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To prevent water accidents in rivers

Last updated July 11, 2024

Yokohama City is surrounded by 8 water systems and 56 rivers, most of which are small and medium rivers with small river widths and flow through urban areas. For this reason, the river in Yokohama has one aspect of the familiar natural environment left in the city, but also has the characteristic that the amount of water increases rapidly during heavy rains. Summer is a season when there are many water accidents in rivers. To prevent water accidents in rivers, keep the following promises when playing the river.

Promises that you want to keep in mind when you play the river

Check the weather and water level before you enter the river.

Water levels may rise suddenly. Check the weather and water level in advance. The water level of the river can be checked in the Yokohama City Water Disaster Prevention Information.

Be sure to go with an adult.

It is dangerous to play with children alone. Be sure to go with an adult.

Natural rivers have deep riverbeds and slippery places.

There are places where the river looks shallow but suddenly becomes deep, and there are places where it is slippery due to moss.

Wear a life jacket to make it safer.

If you wear a life jacket, it is safer.

Image of an enlightenment sign with four promises written

A signboard with these four promises is also posted along rivers in the city.


Signboard image (four promises to be careful when entering the river)

The river may change suddenly depending on the weather.

Even in rivers that can be enjoyed when it is sunny, the state can change completely. Not only when it starts to rain where you are now, but also when it rains upstream of the river, it may increase.
The photo shows a comparison of rivers in the city during normal times and the water level.

Let's check the water level of the river in the city with a smartphone or tablet terminal.

When you come to the river, check the water level of the river frequently. In Yokohama-shi, we release water level information of river flowing through the city on page of "Yokohama-shi water disaster information" page.

For inquiries to this page

Sewerage River Bureau River Department Planning Division

Phone: 045-671-4215

Phone: 045-671-4215

Fax: 045-651-0715

Email address: gk-kasenkikaku@city.yokohama.lg.jp

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Page ID: 268-145-889

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