MAIROS DAM

PURPOSE - Irrigation
LOCATION GENERAL FEATURES
District - Vila Real
Municipality - Chaves
Site - Mairos
River Basin - Douro
River - Aveleiras river
Promoting entity - Direcção Regional de Agricultura de Trás-os-Montes
Owner - Junta de Agricultores de Mairos
Engineering by - Consórcio Hidroprojecto / AGRAR
Construction by - CONDURIL
Project year - 1988
Year of completion - 1995
HYDROLOGY RESERVOIR
River basin area - 2,21 km2
Flood runoff  - 10,3 m3/s
Return period - 500 years
Reservoir area   - 67 x 1000m2
Gross capacity - 369 x 1000m3
Effective storage - 359,7 x 1000m3
Dead storage  - 9,3 x 1000m3
Normal water level (NWL) - 800 m
Maximum flood level (MFL) - 801,46 m
Minimum operating level  - 778,3 m
DAM
Earthfill - Zoned embankment
Height above foundation - 23,5 m
Height above streambed- 20,5 m
Crest elevation - 801,5 m
Crest length - 213,5 m
Volume of dam body
- 78 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Left bank
Control type - Uncontrolled
Spillway type - Chute spillway
Sill elevation - 800 m
Sill length - 10 m
Maximum discharge - 7 m3/s
Energy dissipation - Flip bucket
Location - Right bank
Type - Conduit under the embankment
Section - d 500 mm
Maximum discharge - 1,5 m3/s


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