行徳可動堰, Water control weir in Ichikawa, Japan.
Gyotoku Movable Weir controls water flow where the Edo River meets the Edogawa Floodway in Ichikawa. The structure uses cylindrical gates that can be raised with cable mechanisms to manage water movement and block saltwater intrusion.
It was built between 1950 and 1957 following severe floods in the 1930s that showed the need for better water control. The project was part of a larger effort to improve flood management along the Edo River system.
The weir plays a key role in water management for millions of people in the greater Tokyo region. It helps keep fresh water available for homes and businesses while preventing saltwater from entering the river system.
The weir is visible from the outside and visitors can observe the large gates and the river facility area. It is best to visit during normal water conditions when the site is safe to explore and the mechanism is easier to understand.
The facility uses a rare rolling gate system with cylindrical doors that move like rolling mechanisms. This special design allows the gates to open and close very quickly during emergency flood situations.
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