VENDA VELHA DAM

PURPOSE - Irrigation / Flood control
LOCATION GENERAL FEATURES
District  - Setúbal
Municipality - Montijo
Site - Rio Frio
River Basin - Tejo
River - Asseiceira river
Promoting entity - Sociedade Agrícola de Rio Frio
Owner (RSB) - Sociedade Agrícola de Rio Frio
Engineering by - Engº José Lupi; HP
Project year - 1957
Year of completion - 1957
HYDROLOGY CARACTERÍSTICAS DA ALBUFEIRA
River basin area - 174 km2
Mean annual rainfall- 600 mm
Mean annual runoff- 17 400 x 1 000 m3
Flood runoff  - 300 m3/s
Return period - 
100 years
Reservoir area - 1 150 x 1 000 m2
Gross capacity - 4 700 x 1 000 m3
Effective storage - 60 x 1 000 m3
Normal water level (NWL) - 14,55 m
Maximum flood level (MFL) - 16,35 m
Minimum operating level  - 5,55 m
DAM
Earthfill - Homogeneous embankment
Height above foundation -
  m
Height above streambed - 12,5 m
Crest elevation - 18,55 m
Crest length - 550 m
Crest width - 4 m
Foundation -
Alluvia and clay
Volume of dam body
78 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Saddle at left embankment
Control type - Uncontrolled
Spillway type - Chute spillway
Sill elevation - 14,55 m
Sill length -
110 m
Maximum discharge - 139 m3/s
Energy dissipation - Hydraulic jump
Location - Thalweg
Type - Conduit under the embankment
Section - Oval
Maximum discharge - 12 m3/s
Upstream control - Sluice gate
Energy dissipation - Inexistent


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