:Fukuji Dam
{{Infobox dam
| name = Fukuji Dam
| name_official = 福地ダム
| image = Fukuji Dam 1 Okinawa.jpg
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| coordinates = {{coord|26|38|51|N|128|10|27|E|type:landmark|display=inline,title}}
| country = Japan
| location = Higashi, Okinawa
| status = O
| construction_began = 1969
| opening = 1974
| demolished =
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| dam_type = Embankment, rock-fill
| dam_height = {{Convert|92|m|ft|0|abbr=on}}
| dam_height_thalweg =
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| dam_length = {{Convert|260|m|ft|0|abbr=on}}
| dam_width_crest =
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| dam_volume = {{Convert|1622000|m3|cuyd|0|abbr=on}}
| dam_elevation_crest = {{Convert|90|m|ft|0|abbr=on}}
| dam_crosses = Fukuchi River
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| res_name =
| res_capacity_total = {{Convert|55000000|m3|acre.ft|0|abbr=on}}
| res_capacity_active = {{Convert|52000000|m3|acre.ft|0|abbr=on}}
| res_capacity_inactive=
| res_catchment = {{Convert|32|km2|sqmi|0|abbr=on}}
| res_surface = {{Convert|3|km2|sqmi|0|abbr=on}}{{cite web|title=Key Features of Dams in Okinawa|url=http://www.dc.ogb.go.jp/hokudamu/e/element.html|publisher=North Dam Construction Office|accessdate=24 July 2011|url-status=dead|archiveurl=https://web.archive.org/web/20110927062557/http://www.dc.ogb.go.jp/hokudamu/e/element.html|archivedate=27 September 2011}}
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The {{nihongo|Fukuji Dam|福地ダム}} or Fukuchi Dam is a rock-fill embankment dam on the Fukuchi River {{Convert|2.5|km|mi|0|abbr=on}} northeast of Higashi, Okinawa Prefecture, Japan. The purpose of the dam, the tallest in Okinawa, is water supply and flood control.{{cite web|title=Fukuchi Dam|date=31 December 2010 |url=http://dammania.net/okinawa/fukuji.html|publisher=DamMania|accessdate=26 July 2011|language=Japanese}}
Background
Under the Ryukyu Domestic Water Corporation, the U.S. Army Corps of Engineers began constructing the dam in 1969. After the United States Civil Administration of the Ryukyu Islands returned administration of Okinawa back to Japan in 1972, construction became the responsibility of the Japanese government. The dam was completed in 1972, and the auxiliary spillway in December 1974.{{cite web|title=Fukuchi Dam|url=http://damnet.or.jp/cgi-bin/binranA/All.cgi?db4=2894|publisher=Japan Dam Handbook|accessdate=25 July 2011|language=Japanese}} The dam was later raised to accommodate an improved intake and an additional {{Convert|2.4|m|ft|0|abbr=on}} in water elevation. This additional work was completed in 1991.{{cite web|title=Fukuchi Dam|url=http://www.dc.ogb.go.jp/toukan/01dam/fukuji.htm|publisher=Okinawa General Bureau North Dam Integrated Office|accessdate=25 July 2011|language=Japanese|archive-url=https://web.archive.org/web/20110828083918/http://www.dc.ogb.go.jp/toukan/01dam/fukuji.htm|archive-date=28 August 2011|url-status=dead}}
Design
The dam is a {{Convert|92|m|ft|0|abbr=on}} tall and {{Convert|260|m|ft|0|abbr=on}} long rock-fill embankment type with a structural volume of {{Convert|1622000|m3|cuyd|0|abbr=on}} and a crest elevation of {{Convert|90|m|ft|0|abbr=on}}. The dam sits at the head of a {{Convert|32|km2|sqmi|0|abbr=on}} catchment area and its reservoir has a surface area of {{Convert|3|km2|sqmi|0|abbr=on}}. The reservoir's capacity is {{Convert|55000000|m3|acre.ft|0|abbr=on}} while {{Convert|52000000|m3|acre.ft|0|abbr=on}} serves as active (or "useful") capacity. The dam is equipped with a drum gate-controlled chute spillway. On the eastern edge of the reservoir, {{Convert|6.3|km|mi|0|abbr=on}} east of the dam, there is an auxiliary spillway at {{Coord|26|38|15|N|128|14|12|E|name=Fukuji Dam Auxiliary Siphon Spillway}}. This spillway is a siphon-type and operates automatically to help drain the reservoir during flooding. It has a {{Convert|900|m3/s|ft3/s|0|abbr=on}} capacity and discharges directly into the Pacific Ocean.{{cite web|title=Fukuji Dam Upstream Spillway|url=http://www.dc.ogb.go.jp/toukan/26damusisetu/fukuji/kouzuibaki.htm|publisher=Okinawa General Bureau North Dam Integrated Office|accessdate=25 July 2011|language=Japanese|archive-url=https://web.archive.org/web/20110927062709/http://www.dc.ogb.go.jp/toukan/26damusisetu/fukuji/kouzuibaki.htm|archive-date=27 September 2011|url-status=dead}}
References
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{{Commons category}}
{{Dams in Okinawa Prefecture}}
Category:Dams in Okinawa Prefecture