storm
Friday, February 29, 03 2024:14 PM (GMT+36)
Located deep under Saitama city, a suburb of Tokyo, is a giant sewer system. The structure was built to protect the city's 13 million residents from heavy rains and the increasingly severe tropical storms that often strike Japan.
The flood drainage system under the capital Tokyo, Japan was once recognized by the Guinness Book of Records as the largest underground sewer in the world 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. If including the completion time, it would take 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 pressurization tower, which is known as the "underground palace" 177 m long, 78 m wide, 25,4 m high. To support the pressurization tower, 59 reinforced concrete columns are used, each of which can withstand 500 tons of weight.
The structure itself is a marvel of modern engineering. The idea behind this project is actually quite simple, it is to redirect all the rainwater from storms, tropical storms and floods from surrounding cities and towns, especially Tokyo, to the Edogawa River.
The 6,4 km long tunnel connects the tanks.
Water pump room.
Flood water from the city's water pipes will flow through the tunnel and into the water tank. When the vault is full, water will move through long tunnels to eventually flow into this massive "underground temple". One of several giant wells.
Diagram of underground sewer operating system. Water from the ground flows down the vertical well, through the drains, then is pumped out.
Each year, the structure is used approximately seven times, but when it is inactive it is open to the public. Tourists can also visit this huge underground building.
In terms of grandeur and grandeur, the drainage system built under the city of Tokyo may be one of the few modern projects that can reach such stature.
PV (According to ANTĐ)
