Valeira Dam ( pt, Barragem da Valeira, links=no) is a

concrete Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most wi ...

gravity dam A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it. ...

on the

Douro The Douro (, , ; es, Duero ; la, Durius) is the highest-flow river of the Iberian Peninsula. It rises near Duruelo de la Sierra in Soria Province, central Spain, meanders south briefly then flows generally west through the north-west part of ...

, where the river forms the border line between the districts of

Viseu Viseu () is a city and municipality in the Centro Region of Portugal and the capital of the district of the same name, with a population of 100,000 inhabitants, and center of the Viseu Dão Lafões intermunipical community, with 267,633 inhabita ...

and Bragança. It is located in the municipality

São João da Pesqueira São João da Pesqueira () is a municipality and municipal seat in the Portuguese district of Viseu. The population of the municipality in 2011 was approximately 7,874 inhabitants, in an area that extends . The present mayor is Manuel Cordeiro, ele ...

, in Viseu District, Portugal. Construction of the dam began in 1971. The dam was completed in 1975. It is owned by ''Companhia Portuguesa de Produção de Electricidade'' (CPPE).

Dam

Valeira Dam is a 48 m tall (height above foundation) and 380 m long gravity dam with a crest altitude of 113 m. The volume of the dam is 220,000 m³. The

spillway A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure tha ...

with 5 radial gates is part of the dam body (maximum discharge 18,000 m³/s).

Reservoir

At full reservoir level of 105 m the reservoir of the dam has a surface area of 7.95 km² and a total capacity of 97 mio. m³. The active capacity is 8 (12, 13 or 13,04) mio. m³.

Power plant

Barragem da Valeira - Portugal (32351108773)

The

run-of-the-river Run-of-river hydroelectricity (ROR) or run-of-the-river hydroelectricity is a type of hydroelectric generation plant whereby little or no water storage is provided. Run-of-the-river power plants may have no water storage at all or a limited amou ...

hydroelectric Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and ...

power plant was commissioned in 1976 (1975). It is operated by EDP. The plant has a

nameplate capacity Nameplate capacity, also known as the rated capacity, nominal capacity, installed capacity, or maximum effect, is the intended full-load sustained output of a facility such as a power station,

of 240 (216) MW. Its average annual generation is 610.7 (663, 748 or 801)

GWh A kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules (MJ). Kilowatt-hours are a common bil ...

. The power station contains 3

Kaplan turbine The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, who combined automatically adjusted propeller blades with automatically adjusted wicket gates to ach ...

-generators with 82.4 (72) MW (80 MVA) each in a dam powerhouse located on the right side of the dam. The turbine rotation is 115.4 rpm. The minimum

hydraulic head Hydraulic head or piezometric head is a specific measurement of liquid pressure above a vertical datum., 410 pages. See pp. 43–44., 650 pages. See p. 22. It is usually measured as a liquid surface elevation, expressed in units of length, ...

is 15.5 m, the maximum 31.5 m. Maximum flow per turbine is 360 m³/s. The turbines were provided by

Kværner Kværner was a Norwegian engineering and construction services company that existed between 1853 and 2005. In 2004, it was amalgamated to the newly formed subsidiary of Aker ASA - Aker Kværner, which was renamed Aker Solutions on 3 April 2008 ...

, the generators by

Brown, Boveri & Cie Brown, Boveri & Cie. (Brown, Boveri & Company; BBC) was a Swiss group of electrical engineering companies. It was founded in Zürich, in 1891 by Charles Eugene Lancelot Brown and Walter Boveri who worked at the Maschinenfabrik Oerlikon. In 1 ...

Lock

On the left side of the dam is a

lock Lock(s) may refer to: Common meanings *Lock and key, a mechanical device used to secure items of importance *Lock (water navigation), a device for boats to transit between different levels of water, as in a canal Arts and entertainment * ''Lock ...

, which can handle ships with the following maximum properties: 83 m in length, 11.40 m on the beam, 3.8 m load-draught and a cargo capacity of 2500 tons.

References

{{DEFAULTSORT:Valeira Dam Dams in Portugal Hydroelectric power stations in Portugal Gravity dams Dams completed in 1975 Energy infrastructure completed in 1975 1975 establishments in Portugal Buildings and structures in Viseu District Dams on the Douro River Locks of Portugal Run-of-the-river power stations

Dam

Reservoir

Power plant

Lock

See also

References