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Ōmachi Dam
The Ōmachi Dam is a concrete gravity dam on the just west of Ōmachi in Nagano Prefecture, Japan. Construction of the dam began in 1975 and it was completed in 1985. The primary purpose of the dam is water supply and it also supports a 13 MW hydroelectric power station. It is owned by TEPCO. See also *Shin-Takasegawa Pumped Storage Station The Shin-Takasegawa Pumped Storage Station (新高瀬川発電所) uses the Takase River (a tributary of the Shinano River) to operate a pumped storage hydroelectric scheme about west of Ōmachi in Nagano Prefecture, Japan. Part of the system is ... - upstream References {{DEFAULTSORT:Omachi Dam Dams in Nagano Prefecture Hydroelectric power stations in Japan Gravity dams Dams completed in 1985 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ōmachi, Nagano
is a Cities of Japan, city located in Nagano Prefecture, Japan. , the city had an estimated population of 27,559 in 11861 households, and a population density of 49 persons per km2. The total area of the city is . Geography Ōmachi is located west of Nagano, Nagano, Nagano, the capital of Nagano Prefecture, in the of the prefecture. The 3000 meter Northern Japanese Alps (or Hida Mountains) are to the west ranges to the west of the city and mountains of around 1000 meters form the eastern border. The Takase River runs through the city, which is located in the northern Matsumoto basin. The Itoigawa-Shizuoka Tectonic Line active fault system is also running through the city. *Mountains: Mount Yarigatake, , , , , , , , , , , *Rivers: Takase River *Lakes and marshes: (, , ) Surrounding municipalities *Nagano Prefecture ** Matsumoto, Nagano, Matsumoto ** Nagano, Nagano, Nagano ** Azumino, Nagano, Azumino ** Matsukawa, Nagano (Shimoina), Matsukawa ** Ikeda, Nagano, Ikeda ** Hakuba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TEPCO
, also known as or TEPCO, is a Japanese electric utility holding company servicing Japan's Kantō region, Yamanashi Prefecture, and the eastern portion of Shizuoka Prefecture. This area includes Tokyo. Its headquarters are located in Uchisaiwaicho, Chiyoda, Tokyo, and international branch offices exist in Washington, D.C., and London. It is a founding member of strategic consortiums related to energy innovation and research; such as JINED, INCJ and MAI. In 2007, TEPCO was forced to shut the Kashiwazaki-Kariwa Nuclear Power Plant after the Niigata-Chuetsu-Oki earthquake. That year it posted its first loss in 28 years. Corporate losses continued until the plant reopened in 2009. Following the 2011 Tōhoku earthquake and tsunami, one of its power plants was the site of one of the world's most serious ongoing nuclear disaster, the Fukushima Daiichi nuclear disaster. TEPCO could face ¥ ($) in special losses in the current business year to March 2012, and the Japanese government ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radial Gate
The Tainter gate is a type of radial arm floodgate used in dams and canal locks to control water flow. It is named for Wisconsin structural engineer Jeremiah Burnham Tainter. A side view of a Tainter gate resembles a slice of pie with the curved part of the piece facing the source or upper pool of water and the tip pointing toward the destination or lower pool. The curved face or skinplate of the gate takes the form of a wedge section of cylinder. The straight sides of the pie shape, the trunnion arms, extend back from each end of the cylinder section and meet at a trunnion which serves as a pivot point when the gate rotates. Pressure forces on a submerged body act perpendicular to the body's surface. The design of the Tainter gate results in every pressure force acting through the centre of the imaginary circle of which the gate is a section, so that all resulting pressure force acts through the pivot point of the gate, making construction and design easier. When a Tain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis-type
The Francis turbine is a type of water turbine. It is an inward-flow reaction turbine that combines radial and axial flow concepts. Francis turbines are the most common water turbine in use today, and can achieve over 95% efficiency. The process of arriving at the modern Francis runner design took from 1848 to approximately 1920. It became known as the Francis turbine around 1920, being named after British-American engineer James B. Francis who in 1848 created a new turbine design. Francis turbines are primarily used for producing electricity. The power output of the electric generators generally ranges from just a few kilowatts up to 1000 MW, though mini-hydro installations may be lower. The best performance is seen when the head height is between . Penstock diameters are between . The speeds of different turbine units range from 70 to 1000 rpm. A wicket gate around the outside of the turbine's rotating runner controls the rate of water flow through the turbine for diff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravity Dam
A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable and independent of any other dam section. Characteristics Gravity dams generally require stiff rock foundations of high bearing strength (slightly weathered to fresh), although in rare cases, they have been built on soil foundations. The bearing strength of the foundation limits the allowable position of the resultant force, influencing the overall stability. Also, the stiff nature of the gravity dam structure is unforgiving to differential foundation settlement, which can induce cracking of the dam structure. Gravity dams provide some advantages over embankment dams, the main advantage being that they can tolerate minor over-topping flows without damage, as the concre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nagano Prefecture
is a landlocked prefecture of Japan located in the Chūbu region of Honshū. Nagano Prefecture has a population of 2,052,493 () and has a geographic area of . Nagano Prefecture borders Niigata Prefecture to the north, Gunma Prefecture to the northeast, Saitama Prefecture to the east, Yamanashi Prefecture to the southeast, Shizuoka Prefecture and Aichi Prefecture to the south, and Gifu Prefecture and Toyama Prefecture to the west. Nagano is the capital and largest city of Nagano Prefecture, with other major cities including Matsumoto, Ueda, and Iida. Nagano Prefecture has impressive highland areas of the Japanese Alps, including most of the Hida Mountains, Kiso Mountains, and Akaishi Mountains which extend into the neighbouring prefectures. The abundance of mountain ranges, natural scenic beauty, and rich history has gained Nagano Prefecture international recognition as a world-class winter sports tourist destination, including hosting the 1998 Winter Olympics and a new ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shin-Takasegawa Pumped Storage Station
The Shin-Takasegawa Pumped Storage Station (新高瀬川発電所) uses the Takase River (a tributary of the Shinano River) to operate a pumped storage hydroelectric scheme about west of Ōmachi in Nagano Prefecture, Japan. Part of the system is within Chūbu-Sangaku National Park. Construction on the complex began in 1971, concluded in 1978 and the power station was commissioned in 1980. The power plant has a installed capacity and its upper reservoir is created by the Takase Dam, a rock-fill dam — which at in height is the tallest of its type in Japan. It is also the second tallest dam in Japan, next to Kurobe Dam. Design and operation When energy demand is low and therefore electricity less expensive, the turbines reverse and pump water from the lower reservoir back into the upper reservoir. This process repeats depending upon energy demand and water availability. Water released from the lower reservoir is used to power the Nakanosawa Power Station which uses of hydraul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dams In Nagano Prefecture
A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect or store water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC. The word ''dam'' can be traced back to Middle English, and before that, from Middle Dutch, as seen in the names of many old cities, such as Amsterdam and Rotterdam. History Ancient dams Early dam building took place in Mesopotamia and the Middle East. Dams were used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydroelectric Power Stations In Japan
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and also more than nuclear power. Hydropower can provide large amounts of low-carbon electricity on demand, making it a key element for creating secure and clean electricity supply systems. A hydroelectric power station that has a dam and reservoir is a flexible source, since the amount of electricity produced can be increased or decreased in seconds or minutes in response to varying electricity demand. Once a hydroelectric complex is constructed, it produces no direct waste, and almost always emits considerably less greenhouse gas than fossil fuel-powered energy plants. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravity Dams
A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable and independent of any other dam section. Characteristics Gravity dams generally require stiff rock foundations of high bearing strength (slightly weathered to fresh), although in rare cases, they have been built on soil foundations. The bearing strength of the foundation limits the allowable position of the resultant force, influencing the overall stability. Also, the stiff nature of the gravity dam structure is unforgiving to differential foundation settlement, which can induce cracking of the dam structure. Gravity dams provide some advantages over embankment dams, the main advantage being that they can tolerate minor over-topping flows without damage, as the concre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
