CRESTUMA - LEVER DAM

PURPOSE - Hydroelectric / Water supply / Navigation
LOCATION GENERAL FEATURES
District - Porto
Municipality - Porto
Site - Crestuma
River Basin - Douro
River - Douro river
Promoting entity - CPPE, Cª. Portuguesa de Produção de Electricidade, SA
Owner (RSB) - CPPE
Engineering by - EDP
Construction by - Construtora do Tâmega, Ldª.
Project year - 1976
Year of completion - 1985
HYDROLOGY RESERVOIR
River basin area - 92040 km2
Mean annual rainfall - 1078 mm
Mean annual runoff - 7388900 x 1000 m3
Flood runoff - 26000 m3/s
Return period - 1000 years
Reservoir area - 12980 x 1000m2
Gross capacity - 110000 x 1000m3
Effective storage - 22500 x 1000m3
Normal water level (NWL) - 13 m
Maximum flood level (MFL) - 21,5 m
DAM
Concrete - Gravity
Height above foundation - 65 m
Crest elevation - 25,5 m
Crest length - 470 m
Crest width - 8,2 m
Foundation - Schist
Volume of dam body - 205 x 1000 m3
SPILLWAY
Location - IDam body
Spillway type - Over the dam
Sill length - 241,6 m
Number of gates - 8
Maximum discharge - 26000 m3/s
Energy dissipation - Stilling basin
POWER PLANT
Type -  Contiguous to dam
Number of installed units - 3
Type of units - Kaplan
Power installed capacity - 108 MW
Mean annual energy output - 366,9 GWh


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