ANDORINHAS DAM (Travassos)

PURPOSE - Hydrolectric
LOCATION GENERAL FEATURES
District - Braga
Municipality - Póvoa de Lanhoso
Site - Andorinhas
River Basin - Ave
River - Ave river
Promoting entity - HDN, Energia do Norte
Owner  (RSB) - HDN
Engineering by - A. Stucky
Construction by - Joaquim Moreira Ramalhão
Project year - 1941
Year of completion - 1945
HYDROLOGY RESERVOIR
Mean annual rainfall - 2280 mm
Mean annual runoff - 217900 x 1000 m3
Flood runoff - 450 m3/s
Return period - 1000 years
Reservoir area - 210 x 1000m2
Gross capacity - 1200 x 1000m3
Normal water level (NWL) - 185,7 m
Maximum flood level (MFL) - 189,1 m
DAM
Concrete - Gravity dam
Height above foundation - 25 m
Crest elevation - 191,2 m
Crest length - 103,5 m
Crest width - 1,8 m
Foundation - Granite
Volume of dam body - 12 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Dam body
Control type - Uncontrolled
Spillway type - Over the dam
Sill elevation - 
Sill length - 33 m
Maximum discharge - 450 m3/s
Energy dissipation - Stilling basin
Location - Thalweg
Type - Through the dam
Section - d 1,60m
Upstream control - Gate
Downstream control - Hollow jet
Energy dissipation - Stilling basin
POWER PLANT
Type - Outdoor power station
Number of installed units - 2
Type of units - Francis
Power installed capacity - 8,8 MW
Mean annual energy output - 19 GWh


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