Of the 59 reservoirs monitored, 26 showed water availability of less than 40 percent of the total volume and four more than 80 percent.
The Sado basin (28.1 percent) was the one with the lowest water availability at the end of September, followed by the Barlavento (34.4 percent), Ave (40.5 percent), Arade (41.8 percent), Oeste (41.9 percent), Mira (47.9), Lima (52.5 percent) and Tejo (58.8 percent).


The Cávado (64.3), Douro (62.8 percent), Mondego (62.7 percent) and Guadiana (62.5 percent) basins had the highest levels of storage at the end of September.


The reservoirs with lower water availability were located in the Guadiana and Sado basins in September.


In the Guadiana basin, the Lucefit reservoir (Alandroal, Évora district) had 4.8 percent water availability in September and Abrilongo (Campo Maior municipality, Portalegre district) with 5.6 percent.


In Sado, the Campilhas reservoir (municipality of Santiago do Cacém, in Setúbal) was in September with 7.2 percent of water availability and Monte da Rocha (municipality of Ourique, in Beja) with 8.8 percent.


Storages in September 2019 by river basin were below the average for September (1990/91 to 2017/18), except for the Cávado, Ribeiras Costeiras, Douro, Mondego and Arade basins.


Each river basin may correspond to more than one reservoir.