VALEIRA DAM

PURPOSE - Hydroelectric / Navigation
LOCATION GENERAL FEATURES
District- Viseu
Municipality - S. João da Pesqueira
Site - Valeira
River Basin - Douro
River - Douro river
Promoting entity - CPPE, Cª. Portuguesa de Produção de Electricidade, SA
Owner - CPPE
Engineering by - EDP
Construction by- Moniz da Maia, Serra & Fortunato
Project year- 1971
Year of completion - 1975
HYDROLOGY RESERVOIR
River basin area - 85 400 km2
Mean annual rainfall - 582 mm
Mean annual runoff - 4 755 600 x 1 000 m3
Flood runoff - 17 700 m3/s
Return period - 
1 000 years
Reservoir area   - 7 950 x 1 000m2
Gross capacity - 97 000 x 1 000m3
Effective storage - 8 000 x 1 000m3
Normal water level (NWL) - 105 m
DAM
Concrete - Gravity
Height above foundation - 48 m
Crest elevation - 113 m
Crest length - 380 m
Crest width - 6 m
Foundation - Schist
Volume of dam body
- 220 x 1 000 m3
SPILLWAY
Location - Dam body
Control type - Controlled
Spillway type - Central surface
Sill elevation - 90,1 m
Sill length -
5 x 26 + 4,2 = 34,2 m
Number of gates - 5 radial gates
Maximum discharge -
18 000 m3/s
Energy dissipation - Stilling basin
POWER PLANT
Type - Adjacent to the dam
Number of installed units - 3
Type of units - Kaplan
Power installed capacity - 216 MW
Mean annual energy output - 801 GWh


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