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Okinawa Island, officially Okinawa Main Island, is the largest of the Okinawa Islands and the Ryukyu (Nansei) Islands of Japan in the Kyushu region. It is the smallest and least populated of the five main islands of Japan. The island is approximately 106 kilometres (66 mi) long, an average 11 kilometres (7 mi) wide, and has an area of 1,206.98 square kilometers (466.02 sq mi). It is roughly 640 kilometres south of the main island of Kyushu and the rest of Japan. It is 500 km northeast of Taiwan. The total population of Okinawa Island is 1,384,762. The Greater Naha area has roughly 800,000 residents, while the city itself has about 320,000 people. Naha is the seat of Okinawa Prefecture on the southwestern part of Okinawa Island. Okinawa has a humid subtropical climate.
The Arakawa River or Ara River is a 173-kilometre (107 mi) long river that flows through Saitama Prefecture and Tokyo. Its average flow in 2002 was 30m³/s.
The Blue Mountains Dams are a series of six dams in the Blue Mountains which supply water to the Blue Mountains and Sydney, Australia. The Dams are managed by the WaterNSW. Water in this scheme may be supplemented from the Fish River Scheme.
The Okukubi Dam (億首ダム) is a trapezoidal cemented, sand and gravel (CSG) dam on the Okukubi River in Kin, Okinawa Prefecture, Japan. Construction began in 2009 and its reservoir was filled by 31 March 2013. It is the first trapezoidal CSG-type to be constructed as a main dam in the world. Its purpose is to provide flood control and water for municipal use along with the irrigation of 70 ha of land.
The Kanna Dam (漢那ダム) is a concrete gravity dam on the Kanna River in Ginoza, Okinawa Prefecture, Japan. The purpose of the dam is water supply and flood control. After studies were carried out in the 1970s(starting in 1973 and ending in 1978), construction on the dam began in 1982 and it was completed in 1992. The dam is 45 m (148 ft) tall and 185 m (607 ft) long. In order to retain the reservoir, a 37 m (121 ft) tall and 500 m (1,640 ft) long saddle dam was constructed directly northeast of the dam. A fish ladder was installed on the dam during construction to assist the migration of fish, shrimp and crabs. Mangroves downstream of the dam were restored after construction and the area is a tourist destination along with a habitat for water fowl.
The Fukuji Dam (福地ダム) or Fukuchi Dam is a rock-fill embankment dam on the Fukuchi River 2.5 km (2 mi) northeast of Higashi, Okinawa Prefecture, Japan. The purpose of the dam, the tallest in Okinawa, is water supply and flood control.
The Haneji Dam (羽地ダム) is a rock-fill embankment dam on the Haneji River in Nago, Okinawa Prefecture, Japan. The purpose of the dam is flood control and water supply.
The Shin-Takasegawa Pumped Storage Station (新高瀬川発電所) uses the Takase River to operate a pumped storage hydroelectric scheme about 12 kilometres (7.5 mi) west of Ōmachi in Nagano Prefecture, Japan. Part of the system is within Chūbu-Sangaku National Park.
The Arakawa River is a river in Fukushima, Fukushima, Japan.
Events in the year 1900 in Japan. It corresponds to Meiji 33 (明治33年) in the Japanese calendar.
Events in the year 1896 in Japan. It corresponds to Meiji 29 (明治29年) in the Japanese calendar.
Kakkaku dam is a gravity dam located in Saitama prefecture in Japan. The dam was constructed to control flood and to supply drinking water. The catchment area of the dam is 32.1 km2. The dam impounds about 56 ha of land when full and can store 10.25 million cubic meters of water. The construction of the dam was started on 1970 and completed in 2001.
Urayama dam is a roller compacted concrete gravity dam located in Saitama prefecture in Japan. The dam serves for multiple purpose including water-supply for domestic purpose, power generation, and flood control. The catchment area of the dam is 51.6 km2. The dam impounds about 120ha of land when full and can store 58 million cubic meters of water. The construction of the dam was started on 1972 and completed in 1988. The dam is constructed across the Urayama river which is a tributary of Arakawa River.
Aha Dam (Japanese:アハダム)is a concrete gravity dam located in Okinawa prefecture of Japan. The dam is used to collect drinking water for water supply, irrigation and flood control. The catchment area of the dam is 39.5 km2. The dam impounds about 83 ha of land when full and can store 18.6 million cubic meters of water. The construction of the dam started on 1971 and completed in 1982.
Benoki Dam is a combination of gravity and fill dam located in Okinawa prefecture in Japan. The dam is used for flood control, water supply and irrigation. The catchment area of the dam is 8.1 km2. The dam impounds about 50 ha of land when full and can store 4500 thousand cubic meters of water. The construction of the dam was started on 1975 and completed in 1987.
Kurashiki Dam is a rock-fill dam located in Okinawa prefecture in Japan. The dam is used for flood control and water supply. The catchment area of the dam is 104.7 km2. The dam impounds about 77 ha of land when full and can store 7100 thousand cubic meters of water. The construction of the dam was started on 1979 and completed in 1994.
Taiho Dam is a concrete gravity dam located in Okinawa prefecture in Japan. The dam is used for flood control and water supply. The catchment area of the dam is 13.3 km2. The dam impounds about 89 ha of land when full and can store 20050 thousand cubic meters of water. The construction of the dam was started on 1987 and completed in 2010.
Higashi Arakawa Dam is a gravity dam located in Tochigi prefecture in Japan. The dam is used for flood control, irrigation, water supply and power production. The catchment area of the dam is 21 km2. The dam impounds about 37 ha of land when full and can store 6100 thousand cubic meters of water. The construction of the dam was started on 1974 and completed in 1990.
Arakawa Dam is a rockfill dam located in Yamanashi Prefecture in Japan. The dam is used for flood control and water supply. The catchment area of the dam is 126.4 km2. The dam impounds about 41 ha of land when full and can store 10800 thousand cubic meters of water. The construction of the dam was started on 1973 and completed in 1985.
References
- ↑ "Arakawa Dam ［Okinawa Pref.］ - Dams in Japan" . Retrieved 2022-02-24.
- ↑ BRAZIL, Mark (1985). "Notes on the Okinawa Rail Rallus okinawae: Observations at night and at dawn". Japanese Journal of Ornithology. 33 (4): 125–127. doi: 10.3838/jjo1915.33.125 . ISSN 0040-9480.
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