MONTARGIL DAM

PURPOSE - Irrigation / Hydroelectric
LOCATION GENERAL FEATURES
District - Portalegre
Municipality - Ponte de Sôr
Site - Montargil
River Basin - Tejo
River - Sôr river
Promoting entity - IHERA
Owner - Associação de Regantes e Beneficiários do Vale do Sorraia
Engineering by - DGSH
Construction by - Ângelo C. Ramalheira
Project year - 1954
Year of completion - 1958
HYDROLOGY RESERVOIR
River basin area - 1186 km2
Mean annual rainfall - 825 mm
Mean annual runoff - 15500 x 1000 m3
Flood runoff  - 1200 m3/s
Return period  -
500 years
Reservoir area - 16460  x 1000m2
Gross capacity - 164300 x 1000m3
Effective storage - 142700 x 1000m3
Dead storage  - 21600 x 1000m3
Normal water level (NWL) - 80 m
Maximum flood level (MFL) - 80,75 m
Minimum operating level - 65 m
DAM
Earthfill - Zoned embankment
Height above foundation - 48 m
Height above streambed - 36 m
Cota do coroamento - 83m
Crest elevation - 427 m
Crest width - 12 m
Foundation - Gabbro and diorite
Volume of dam body - 858 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Left bank
Control type - Controlled
Spillway type - Shaft spillway
Sill elevation - 77 m
Sill length -
4 x 11,5 m
Number of gates - 4 sector gates
Maximum discharge -
765 m3/s
Energy dissipation - Hydraulic jump
Location - Left bank
Type - Rock tunnel
Section - d 1,5 m
Maximum discharge - 36 m3/s
Upstream control - Sluice gate
Downstream control - Sluice gate
Energy dissipation - Hydraulic jump
POWER PLANT
Type - Contiguous to dam
Nº de grupos instalados - 1
Type of units - Francis turbine
Mean annual energy output - 5,9 GWh


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