BEMPOSTA DAM

PURPOSE - Hydroelectric
LOCATION GENERAL FEATURES
District - Bragança
Municipality - Mogadouro
Site - Gardal do Douro
River Basin - Douro
River - Douro river
Promoting entity - CPPE, Cª. Portuguesa de Produção de Electricidade, SA
Owner (RSB) - CPPE
Engineering by - Hidro Eléctrica do Douro
Construction by - MAGOP
Project year - 1957
Year of completion - 1964
HYDROLOGY RESERVOIR
River basin area - 63850 km2
Mean annual rainfall - 582 mm
Mean annual runoff - 3339700 x 1000 m3
Flood runoff - 11000 m3/s
Return period - 1000 years
Reservoir area - 4050 x 1000m2
Gross capacity - 129000x 1000m3
Effective storage - 20000 x 1000m3
Normal water level (NWL) - 402 m
DAM SPILLWAY
Concrete - Arch gravity
Height above foundation - 87 m
Crest elevation - 408 m
Crest length - 297 m
Crest width - 3,5 m
Foundation - Granite
Volume of dam body - 316 x 1000 m3
Location - In the dam body
Control type -
Controlled
Spillway type -
Over the dam
Sill elevation -
392,5 m
Sill length - 4x24+1x10=106 m
Number of gates - 4 radial gates
Maximum discharge - 11500 m3/s
Energy dissipation - Hydraulic jump
BOTTOM OUTLET POWER PLANT
Location - Right bank
Type - Rock tunnel
Section -
4,52x2,0m=9,04m2
Maximum discharge -
200 m3/s
Upstream control - No
Downstream control - Yes
Type - Underground
Number of installed units - 3
Type of units - Francis
Power installed capacity - 210 MW
Mean annual energy output - 1086 GWh


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