| Tokuyama Dam | |
| Dam Crosses: | Ibi River |
| Location: | Ibigawa, Ibi District, Gifu Prefecture, Japan |
| Dam Type: | Embankment, rock-fill |
| Dam Length: | 427.1m (1,401.2feet) |
| Dam Height: | 161m (528feet) |
| Dam Volume: | 13700000m2 |
| Spillway Type: | Service, gate-controlled |
| Construction Began: | 2000 |
| Opening: | 2008 |
| Cost: | $360 million USD |
| Owner: | Japan Water Agency |
| Res Name: | Tokuyama Reservoir |
| Res Capacity Total: | 660000000abbr=onNaNabbr=on |
| Res Catchment: | 254.5km2 |
| Res Surface: | 13km2 |
| Plant Coordinates: | 35.6342°N 136.4764°W |
| Plant Type: | C |
| Plant Operator: | Chubu Electric |
| Plant Turbines: | 1 x 23 MW, 1 x 130 MW Francis-type |
| Plant Capacity: | 153 MW |
| Plant Commission: | 2014-2015 |
| Location Map: | Japan |
| Coordinates: | 35.6653°N 136.5022°W |
The is an embankment dam near Ibigawa, Ibi District, Gifu Prefecture in Japan. The dam was completed in 2008 and will support a 153 MW hydroelectric power station that is expected to be fully operational in 2015. Unit 1 at 23 MW was commissioned in May 2014. The dam was originally intended to withhold the upper reservoir of a 400 MW pumped-storage power station until a design change in 2004. The dam is also intended for flood control and water supply. It is the largest dam by structural volume in Japan and withholds the country's largest reservoir by volume as well.[1]
In December 1957, Electric Power Development Company (J-Power) selected the Ibi River for study at the 23rd Electric Power Development Coordinating Meeting. By May 1976, the Ministry of Construction released their bulletin "Policy on Tokuyama Dam Construction Project". In December 1982, the project was incorporated into the Electric Power Development Basic Plan.[2] It was approved by the government in 1998.[3] The original project was a pumped-storage hydroelectric scheme which consisted of the Tokuyama Dam as the upper reservoir, the Sugihara Dam as the lower and the 400 MW Sugihara Power Plant.
The dam is named after the village that was flooded by the construction of the dam.
Construction on the dam started in May 2000 but by May 2004 J-Power and Chubu Electric announced they had changed the design of the project due to the concerns and protests of locals and groups. Instead of the pumped-storage hydroelectric scheme, only the Tokuyama Dam was to be constructed with a 153-MW conventional power station. Subsequently, the Sugihara Dam and Sugihara Power Plant were scrapped from the project. During construction, the 503m (1,650feet) long Tokunoyama Hattoku Bridge was constructed upstream. With improved techniques and equipment, fill for the dam was laid at a pace of 6200000m2 per year, enabling the dam to be constructed in 26 months. Sediment from the Yokoyama Dam's reservoir was used as fill as well.[1] In September 2006 initial filling of the reservoir behind the Tokuyama Dam began and by June 2008, the dam was complete. Filling was complete in September. In October of the same year, J-Power passed oversight of the power station construction to Chubu.[2] [4] The first generator, Unit 1, was commissioned on 15 May 2014. Unit 2 should be commissioned by June 2015.[5]
The Tokuyama Dam is a 427.1m (1,401.2feet) long and 161m (528feet) high rock-fill embankment dam with a clay core. The total structural volume of the dam is 13700000m2. The dam creates a reservoir with a 660000000m2 capacity, surface area of 13km2 and catchment area of 254.5km2.[1] The dam will support two Francis turbine-generators, one with a 130 MW capacity which will be located in an underground power station downstream. The second is an operational 23 MW generator and is located at the base of the dam. The installed capacity of both will be 153 MW. The power station will process a maximum of 100m3/s for power production.[2]