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Okutadami, Uonuma

(4.1/5 based on 25+ reviews on the web)
The Okutadami Dam is a concrete gravity dam on the Tadami River, 26km 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. The dam also forms the second largest reservoir in Japan, next to that of the Tokuyama Dam.BackgroundConstruction on the dam began and its original 360 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 2.5m3/s downstream for environmental purposes. Along with the same power plant upgrade, a second Kaplan turbine-generator was added to the 83m tall Otori Dam's power station downstream at. This generator has an 87 MW capacity in addition to the existing 95 MW unit, for an installed capacity of 182 MW.DesignThe Okutadami Dam is a 157m tall and 475m long concrete gravity dam with a structural volume of 1636000m3. Sitting at the head of a 595km2 catchment area, the dam creates a reservoir with a 601000000m3 capacity of which 458000000m3 is active (or "useful") storage. The reservoir has a surface area of 1150ha. The power station is underground and located on the right bank of the river next to the dam's abutment. It consists of two underground caverns, one for the original power station and another adjacent for the expansion. After being received by the dam's intake, water supplied to the original power plant travels down three penstocks 185- in length before reaching an individual 120 MW Francis turbine-generator. The 200 MW Francis turbine-generator receives water via a 280m long penstock. After water is processed through the generators, its travels down two tailrace tunnels before being discharged over 3km downstream at the upstream edge of the Otori Reservoir.
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Reviews
TripAdvisor
  • The tunnel tour bus finally surechigaeru! Originally okutadami Lake power dam construction and the plant because it could not afford a tall high decker bus is a great thrill and techniques required! It is a trick of taxi. Seeing veteran, rodecker proactive it was our bus is glad tunnel trip! Instinctively, this operation is a tourist!  And guide many times I'm in I mentioned. And Lake okutadami is arrived! Large scale rallying power of Japan as well as more than sunlight, autumn!  Just bought a Smartphone in the pics more than 100 copies. Not from the upstream dam tired of 45, autumn! I had such big leaves? I was a frog! Is it Japan, is more awesome fall foliage? EH! There's three big leaves? No? Answer, no. Anyway surprised at the size of the scale, from scaly okutadami Lake was impressed.
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  • Sunny and leaves towards the top of the mountain at the end of October, but was the last leaves, very clean. Is a special flight that have lined the cruise ship, did not wait for it. 30-minute course was insisting on a longer course next time. Spring is beautiful and I want to go again. 80% of the silver line, however, going to the Lake okutadami so narrow and dark tunnels, we expect
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  • Okutadami Lake stayed at Oyu Onsen, so very hard to go tried ready. Oku Tadami silver line tunnel is the most much wider road because passing cars and may use the nerves a little. At the end is the souvenir shop 2-3, from there walk uphill from Lake okutadami one-way pay 100 yen, a slope car cable car rides take about 5 minutes. Recommend weaker leg elevation is 50 m because the. Walk on a boat ride soon.
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