VAROSA DAM

PURPOSE - Hydroelectric
LOCATION GENERAL FEATURES
District - Viseu
Municipality - Lamego
Site - Almacave
River Basin - Douro
River - Varosa river
Promoting entity - HDN, Energia do Norte, SA
Owner - HDN
Engineering by - J.P. STUCKY
Construction by - SOMAGOPE
Year of completion - 1976
HYDROLOGY RESERVOIR
Mean annual rainfall - 1 500 mm
Mean annual runoff - 345 120 x 1 000 m3
Flood runoff - 1 200 m3/s
Return period - 
1 000 years
Reservoir area - 700 x 1 000 m2
Gross capacity - 12 943 x 1 000 m3
Effective storage - 12 937 x 1 000m3
Normal water level (NWL) - 264 m
Maximum flood level (MFL) - 265 m
DAM
Concrete - Arch dam
Height above streambed - 76 m
Crest elevation - 265 m
Crest length - 213 m
Crest width - 3,44 m
Foundation - Granite
Volume of dam body
- 81 x 1 000 m3
SPILLWAY BOTTOM OUTLET
Location  - Right bank
Control type - Controlled
Spillway type - Chute spillway
Sill elevation - 253 m
Sill length -
17,25 m
Number of gates - 3 radial gates
Maximum discharge -
1200 m3/s
Energy dissipation - Flip bucket
Location - Thalweg
Type - Through the dam
Section - 0,90 x 1,20m
Upstream control  - Yes
Downstream control - Yes
POWER PLANT
Type - Outdoor reservoir
Number of installed units - 3
Type of units - Francis
Power installed capacity - 24,7 MW
Mean annual energy output - 60 GWh


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