According to data from the National Water Resources Information System (SNIRH), the amount of water retained by the Mira basin rose to 58.8% (57.9 at the end of March), that of the Barlavento to 60.9% (57.5) and that of the Arade to 87.4% (82.1).

According to the report, the amount of stored water increased in 11 river basins and fell in one, the Tejo, from 97.3% to 96.1%.

Storages by river basin were higher than the April averages (1990/91 to 2023/24), except in the Mira and Ribeiras do Algarve basins.

Of the 60 monitored reservoirs, 51 have water availability greater than 80% of the total volume and one has availability less than 40% of the total volume.

The Mondego and Guadiana basins were those that presented the highest volume of water with 99.5% and 97.4%, respectively, followed by Oeste (96.6%), Tejo (96.1%), Lima (93.3%), Ave (91.3%), Douro (91%), Cávado (90.4%), Arade (87.4%) and Sado (84.1%).

Each hydrographic basin may correspond to more than one reservoir.