Japan, known for its mountainous terrain and abundant rivers, has built an extensive network of dams that play a crucial role in the country’s hydroelectric power generation, water supply, irrigation, and flood control. With a focus on renewable energy and effective water management, Japan’s dams are vital to the country’s infrastructure. In this article, we will examine the top 10 largest dams in Japan, providing insights into their power output, location, river, and capacity.
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1. Kurobe Dam
- Location: Toyama Prefecture
- River: Kurobe River
- Power Output: 335 megawatts (MW)
- Capacity: 199 million cubic meters
Kurobe Dam, Japan’s tallest dam, stands at 186 meters and is located on the Kurobe River. With a power output of 335 MW, it is a key source of hydroelectric power for Japan. The dam also provides water for irrigation and flood control, with its reservoir forming a stunning lake that has become a popular tourist destination.
2. Okuyoshino Pumped Storage Power Station
- Location: Nara Prefecture
- River: Yoshino River
- Power Output: 1,206 megawatts (MW)
- Capacity: 7.5 million cubic meters
Okuyoshino Dam is part of the Okuyoshino Pumped Storage Power Station, which is one of Japan’s largest hydroelectric power plants. It generates 1,206 MW of power and helps balance the energy grid by storing energy during low demand periods. The station’s reservoir is used for power generation as well as water supply and flood management.
3. Tokuyama Dam
- Location: Gifu Prefecture
- River: Ibi River
- Power Output: 153 megawatts (MW)
- Capacity: 660 million cubic meters
Tokuyama Dam is one of the largest dams in Japan by capacity, capable of holding 660 million cubic meters of water. It generates 153 MW of hydroelectric power and is essential for water management, flood control, and irrigation in the region. Its large reservoir is a critical water source for the surrounding communities.
4. Imaichi Dam
- Location: Tochigi Prefecture
- River: Togawa River
- Power Output: 1,050 megawatts (MW)
- Capacity: 14 million cubic meters
Imaichi Dam is part of a pumped storage system that powers the Tokyo metropolitan area. With a power output of 1,050 MW, the dam is an integral part of Japan’s renewable energy infrastructure. Its reservoir also provides water for irrigation and plays a role in regulating the Togawa River’s flow.
5. Nagawado Dam
- Location: Nagano Prefecture
- River: Azusa River
- Power Output: 300 megawatts (MW)
- Capacity: 123 million cubic meters
Nagawado Dam, located on the Azusa River, generates 300 MW of electricity and supports irrigation in the Nagano Prefecture. The dam’s reservoir is used to manage water flow and supply water for agriculture, while also serving as a scenic spot for recreational activities like fishing and boating.
6. Futase Dam
- Location: Saitama Prefecture
- River: Arakawa River
- Power Output: 60 megawatts (MW)
- Capacity: 43 million cubic meters
Futase Dam, located on the Arakawa River, generates 60 MW of hydroelectric power and helps manage flood risks in the region. The dam is also used for water supply and irrigation, providing essential resources to nearby agricultural areas. Its reservoir supports tourism and recreation.
7. Miharu Dam
- Location: Fukushima Prefecture
- River: Ōtakine River
- Power Output: 60 megawatts (MW)
- Capacity: 67 million cubic meters
Miharu Dam, located on the Ōtakine River, generates 60 MW of electricity and is a vital part of the region’s water management system. The dam’s reservoir provides water for irrigation, flood control, and domestic use. It also contributes to the protection of agricultural lands during heavy rainfall.
8. Matsukawa Dam
- Location: Iwate Prefecture
- River: Matsukawa River
- Power Output: 46 megawatts (MW)
- Capacity: 28 million cubic meters
Matsukawa Dam, located on the Matsukawa River, generates 46 MW of power and plays an important role in water supply and flood control in Iwate Prefecture. The dam supports local agriculture by providing water for irrigation, while its reservoir is also used for recreational purposes such as boating and fishing.
9. Setoishi Dam
- Location: Kumamoto Prefecture
- River: Kawabe River
- Power Output: 40 megawatts (MW)
- Capacity: 50 million cubic meters
Setoishi Dam, located on the Kawabe River, generates 40 MW of hydroelectric power and helps with flood control and water management in the region. The dam is crucial for supplying water to the local communities and agricultural areas, making it a vital piece of infrastructure for Kumamoto Prefecture.
10. Hōheikyō Dam
- Location: Hokkaido
- River: Toyohira River
- Power Output: 60 megawatts (MW)
- Capacity: 21 million cubic meters
Hōheikyō Dam is located on the Toyohira River in Hokkaido and generates 60 MW of electricity. The dam’s reservoir provides water for irrigation and flood control, while also serving as a popular tourist destination due to its scenic surroundings. Hōheikyō Dam is critical for managing water resources in the region.
Conclusion
Japan’s largest dams play an essential role in powering the country, managing water resources, and controlling floods. From the towering Kurobe Dam to the highly productive Okuyoshino and Tokuyama dams, these structures are vital to Japan’s renewable energy sector and water management systems. As Japan continues to emphasize renewable energy and environmental sustainability, these dams will remain central to the country’s energy and water strategies.
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