Miranda Dam

Miranda Dam
Location of Miranda Dam in Portugal
Official name Barragem de Miranda
Location municipality Miranda do Douro, Bragança District, Portugal
Coordinates 41°29′19″N 6°15′56.2″W / 41.48861°N 6.265611°W / 41.48861; -6.265611Coordinates: 41°29′19″N 6°15′56.2″W / 41.48861°N 6.265611°W / 41.48861; -6.265611
Status Operational
Construction began 1955
Opening date 1961
Owner(s) Companhia Portuguesa de Produção de Electricidade
Dam and spillways
Type of dam Concrete buttress dam
Impounds Douro
Height 80 m (260 ft)
Length 263 m (863 ft)
Dam volume 240,000 m3 (8,500,000 cu ft)
Spillway type Over the dam
Spillway capacity 11,000 m³
Reservoir
Total capacity 28,100,000 m3 (22,800 acre·ft)
Active capacity 6,660,000 m3 (5,400 acre·ft)
Surface area 1.22 km2 (0.47 sq mi)
Power station
Operator(s) Energias de Portugal
Commission date Miranda I: 1960
Miranda II: 1995
Hydraulic head Miranda I: 66 m (217 ft) (max)
Miranda II: 60 m (200 ft) (max)
Turbines Miranda I: 3 x 58.84 MW Francis-type
Miranda II: 193 MW Francis-type
Installed capacity Miranda I: 180 MW
Miranda II: 189 MW
Annual generation Miranda I + II: 897.8 GWh

Miranda Dam (Portuguese: Barragem de Miranda) is a concrete buttress dam on the Douro, where the river forms the national border line between Spain and Portugal. It is located in the municipality Miranda do Douro, in Bragança District, Portugal.

Construction of the dam began in 1955. The dam was completed in 1961. It is owned by Companhia Portuguesa de Produção de Electricidade (CPPE).[1]

Dam

Miranda Dam is a 80 m tall (height above foundation) and 263 m long buttress dam with a crest altitude of 535 m. The volume of the dam is 240,000 m³. The dam contains 4 crest spillways (maximum discharge 11,000 m³/s) and one bottom outlet.[1]

Reservoir

At full reservoir level of 528.05 m (maximum flood level of 533 m) the reservoir of the dam has a surface area of 1.22 km² and its total capacity is 28.1 mio. m³ (active capacity 6.66 mio. m³).[1]

Power plant

The power plant went operational in 1960. It is a run-of-the-river hydroelectric power station. It is owned by CPPE, but operated by EDP.[2] The plant has a nameplate capacity of 369[3][4] (390)[1][2] MW. Its average annual generation is 897.8[3] (879[4] or 1,036.3[1][2]) GWh.

Miranda I

The power station contains 3 Francis turbine-generators with 58.84 (67)[2] MW each in an underground powerhouse. The turbine rotation is 150 rpm. The minimum hydraulic head is 51 m, the maximum 66 m. Maximum flow per turbine is 128 m³/s.[3]

Miranda II

In 1995 an additional underground powerhouse was completed and a further Francis turbine with a 193 MW capacity went online. The turbine rotation is 100 rpm. The minimum hydraulic head is 40 m, the maximum 60 m. Maximum flow of the turbine is 386 m³/s.[3]

See also

References

  1. 1 2 3 4 5 "MIRANDA DAM". APA Barragens de Portugal. Retrieved 2015-02-05.
  2. 1 2 3 4 "Miranda Hydroelectric Power Plant Portugal". Global Energy Observatory. Retrieved 2015-02-05.
  3. 1 2 3 4 "Miranda Informação Técnica" (in Portuguese). Energias de Portugal. Retrieved 2015-02-05.
  4. 1 2 "DECLARAÇÃO AMBIENTAL 2012" (PDF) (in Portuguese). Energias de Portugal. pp. 29–30 (27–28). Retrieved 2015-02-05.
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