Okutadami Dam
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| Okutadami Dam | |
|---|---|
 | |
  Location of Okutadami Dam in Japan | |
| Country | Japan |
| Location | Uonuma |
| Coordinates | 37°09′12″N 139°15′00″E / 37.15333°N 139.25000°E |
| Construction began | 1953 |
| Opening date | 1961 |
| Owner(s) | Electric Power Development Company |
| Dam and spillways | |
| Type of dam | Gravity |
| Impounds | Tadami River |
| Height | 157 m (515 ft) |
| Length | 475 m (1,558 ft) |
| Dam volume | 1,636,000 m3 (2,139,807 cu yd) |
| Reservoir | |
| Creates | Lake Okutadami |
| Total capacity | 601,000,000 m3 (487,239 acre⋅ft) |
| Active capacity | 458,000,000 m3 (371,307 acre⋅ft) |
| Catchment area | 595 km2 (230 sq mi) |
| Surface area | 1,150 ha (2,842 acres)[1] |
| Normal elevation | 750 m (2,461 ft) |
| Power Station | |
| Commission date | 1960, 2003 |
| Hydraulic head | 120 MW units: 170 m (558 ft) 200 MW unit: 164.2 m (539 ft) |
| Turbines | 3 x 120 MW, 1 x 200 MW Francis-type |
| Installed capacity | 560 MW |
The Okutadami Dam (奥只見ダム) is a concrete gravity dam on the Tadami River, 26 km (16 mi) east of Uonuma on the border of Niigata and Fukushima Prefectures, Japan. The primary purpose of the dam is hydroelectric power generation and it supports a 560 MW power station which is the largest conventional hydroelectric power station in Japan.[2] The dam also forms the second largest reservoir in Japan, next to that of the Tokuyama Dam.[3]
Construction on the dam began and its original 390 MW power station was commissioned 2 December 1960. The rest of the project was complete in 1961. Between 1999 and 2003, the power station was expanded, adding 200 MW in installed capacity. In addition, a 2.7 MW generator was added to ensure a flow of 2.5 m3/s (88 cu ft/s) downstream for environmental purposes.[2] Along with the same power plant upgrade, a second Kaplan turbine-generator was added to the 83 m (272 ft) tall Otori Dam's power station downstream at 37°12′53″N 139°12′50″E / 37.21472°N 139.21389°E. This generator has an 87 MW capacity in addition to the existing 95 MW unit, for an installed capacity of 182 MW.[4]
36 houses were submerged.
