PEGO DO ALTAR DAM

PURPOSE - Irrigation / Hydroelectric
LOCATION GENERAL FEATURES
District  - Setúbal
Municipality - Alcácer do Sal
Site - Pego do Altar / Santa Susana
River Basin - Sado
River - Alcáçovas river
Promoting entity - Associação de Benef. do Vale do Sado
Owner - Ass. Benef. do Vale do Sado
Engineering by - JAOHA
Construction by - R. Rosa, SPEL, Bastien & Costa, SETH, JAOHA
Project year - 1934
Year of completion - 1949
HYDROLOGY RESERVOIR
River basin area - 743 km2
Mean annual rainfall - 550 mm
Reservoir area- 6 550 x 1 000m2
Gross capacity - 94 000 x 1 000m3
Effective storage - 93 600 x 1 000m3
Dead storage - 400 x 1 000m3
Normal water level (NWL) - 52,26 m
Maximum flood level (MFL) - 52,26 m
Minimum operating level  - 15 m
DAM
Rockfill - With upstream facing
Height above foundation - 43,5 m
Height above streambed - 63 m
Crest elevation - 56 m
Crest length - 192 m
Crest width - 5 m
Foundation -
Clayey schist
Volume of dam body
- 371 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location  - Right bank
Control type - Controlled
Spillway type - Shaft spillway
Sill elevation - 47,56 m
Sill length -
4 x 21,25 m
Number of gates - 4 radial gates
Maximum discharge -
1 200 m3/s
Energy dissipation - Inexistent
Location - Right bank
Type - Rock tunnel
Section - 2 x 1,2 x 1,5 m2
Maximum discharge - 80 m3/s
Upstream control - 2 sluice gates
Downstream control - 2 sluice gates
Energy dissipation - Inexistent
POWER PLANT
Type - Dam toe
Mean annual energy output - 5,2 GWh


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