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 |