Okukubi Dam
| Okukubi Dam | |
|---|---|
Downstream face of the dam in July 2011 | |
Interactive map of Okukubi Dam | |
| 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) |
| Owners | 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) |
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 (173 acres) of land.