ENXOÉ DAM

PURPOSE - Water supply
LOCATION GENERAL FEATURES
District - Beja
Site - Serpa
River Basin - Guadiana
River - Enxoé river
Promoting entity - Instituto da Água
Owner (RSB) - C M Serpa e C M Mértola
Engineering by - Hidrotécnica Portuguesa
Construction by - EDIFER
Project year - 1995
Year of completion - 1998
HYDROLOGY RESERVOIR
River basin area - 60,8 km2
Mean annual rainfall - 602 mm
Mean annual runoff - 8630 x 1000 m3
Flood runoff - 180 m3/s
Return period - 500 years
Reservoir area - 2050 x 1000m2
Gross capacity - 10400 x 1000m3
Effective storage - 9500 x 1000m3
Dead storage - 900 x 1000m3
Normal water level (NWL) - 175 m
Maximum flood level (MFL) - 177,1 m
Minimum operating level - 160,75 m
DAM
Earthfill - Zoned embankment
Height above foundation - 23 m
Height above streambed - 20,5 m
Crest elevation - 179 m
Crest length - 415 m
Crest width - 4 m
Volume of dam body - 240 x 1000 m3
SPILLWAY BOTTOM OUTLET
Location - Right bank
Control type - Uncontrolled
Spillway type - Chute spillway
Sill elevation - 175 m
Sill length - 5 m
Maximum discharge - 33,4 m3/s
Energy dissipation - Steps
Location - Left bank
Type - Rock tunnel
Maximum discharge - 5,3 m3/s
Upstream control - Fixed roller gate
Downstream control - Hollow jet valve
Energy dissipation - Hollow jet and scour holes


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