Heisei Ozeki Dam: A Vital Mobile Barrage in Japan
The Heisei Ozeki Dam, also known as the Heisei Great Weir, serves as a critical piece of water management infrastructure located in Japan. Functioning as a mobile barrage—a type of dam structure that can be adjusted to manage water levels—this facility plays a dual role in protecting local communities and ensuring a steady water supply.
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Overview and Purpose
Situated on the Yamakuni River, the Heisei Ozeki Dam spans the border between Kōge in Fukuoka Prefecture and Nakatsu in Ōita Prefecture. The project was developed in multiple phases to address two primary environmental needs: flood control to prevent river overflow during heavy rains and water supply to support the surrounding regions.
Construction on this significant engineering project began in 1983. Following several stages of development, the dam was opened in 1990 and reached full completion in 1991.
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Key Facts
- Location: Spans Kōge, Fukuoka and Nakatsu, Ōita, Japan.
- River: Impounds the Yamakuni River.
- Type: Mobile barrage dam.
- Primary Functions: Flood control and water supply.
- Completion: Fully completed in 1991.
Technical Specifications
The Heisei Ozeki Dam is characterized by its unique mobile barrage design. While the total length of the structure is 218 meters, the mobile component itself measures 166 meters. This design allows for precise management of the reservoir's capacity and the river's flow.
| Feature | Measurement |
|---|---|
| Height | 3.15 m (10.3 ft) |
| Total Length | 218 m (715 ft) |
| Mobile Barrage Length | 166 m (545 ft) |
| Total Reservoir Capacity | 52,000 m³ (1,800,000 cu ft) |
| Catchment Area | 521 km² (125 cu mi) |
| Surface Area | 15 ha (37 acres) |
Frequently Asked Questions
What is a mobile barrage?
A mobile barrage is a type of dam structure designed with movable components. This allows engineers to adjust the height of the barrier to control water levels, manage flow, and mitigate flooding.
Where exactly is the Heisei Ozeki Dam located?
The dam is located on the Yamakuni River, positioned between Kōge in Fukuoka Prefecture and Nakatsu in Ōita Prefecture, Japan.
What are the main functions of this dam?
The Heisei Ozeki Dam was constructed primarily for flood control and to provide a reliable water supply for the local area.
When was the dam completed?
Construction began in 1983 and the dam opened in 1990, with the entire project reaching full completion in 1991.
How large is the reservoir?
The reservoir has a total capacity of 52,000 cubic meters and covers a surface area of 15 hectares.