Okutadami Dam
| Okutadami 奥 只見 ダ ム |
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| Coordinates | 37 ° 9 ′ 12 ″ N , 139 ° 15 ′ 0 ″ E | ||||||||
| Data on the structure | |||||||||
| Lock type: | Gravity dam | ||||||||
| Construction time: | 1953-1961 | ||||||||
| Height of the barrier structure : | 157 m | ||||||||
| Building volume: | 1.636 million m³ | ||||||||
| Crown length: | 475 m | ||||||||
| Power plant output: | 560 MW (3 × 120, 1 × 200 MW) | ||||||||
| Operator: | Electric Power Development Company | ||||||||
| Data on the reservoir | |||||||||
| Altitude (at congestion destination ) | 750 m | ||||||||
| Water surface | 11.5 km² | ||||||||
| Storage space | 601 million m³ | ||||||||
| Catchment area | 595 km² | ||||||||
The Okutadami Dam ( Japanese 奥 只見 ダ ム , Okutadami-damu ) is a dam on the Tadami in Japan. The concrete gravity dam is 26 km east of Uonuma on the border between the two prefectures Niigata and Fukushima . The main purpose of the dam is to generate electricity in a hydropower plant , which with its nominal output of 560 MW is one of the largest in Japan (excluding pumped storage power plants ). The reservoir is also one of the largest in Japan, after that of Tokuyama .
history
In the first construction phase, a 360 MW power plant was completed and commissioned on December 2, 1960. The remaining construction work ended in 1961. Between 1999 and 2003 the plant was expanded by installing an additional 200 MW of power. A 2.7 MW generator was also added to ensure a minimum discharge of 2.5 m³ / s for environmental reasons .
Technical specifications
The Okutadami barrier structure is a 157 m high and 475 m long dam wall with a concrete volume of 1.636 million m³. It stands at the end of a 595 km² catchment area and creates a reservoir with 601 million m³ of storage capacity, of which 458 million m³ are usable space. The water surface is 1150 hectares. The power plant is located underground on the right bank of the river below the dam. It consists of two underground caverns , one for the original power plant and one for expansion. The water for the old power plant flows behind the intake structure through three 185 to 189 m long pressure pipes before each reaches its own 120 MW Francis turbine with generator. The newer 200 MW Francis turbine generator receives its water through a 280 m long pressure pipe. After the water has passed the generators, it flows through two drainage tunnels before being drained 3 km downstream to the top of the Otori reservoir. The hydraulic head is 170 m for the three 120 MW units and 164.2 m for the 200 MW unit.
Individual evidence
- ↑ a b Start of Commercial Operation of the Okutadami (Extension) and Otori (Extension) Hydropower Plants and of the Okutadami-dam Ecological Flow Hydropower Plan , J-Power (PDF file; 25 kB), accessed on December 13, 2011
- ↑ DamMania Okutadami Dam , accessed December 8, 2011 (Japanese)
- ↑ Case study 01-02: Biological Diversity - Okutadami and Ohtori Expansion Hydropower Project, Japan ( Memento of the original from October 3, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 5.2 MB), IEA Hydropower Implementing Agreement Annex VIII: Hydropower Good Practices: Environmental Mitigation Measures and Benefit, New Energy Foundation, 2006, accessed on August 14, 2011
Remarks
- ↑ engl. Tadami River
See also
- List of the largest dams on earth
- List of the largest reservoirs on earth
- List of the largest hydroelectric plants in the world
- List of dams in the world
- Echigo Sanzan Tadami Quasi National Park
Web links
- Dam Mania: Okutadami , accessed December 8, 2011 (Japanese)
- Japan Dam Handbook: Okutadami , accessed December 8, 2011 (Japanese)