MONTE DA ROCHA DAM

PURPOSE - Irrigation / Water supply
LOCATION GENERAL FEATURES
District - Beja
Municipality - Ourique
Site - Panóias
River Basin - Sado
River - Sado river
Promoting entity - Associação de Regantes e Beneficiários de Campilhas e Alto Sado
Owner - Associação de Regantes e Beneficiários de Campilhas e Alto Sado
Engineering by - DGSH
Construction by - A. Supico
Project year - 1965
Year of completion - 1972
HYDROLOGY RESERVOIR
River basin area - 246 km2
Mean annual rainfall - 599 mm
Flood runoff  - 1500 m3/s
Return period  -
1000 years
Reservoir area   - 11000 x 1000m2
Gross capacity - 104500 x 1000m3
Effective storage - 99500x 1000m3
Dead storage  - 5000x 1000m3
Normal water level (NWL) - 137 m
Maximum flood level (MFL) - 138,45 m
Minimum operating level  - 113,5 m
DAM
Earthfill - Zoned embankment
Height above foundation - 55 m
Height above streambed - 51 m
Crest elevation - 141,4 m
Crest length - 2000 m
Crest width - 10m
Foundation - Schist and greywacke
Volume of dam body
- 1810 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Right bank
Control type - Uncontrolled
Spillway type - Shaft spillway
Sill elevation - 137 m
Sill length -
62,83 m
Maximum discharge - 260 m3/s
Energy dissipation - Hydraulic jump
Location - Right bank
Type - Rock tunnel
Section - 2 x d 1200 mm
Maximum discharge - 80 m3/s
Upstream control - 2 fixed roller gate
Downstream control - 2 fixed roller gate
Energy dissipation - Hydraulic jump


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