Belver Dam

Belver Dam (Portuguese: Barragem de Belver) is a concrete gravity dam on the Tagus, where the river forms the border line between the Portuguese districts of Portalegre and Santarém. It is located in the municipality Gavião, in Portalegre District.

Belver Dam
Location of Belver Dam in Portugal
Official nameBarragem de Belver
Locationmunicipality Gavião, Portalegre District, Portugal
Coordinates39°28′47.2″N 7°59′52.3″W
PurposePower
StatusOperational
Construction began1945
Opening date1952
Owner(s)HIDROTEJO
Operator(s)Energias de Portugal
Dam and spillways
Type of damConcrete gravity dam
ImpoundsTagus
Height (foundation)30 m (98 ft)
Length327.5 m (1,074 ft)
Elevation at crest47.5 m (156 ft)
Dam volume90,000 m3 (3,200,000 cu ft)
Spillway typeDam body
Spillway capacity18,000 m3 (640,000 cu ft)
Reservoir
Total capacity12,500,000 m3 (10,100 acre⋅ft)
Active capacity8,500,000 m3 (6,900 acre⋅ft)
Surface area2.86 km2 (1.10 sq mi)
Normal elevation46.15 m (151.4 ft)
Operator(s)Energias de Portugal
Commission date1951
Hydraulic head15.2 m (50 ft) (max)
TurbinesKaplan-type:
4 x 8.091 MW,
1 x 15.997 MW,
1 x 35.304 MW
Installed capacity80.7 MW
Annual generation220 GWh

Construction of the dam began in 1945. The dam was completed in 1952. It is owned by HIDROTEJO.[1]

Dam

Belver Dam is a 30-metre-tall (98 ft) (height above foundation) and 327.5-metre-long (1,074 ft) gravity dam with a crest altitude of 47.5 metres (156 ft). The volume of the dam is 90,000 m³. The spillway is part of the dam body (10 roller gates with a maximum discharge capacity of 18,000 m³/s).[1]

Reservoir

At full reservoir level of 46.15 metres (151.4 ft) (maximum flood level of 47.15 metres (154.7 ft)) the reservoir of the dam has a surface area of 2.86 km² and its total capacity is 12.5 mio. m³. The active capacity is 8.5 (7.5)[2] mio. m³. Minimum operating level is 41 metres (135 ft).[1]

Power plant

The run-of-the-river hydroelectric power plant went operational in 1951.[2] It is operated by EDP. The plant has a nameplate capacity of 80.7[1][2][3] (80)[4] MW. Its average annual generation is 220[2] (176,[1] 180[3] or 239[4]) GWh.

The power station contains six Kaplan turbine-generators in a dam powerhouse. The machines 1 to 5 have vertical shafts, whereas machine 6 has a horizontal shaft. The maximum hydraulic head is 15.2 metres (50 ft).[2]

Machine Commission date[3] Turbine (MW) Generator (MVA) Rotation
1 1951 8.091 11 167
2 1951 8.091 11 167
3 1951 8.091 11 167
4 1951 8.091 11 167
5 1971 15.997 20 125
6 1984 35.304 31 100
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See also

References
  1. "BELVER DAM". APA Barragens de Portugal. Retrieved 2015-02-22.
  2. "Belver Informação Técnica" (in Portuguese). Energias de Portugal. Archived from the original on 2017-08-15. Retrieved 2015-02-22.
  3. "DECLARAÇÃO AMBIENTAL 2012" (PDF) (in Portuguese). Energias de Portugal. pp. 51 (49). Archived from the original (PDF) on 2014-11-03. Retrieved 2015-02-07.
  4. "Hidroelectricidade em Portugal memória e desafio" (PDF) (in Portuguese). Rede Eléctrica Nacional, S.A. p. 29 (27). Retrieved 2015-02-05.
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