| Okukubi Dam | |
|---|---|
 Downstream face of the dam in July 2011 | |
| Official name | 億首ダム |
| Country | Japan |
| Location | Kin, Okinawa |
| Coordinates | 26°27′54″N 127°55′54″E / 26.46500°N 127.93167°E |
| Status | Operational |
| Construction began | 2009 |
| Opening date | March 2013 |
| Construction cost | ¥3 billion (US$38.2 million) |
| Owner(s) | Development and Construction Department, Okinawa General Bureau |
| Dam and spillways | |
| Impounds | Okukubi River |
| Height | 39 m (128 ft) |
| Length | 462 m (1,516 ft) |
| Elevation at crest | 29 m (95 ft) |
| Dam volume | 339,000 m3 (443,395 cu yd) |
| Spillway type | Labyrinth weir |
| Spillway capacity | 430 m3/s (15,185 cu ft/s) |
| Reservoir | |
| Total capacity | 8,560,000 m3 (6,940 acre⋅ft) |
| Active capacity | 7,860,000 m3 (6,372 acre⋅ft) |
| Catchment area | 14.6 km2 (6 sq mi) |
| Surface area | 0.61 km2 (0 sq mi)[1] |
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.[2][3] It is the first trapezoidal CSG-type to be constructed as a main dam in the world.[4][5] Its purpose is to provide flood control and water for municipal use along with the irrigation of 70 ha (173 acres) of land.[6]
- ^ "Okukubi Dam Overview" (in Japanese). TAISEI Corporation. Archived from the original on 28 March 2012. Retrieved 24 July 2011.
- ^ Cite error: The named reference
constrwas invoked but never defined (see the help page). - ^ "okukubi Dam flood high water reached!". Sarutra. 1 April 2013. Retrieved 2 August 2013.
- ^ "Okukubi Dam is the world's first trapezoidal CSG dam". North Dam Construction Office. Retrieved 24 July 2011.
- ^ (Organised by Spanish National Committee on Large Dams -SPANCOLD), Edited by L. Berga (2003). Roller compacted concrete dams : proceedings of the IV International Symposium on Roller Compacted Concrete (RCC) Dams, 17-19 November 2003, Madrid, Spain. Rotterdam [u.a.]: Balkema. p. 27. ISBN 90-5809-564-9.
{{cite book}}:|first=has generic name (help) - ^ "Purpose". North Dam Construction Office. Retrieved 24 July 2011.
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