Fukuji Dam

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.[2]

Fukuji Dam
Official name福地ダム
CountryJapan
LocationHigashi, Okinawa
Coordinates26°38′51″N 128°10′27″E
StatusOperational
Construction began1969
Opening date1974
Dam and spillways
Type of damEmbankment, rock-fill
ImpoundsFukuchi River
Height92 m (302 ft)
Length260 m (853 ft)
Elevation at crest90 m (295 ft)
Dam volume1,622,000 m3 (2,121,496 cu yd)
Reservoir
Total capacity55,000,000 m3 (44,589 acre⋅ft)
Active capacity52,000,000 m3 (42,157 acre⋅ft)
Catchment area32 km2 (12 sq mi)
Surface area3 km2 (1 sq mi)[1]

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.[3] The dam was completed in 1972, and the auxiliary spillway in December 1974.[3] The dam was later raised to accommodate an improved intake and an additional 2.4 m (8 ft) in water elevation. This additional work was completed in 1991.[4]

Design

The dam is a 92 m (302 ft) tall and 260 m (853 ft) long rock-fill embankment type with a structural volume of 1,622,000 m3 (2,121,496 cu yd) and a crest elevation of 90 m (295 ft). The dam sits at the head of a 32 km2 (12 sq mi) catchment area and its reservoir has a surface area of 3 km2 (1 sq mi). The reservoir's capacity is 55,000,000 m3 (44,589 acre⋅ft) while 52,000,000 m3 (42,157 acre⋅ft) serves as active (or "useful") capacity.[1] The dam is equipped with a drum gate-controlled chute spillway. On the eastern edge of the reservoir, 6.3 km (4 mi) east of the dam, there is an auxiliary spillway at 26°38′15″N 128°14′12″E. This spillway is a siphon-type and operates automatically to help drain the reservoir during flooding. It has a 900 m3/s (31,783 cu ft/s) capacity and discharges directly into the Pacific Ocean.[5]

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gollark: I think because the main advantage was that it wouldn't produce neutrons in some sort of fusion reaction, and neutrons cause problems, except it still would because of the fuels each fusing with themselves.
gollark: I think I read somewhere that it wasn't very useful (he3) but i forgot why.
gollark: I too want vast swathes of land to be covered in generators which will not even work half the time because of "night" and "poor weather", which are hilariously energy-expensive to produce in the first place, and which will break after 40 years.
gollark: I mean, in a sense, maybe it is.

References
  1. "Key Features of Dams in Okinawa". North Dam Construction Office. Archived from the original on 27 September 2011. Retrieved 24 July 2011.
  2. "Fukuchi Dam" (in Japanese). DamMania. Retrieved 26 July 2011.
  3. "Fukuchi Dam" (in Japanese). Japan Dam Handbook. Retrieved 25 July 2011.
  4. "Fukuchi Dam" (in Japanese). Okinawa General Bureau North Dam Integrated Office. Archived from the original on 28 August 2011. Retrieved 25 July 2011.
  5. "Fukuji Dam Upstream Spillway" (in Japanese). Okinawa General Bureau North Dam Integrated Office. Archived from the original on 27 September 2011. Retrieved 25 July 2011.
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