FREIGIL DAM

PURPOSE - Hydroelectric
LOCATION GENERAL FEATURES
Distritct - Viseu
Municipality - Cinf„es
Site - Fojo
River basin - Douro
River - Cabrum river
Promoting entity - HDN, Energia do Norte, SA
Owner (RSB) - HDN
Engineering by - EDP - DOEH
Construction by - ENSUL
Project year - 1925
Year of completion - 1955
HYDROLOGY  RESERVOIR
River basin area - 54 km2
Mean annual rainfall - 2267 mm
Flood runoff - 400 m3/s
Return period - 1000 years
Reservoir area - 33 x 1000m2
Gross capacity - 140 x 1000m3
Effective storage - 138 x 1000m3
Normal water level (NWL) - 317 m
DAM FEATURES
Concrete - Gravity dam
Height above foundation - 17 m
Crest elevation - 319,7 m
Crest length - 73 m
Crest width - 1,6 m
Foundation - Diorite
SPILLWAY BOTTOM OUTLET
Location - Dam body
Control type - Uncontrolled
Spillway type - Over dam body
Sill elevation - 317 m
Sill length - 54,8 m
Maximum discharge capacity - 400 m3/s
Energy dissipation - Hydraulic jump
Location - Thalweg
Type - Through the dam
Section - 0,8 x 0,8m
Upstream control  - Gate
POWER PLANT
Type - Reservoir - Outdoor
Number of installed units - 1
Type of units - Francis
Power installed capacity - 4,6 MW
Mean annual energy output - 10,3 GWh


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