Exploring Yabakei Dam: A Multipurpose Landmark in Ōita Prefecture
Located in the scenic landscapes of Ōita Prefecture, Japan, the Yabakei Dam serves as a vital piece of infrastructure for the region. More than just a barrier for water, this massive concrete structure plays a crucial role in managing the Yamakuni River system, providing safety, resources, and recreation for local communities and surrounding cities.
Key Facts
- Location: Ōita Prefecture, Japan (Nakatsu City area).
- Dam Type: Gravity-type concrete dam.
- Height: 62.0 meters (203.4 feet).
- Total Capacity: 23,300,000 cubic metres.
- Primary Purpose: Multipurpose (flood control, water utilization, and hydroelectric power).
- Reservoir Name: Yabakeiko.
Technical Overview and Construction
The Yabakei Dam is a gravity-type concrete dam, a design where the dam's own weight is sufficient to resist the horizontal pressure of the water behind it. Managed by the Kyushu Regional Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism, it acts as the primary dam within the Yamakuni River system.
Construction on the dam began in 1970, and it was officially opened in 1984. Interestingly, during the initial survey stage, the project was tentatively named "Kakisaka Dam," derived from local place names. However, before construction commenced, the name was changed to Yabakei Dam to honor the famous Yabakei scenic area, which is a premier tourist destination in the region.
Water Management and Capacity
The dam utilizes the Yamautsuri River, a tributary of the Yamakuni River, to serve several critical functions. It works in conjunction with the Heisei Ozeki Barrage located downstream to support the water needs of Nakatsu City, Kitakyushu City in Fukuoka Prefecture, and the Kyogetsu area. The dam's capacity is strategically divided to handle various needs:
- Flood control: 11.2 million m³
- Water utilization: 9.8 million m³
- Unspecified irrigation water: 5.5 million m³
- Urban water and power generation: 4.3 million m³
| Feature | Details |
|---|---|
| Dam Type | Gravity-type concrete |
| Height | 62.0 m (203.4 ft) |
| Total Reservoir Capacity | 23,300,000 m³ |
| Construction Start | 1970 |
| Opening Date | 1984 |
| Coordinates | 33°26′49″N 131°07′27″E |
Yabakeiko: A Destination for Recreation
The reservoir created by the dam is known as Yabakeiko. While it shares its name with the famous Yabakei area, it is important to note that the lake itself is not designated as part of the Yaba-Hita Hidehikoyama National Monument. Nevertheless, it has become a beloved tourist spot in Nakatsu City due to its beautiful scenery and featuring fountains.
For water sports enthusiasts, Yabakeiko offers unique opportunities. In 1994, the Yamaki Aqua Park opened as Japan's first public water ski facility. Visitors can enjoy water skiing, wakeboarding, and banana boat rides. While the facility previously closed during the winter months, it has been operating year-round since 2006.
Frequently Asked Questions
What is the primary purpose of the Yabakei Dam?
The Yabakei Dam is a multipurpose dam designed for hydraulic control (flood prevention), water utilization, and the generation of hydroelectric power.
Can I visit Yabakei Dam for tourism?
Yes. The dam and its reservoir, Yabakeiko, are known for their beautiful scenery. The area also features the Yamaki Aqua Park, where you can participate in water sports like water skiing and wakeboarding.
Is the lake part of a National Monument?
No. Although the lake is named Yabakeiko after the scenic area, it is not designated as part of the Yaba-Hita Hidehikoyama National Monument.
Is the water ski facility open in the winter?
Yes. While the Yamaki Aqua Park used to close during the winter, it has been open for year-round use since 2006.
Which rivers are involved with this dam?
The dam is the main dam in the Yamakuni River system and utilizes the Yamautsuri River, which is a tributary of the Yamakuni River.