How Japan Keeps Millions of Residents Safe From Floods

The video discusses the world's largest underground water facility located near Tokyo. This facility, known as the metropolitan area Outer Underground Discharge channel, is a massive tunnel system built to prevent flooding in the region. It features a network of vertical shafts that store floodwaters and redirect them to a river capable of handling the excess water. This system protects over 9 million residents from flooding.

Where is the largest underground water facility located?

• New York

• Tokyo

• Paris

• London

How deep is the tunnel situated underground?

• 200 feet

• 250 feet

• 160 feet

• 100 feet

What is the primary function of the large vertical shafts inside the tunnel?

• To support the structure

• To provide ventilation

• To generate electricity

• To store floodwaters

Why were the giant tunnels constructed in this area of Japan?

• To enhance tourism

• To support agriculture

• To prevent frequent flooding

• To improve transportation

How does the facility help protect the residents?

• By providing clean water

• By reducing air pollution

• By diverting floodwaters to a river

• By offering shelter during storms