RANHADOS DAM

PURPOSE - Water supply
LOCATION GENERAL FEATURES
District - Guarda
Municipality - Meda
Site - Ranhados
River Basin - Douro
River - Torto river
Promoting entity - Instituto da Água
Owner - Associação de Municípios do Rio Torto
Engineering by - DGRAH e CESL
Construction by - CONDURIL
Project year - 1982
Year of completion - 1986
HYDROLOGY RESERVOIR
River basin area - 47,3 km2
Mean annual rainfall - 802 mm
Mean annual runoff - 13 600 x 1 000 m3
Flood runoff  -  265 m3/s
Return period - 
500 years
Reservoir area   - 178 x 1 000m2
Gross capacity - 2 570 x 1 000m3
Effective storage - 1 790 x 1 000m3
Dead storage - 780 x 1 000m3
Normal water level (NWL) -  716 m
Maximum flood level (MFL) - 717,4 m
Minimum operating level  - 701,3 m
DAM
Concrete - Gravity
Height above foundation - 41,4 m
Height above streambed - 38,4 m
Crest elevation -
719 m
Crest length -  292 m
Crest width - 3 m
Foundation -
Granite
Volume of dam body
- 72 x 1 000 m3
SPILLWAY BOTTOM OUTLET
Location - Center
Control type - Uncontrolled
Spillway type - Over the dam
Sill elevation - 716 m
Sill length -
58,4 m
Maximum discharge - 215 m3/s
Energy dissipation - Hydraulic jump
Location - Right bank
Type - Through the dam
Section - D 500mm
Maximum discharge  - 2,6 m3/s
Upstream control  - Gate 0,80 x 0,80
Downstream control  - Hollow jet valve
Energy dissipation - Hollow jet and scour holes


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