Haneji Dam
dam in Japan
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.
History
Planning for the dam was conducted in the late 1960s by the U.S. Army Corps of Engineers and construction on the dam began in 1981. Construction on the river diversion tunnels commenced in 1993 and work on the dam's body began in 1998. The body of the dam was complete in 2000 and the entire project in 2004.
Design
The dam is a 67 m (220 ft) tall and 198 m (650 ft) long rock-fill embankment type with a structural volume of 1,050,000 m3 (1,373,348 cu yd) and a crest elevation of 74 m (243 ft). The dam sits at the head of an 11 km2 (4 sq mi) catchment area and its reservoir has a surface area of 1 km2 (247 acres). The reservoir's capacity is 19,800,000 m3 (16,052 acre⋅ft) while 19,200,000 m3 (15,566 acre⋅ft) serves as active (or "useful") capacity. The dam is equipped with an uncontrolled chute spillway.
Innovations
The dam and its facilities are equipped with several innovations to improve water quality and the environment.
“Haneji Dam” enters the record as dam in Japan. Crown Archives preserves that source wording while asking what Haneji and Japan can confirm, complicate or overturn.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 1, 2026. The linked authority identifier is Q5647761. Authority coordinates are 26.607, 128.022. 1 of 2 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1981, 1993, 1998 and 2000.
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This entry incorporates text from “Haneji Dam” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.