NUNES DAM

PURPOSE - Hydroelectric
LOCATION GENERAL FEATURES
District - Bragança
Municipality - Vinhais
Site - Vila Verde
River Basin - Douro
River - Tuela river
Promoting entity - Sociedade Produtora de Energia Mini-Hídrica, Lda
Owner - Soc. P. de Energia Mini-Hídrica
Year of completion - 1995
HYDROLOGY RESERVOIR
River basin area - 406 km2
Mean annual rainfall - 1291,1 mm
Flood runoff  - 1350 m3/s
Return period  -
1000 years
Gross capacity - 138 x 1000m3
Effective storage - 98 x 1000m3
Normal water level (NWL) - 535,5 m
Maximum flood level (MFL) - 541,3 m
Minimum operating level  - 532 m
DAM
Concrete - Cuvature gravity dam
Height above foundation - 21,5 m
Height above streambed - 18,5 m
Crest elevation - 542,3 m
Crest length - 65,5 m
SPILLWAY BOTTOM OUTLET
Location - Dam body
Control type - Uncontrolled
Spillway type - Over the dam
Sill elevation - 535,5 m
Sill length -
45 m
Maximum discharge -
1350 m3/s
Energy dissipation - Inexistent
Location - Right bank
Type - Through the dam
Section - 6 m2
Maximum discharge  - 52,36 m3/s
Upstream control  - Sluice gate
Downstream control  - Sluice gate
Energy dissipation - Inexistent
POWER PLANT
Type - Circuito hidráulico
Number of installed units - 2
Type of units - Francis turbines
Power installed capacity - 9,9 MW
Mean annual energy output - 41,56 GWh


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