Crestuma–Lever Dam

Crestuma–Lever Dam (Portuguese: Barragem de Crestuma-Lever) is a concrete gravity dam on the Douro. It is located in the municipality Vila Nova de Gaia, in Porto District, Portugal.

Crestuma–Lever Dam
Upstream face of the dam and retained lake
Location of Crestuma–Lever Dam in Portugal
Official nameBarragem de Crestuma-Lever
CountryPortugal
Locationmunicipality Vila Nova de Gaia, Porto District
Coordinates41°4′21.9″N 8°29′10.8″W
PurposePower
StatusOperational
Construction began1976
Opening date1985
Owner(s)Companhia Portuguesa de Produção de Electricidade
Operator(s)Energias de Portugal
Dam and spillways
Type of damConcrete gravity dam
ImpoundsDouro
Height (foundation)25.5 m (84 ft)
Length470 m (1,540 ft)
Elevation at crest25.5 m (84 ft)
Width (crest)8.2 m (27 ft)
Dam volume205,000 m3 (7,200,000 cu ft)
Spillway typeDam body
Spillway capacity26,000 m3/s (920,000 cu ft/s)
Reservoir
Total capacity110,000,000 m3 (89,000 acre⋅ft)
Active capacity22,500,000 m3 (18,200 acre⋅ft)
Surface area12.98 km2 (5.01 sq mi)
Normal elevation13 m (43 ft)
Operator(s)Energias de Portugal
Commission date1985
Hydraulic head12.6 m (41 ft) (max)
Turbines3 x 39 MW Kaplan-type
Installed capacity117 MW
Annual generation360 GWh

Construction of the dam began in 1976. The dam was completed in 1985. It is owned by Companhia Portuguesa de Produção de Electricidade (CPPE).[1]

Dam

Crestuma–Lever Dam is a 25.5[2][3][4] m tall (height above foundation) and 470 m long gravity dam with a crest altitude of 25.5 m. The volume of the dam is 205,000 m³. The spillway with 8 gates is part of the dam body (maximum discharge 26,000 m³/s).[1]

Reservoir

At full reservoir level of 13 m (maximum flood level of 21.5 m) the reservoir of the dam has a surface area of 12.98 km² and a total capacity of 110 mio. m³.[1] The active capacity is 22.5[1][2] (16[4] or 19[5]) mio. m³.

Panoramic view of the dam from a boat on its lake

Power plant

The run-of-the-river hydroelectric power plant was commissioned in 1985[2][5][6] (1986).[3][4] It is operated by EDP. The plant has a nameplate capacity of 117[2][3] (105[4][5] or 108[1][6]) MW. Its average annual generation is 360[2] (311,[3] 363,[5] 366.9,[1][6] or 399[4]) GWh.

The power station contains 3 Kaplan turbine-generators (horizontal axis) with 39 (36[6]) MW (36.1 MVA) each in a dam powerhouse located on the left side of the dam. The turbine rotation is 83.3 rpm. The minimum hydraulic head is 6.8 m, the maximum 12.6 m. Maximum flow per turbine is 450 m³/s.[2]

The turbines and generators were provided by Sorefame.[6]

Lock

On the left side of the dam is a 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.[7]

See also

References
  1. "Crestuma–Lever Dam". APA Barragens de Portugal. Retrieved 2015-03-11.
  2. "Crestuma-Lever Informação Técnica" (in Portuguese). Energias de Portugal. Archived from the original on 2017-08-13. Retrieved 2015-03-11.
  3. "Declaração Ambiental 2012" (PDF) (in Portuguese). Energias de Portugal. pp. 36–37 (34–35). Archived from the original (PDF) on 2014-11-03. Retrieved 2015-03-11.
  4. "Central de Crestuma–Lever" (in Portuguese). www.wikienergia.pt. Archived from the original on 2014-11-01. Retrieved 2015-03-11.
  5. "Hidroelectricidade em Portugal memória e desafio" (PDF) (in Portuguese). Rede Eléctrica Nacional, S.A. p. 29 (27). Retrieved 2015-03-09.
  6. "Crestuma–Lever Hydroelectric Power Plant Portugal". Global Energy Observatory. Retrieved 2015-03-11.
  7. "waterway introduction". Instituto Portuário e dos Transportes Marítimos. Retrieved 2015-02-11.
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