VILAR DAM

PURPOSE - Hydroelectric / Diversion
LOCATION GENERAL FEATURES
District - Viseu
Municipality - Tabuaço
Site - Vilar
River Basin - Douro
River - Távora river
Promoting entity  - CPPE, Cª. Portuguesa de Produção de Electricidade, SA
Owner (RSB) - CPPE
Engineering by - Hidro Eléctrica do Douro
Construction by - Luso - Dana, Ldª.
Project year - 1958
Year of completion - 1965
HYDROLOGY RESERVOIR
River basin area - 360 km2
Mean annual rainfall - 929,6 mm
Mean annual runoff - 305 800 x 1 000 m3
Flood runoff  - 500 m3/s
Return period - 
1 000 years
Reservoir area - 6 700 x 1 000 m2
Gross capacity - 99 750 x 1 000 m3
Effective storage - 95 270 x 1 000 m3
Normal water level (NWL) - 552 m
DAM
Rockfill - With upstream facing
Height above foundation -
 58 m
Height above streambed - 55 m
Crest elevation - 555 m
Crest length - 240 m
Crest width - 5,2 m
Foundation - Schist and granite
Volume of dam body
300 x 1 000 m3
SPILLWAY BOTTOM OUTLET
Location - Right bank
Control type - Controlled
Spillway type- Chute spillway
Sill length - 12,40 m
Number of gates - 2 radial gates
Maximum discharge -
500 m3/s
Location - Thalweg
Type - Rock tunnel
Section - 2,14m2
Maximum discharge -  m3/s
Upstream control - N0
Downstream control - Hollow jet valve
Energy dissipation - Hollow jet and scour holes
POWER PLANT
Type - Underground
Number of installed units - 2
Type of units - Pelton
Power installed capacity - 64 MW
Mean annual energy output - 148 GWh


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