Tokuyama Dam
Encyclopedia
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 complete in 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.
(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. It was approved by the government in 1998. 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.
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 would 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 503 m (1,650.3 ft) long Tokunoyama
Hattoku Bridge was constructed upstream. With improved techniques and equipment, fill for the dam was laid at a pace of 6200000 cubic metre per year, enabling the dam to be constructed in 26 months. Sediment from the Yokoyama Dam
's reservoir was used as fill as well. 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.
with a 660000000 cubic metre capacity, surface area of 13 km² (5 sq mi) and catchment area of 254.5 km² (98.3 sq mi). The dam's power station will contain two turbine generator
s, one with a 130 MW capacity and another with a 23 MW capacity for a total of 153 MW. The power station will process a maximum of 100 m3/s for power production. The power station is expected to be operational in 2014.
Embankment dam
An embankment dam is a massive artificial water barrier. It is typically created by the emplacement and compaction of a complex semi-plastic mound of various compositions of soil, sand, clay and/or rock. It has a semi-permanent waterproof natural covering for its surface, and a dense, waterproof...
near Ibigawa
Ibigawa, Gifu
is a town located in Ibi District, Gifu Prefecture, Japan.On January 31, 2005 the former villages of Fujihashi, Kasuga, Kuze, Sakauchi, and Tanigumi merged with Ibigawa, resulting in a nearly 20-fold increase in area....
, Ibi District
Ibi District, Gifu
is a district located in Gifu, Japan., the district has an estimated population of 72,109. The total area is 876.65 km².The area of the former village of Tokuyama in this district will be flooded by the Tokuyama Dam.-District Timeline:...
, Gifu Prefecture
Gifu Prefecture
is a prefecture located in the Chūbu region of central Japan. Its capital is the city of Gifu.Located in the center of Japan, it has long played an important part as the crossroads of Japan, connecting the east to the west through such routes as the Nakasendō...
in Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
. The dam was completed in 2008 and will support a 153 MW hydroelectric power station
Power station
A power station is an industrial facility for the generation of electric energy....
that is expected to be complete in 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
Flood control
In communications, flood control is a feature of many communication protocols designed to prevent overwhelming of a destination receiver. Such controls can be implemented either in software or in hardware, and will often request that the message be resent after the receiver has finished...
and water supply
Water supply
Water supply is the provision of water by public utilities, commercial organisations, community endeavours or by individuals, usually via a system of pumps and pipes...
. It is the largest dam by structural volume in Japan and withholds the country's largest reservoir by volume as well.
History
In December 1957, Electric Power Development CompanyElectric Power Development Company
The , operating under the brand name J-POWER, formerly , is the largest electric utility in Japan. It mainly produces Electricity from Coal and Hydroelectric Power Stations. It also has a few wind farms and is currently building a nuclear plant in Ohma, Aomori prefecture, that is scheduled to...
(J-Power) selected the Ibi River
Ibi River
The is a tributary of the Kiso River located in Gifu and Mie Prefectures in Japan. Along with the Nagara and Kiso rivers, the Ibi is the third of the Kiso Three Rivers of the Nōbi Plain. It is one of Japan's first-class rivers...
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. It was approved by the government in 1998. The original project was a pumped-storage hydroelectric
Pumped-storage hydroelectricity
Pumped-storage hydroelectricity is a type of hydroelectric power generation used by some power plants for load balancing. The method stores energy in the form of water, pumped from a lower elevation reservoir to a higher elevation. Low-cost off-peak electric power is used to run the pumps...
scheme which consisted of the Tokuyama Dam as the upper reservoir
Reservoir
A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...
, the Sugihara Dam as the lower and the 400 MW Sugihara Power Plant.
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 would 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 503 m (1,650.3 ft) long Tokunoyama
Hattoku Bridge was constructed upstream. With improved techniques and equipment, fill for the dam was laid at a pace of 6200000 cubic metre per year, enabling the dam to be constructed in 26 months. Sediment from the Yokoyama Dam
Yokoyama Dam
is a dam in Ibigawa, in the Gifu Prefecture of Japan....
's reservoir was used as fill as well. 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.
Design
The Tokuyama Dam is a 427.1 m (1,401.2 ft) long and 161 m (528.2 ft) high rock-fill embankment dam with a clay core. The total structural volume of the dam is 13700000 cubic metre. The dam creates a reservoirReservoir
A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...
with a 660000000 cubic metre capacity, surface area of 13 km² (5 sq mi) and catchment area of 254.5 km² (98.3 sq mi). The dam's power station will contain two turbine generator
Generator
Generator may refer to:* Electrical generator* Engine-generator, an electrical generator, but with its own engine.* Generator , any of several closely related usages in mathematics.Computing:...
s, one with a 130 MW capacity and another with a 23 MW capacity for a total of 153 MW. The power station will process a maximum of 100 m3/s for power production. The power station is expected to be operational in 2014.