To make sure Tokyo is a safe and secure place, the city government did some smart things. They built a big pond underground and made the rivers wider to stop water disasters. In the 1980s, cities started using a lot of concrete, which caused floods. Because of bad experiences, the city decided to fix this problem.
During summer, typhoons hit Japan, causing rivers to flood and homes to get filled with water. But after building the big underground pond, the damage from floods went down a lot. There are 28 of these ponds, and more than 20 of them help soak up floodwater to keep everyone safe.
People also do their part to keep the city safe and green. In one district, they have 758 tanks that collect rainwater to stop floods. They call it a “Miniature Dam,” and it can hold a lot of water—26,000 tonnes! Residents in Sumida District use rainwater for everyday things. They have tanks in their homes, and some even have special tanks underground to share water with neighbors.
The Sumida District office guy, Wataru Nahara, thinks using rainwater is a team effort. Many residents have their own rainwater tanks, and they use the water every day. There are even 20 places called “Rojison” where rainwater from houses is stored in tanks underground. Neighbors can pump the water and use it for farming. This way, they use rainwater to keep things green and for daily life.
Using rainwater helps not just with the environment but also with staying clean. The Tokyo Metropolitan government and the people work together to make sure the city is safe and nice for everyone. Lots of people visit Tokyo, so the police always think about how to keep everyone safe and happy.
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