VALE DO GAIO DAM

PURPOSE - Irrigation / Hydroelectric
LOCATION GENERAL FEATURES
District - Setúbal
Municipality - Alcácer do Sal
Site - Vale do Gaio
River Basin - Sado
River - Xarrama river
Promoting entity - INAG
Owner - Assoc. de Benef. do Vale do Sado
Engineering by - JAOHA
Construction by - SETH e JAOHA
Project year - 1936
Year of completion - 1949
HYDROLOGY RESERVOIR
River basin area - 509 km2
Mean annual rainfal- 558 mm
Mean annual runoff - 59 644 x 1 000 m3
Reservoir area - 5 500 x 1 000 m2
Gross capacity - 63 000 x 1 000 m3
Effective storage - 55 000 x 1 000 m3
Normal water level (NWL) - 40,5 m
Maximum flood level (MFL) - 42,5 m
Minimum operating level - 11 m
DAM
Earthfill and Rockfill
Height above foundation -
 51 m
Height above streambed - 34 m
Crest elevation - 44,5 m
Crest length - 368 m
Crest width - 6 m
Foundation - Schist, conglomerate and sandstone
Volume of dam body
636 x 1 000 m3
SPILLWAY BOTTOM OUTLET
Location  - Saddle at left embankment
Control type - Control misto
Spillway type - Shaft spillway
Sill elevation - 40,5 m
Sill length -
2 x 80 + 20 m
Number of gates - 1 radial gate
Maximum discharge -
1000 m3/s
Energy dissipation - Hydraulic jump
Location - Right bank
Type - Rock tunnel
Section - 2 x 1,2x1,5 m2
Maximum discharge  - 70 m3/s
Upstream control - 2 sluice gates
Downstream control  - 2 csluice gates
Energy dissipation - Inexistent
POWER PLANT
Type  - Contiguous to the dam
Mean annual energy output - 2,6 GWh


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