TORRÃO DAM

PURPOSE - Hydroelectric
LOCATION GENERAL FEATURES
District  - Porto
Municipality - Marco de Canavezes
Site - Torrão/Alpendurada
River Basin - Douro
River - Tâmega river
Promoting entity - CPPE, Cª. Portuguesa de Produção de Electricidade, SA
Owner - CPPE
Engineering by - EDP
Construction by - Mota & Companhia/Conduril
Project year - 1979
Year of completion - 1988
HYDROLOGY  RESERVOIR
River basin area - 3252,1 km2
Mean annual rainfall - 1273 mm
Mean annual runoff - 2 110 800 x 1000 m3
Flood runoff  - 4150 m3/s
Return period - 
500 years
Reservoir area   - 6 500 x 1 000 m2
Gross capacity - 124 000 x 1 000 m3
Effective storage- 77 000 x 1 000 m3
Dead storage - 47 000 x 1 000 m3
Normal water level (NWL) - 65 m
Maximum flood level (MFL) - 65 m
Minimum operating level  - 49 m
DAM
Concrete - Gravity dam, lightened by large hollows
Height above foundation - 69 m
Crest elevation - 69 m
Crest length - 218 m
Crest width - 8,35 m
Foundation - Granite
Volume of dam body
- 224,415 x 1 000 m3
SPILLWAY BOTTOM OUTLET
Location - Dam body
Control type - Controlled
Spillway type - Over the dam
Sill elevation - 54,4 m
Sill length -
53,50 m
Number of gates - 5
Maximum discharge -
4500 m3/s
Energy dissipation - Hydraulic jump
Location - Thalweg
Type - Through the dam
Section - 2x4,91=9,82m2
Maximum discharge  - 250 m3/s
Upstream control - No
Downstream control - Yes
POWER PLANT
Type - Underground
Number of installed units - 2
Type of units - Turbine/Pump
Power installed capacity - 146 MW
Mean annual energy output - 228 GWh


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