MAGOS DAM

PURPOSE - Irrigation
LOCATION GENERAL FEATURES
District - Santarém
Municipality - Salvaterra de Magos
Site - Janho Novo
River Basin - Tejo
River - Magos river
Promoting entity - INAG
Owner - Associação de Regantes e Beneficiários do Vale do Sorraia
Engineering by - JAOHA
Construction by - JAOHA
Project year - 1933
Year of completion - 1938
HYDROLOGY RESERVOIR
River basin area - 104,8 km2
Mean annual rainfall - 500 mm
Mean annual runoff - 5100 x 1000 m3
Flood runoff  - 110 m3/s
Reservoir area - 900 x 1000m2
Gross capacity - 3384 x 1000m3
Effective storage - 3000 x 1000m3
Dead storage  - 384 x 1000m3
Normal water level (NWL) - 19,02 m
Maximum flood level (MFL) - 21,5 m
Minimum operating level  - 8,2 m
DAM
Earthfill - Homogeneous embankment
Height above foundation - 17 m
Height above streambed - 15 m
Crest elevation - 23 m
Crest length - 400 m
Crest width - 5 m
Foundation - Clay, sand and gravel
Volume of dam body
- 73 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Left bank
Control type - Controlled
Spillway type - Chute spillway
Sill elevation - 16,18 m
Sill length - 17,9 m
Number of gates - 9 wooden sluice gates
Maximum discharge - 110 m3/s
Energy dissipation - Inexistent
Location - Thalweg
Type - Conduit under the embankment
Section - d 1,0 m
Maximum discharge  - 1 m3/s
Upstream control  - 2 sluice gates
Energy dissipation - Inexistent


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