Since it nearly does not rain in the Algarve in summer, storage reservoirs have been built in the mountains to guarantee the water supply all over the year.
Barragem do Arade
Coordinates: 37° 14′ 22″ N,8° 22′ 32″ W
Year of construction: 1944 until 1956
Surface: 1,82 km²
Content: 28,39 Mio. m³
Retaining wall: 246 m
Barragem do Funcho
Coordinates: 37° 15′ 44″ N,8° 22′ 58″ W
Year of construction: 1978 until 1993
Surface: 3,6 km²
Content: 42,75 Mio. m³
Retaining wall: 165 m