December 2024 storage by river basin were lower than the December storage averages (1990/91 to 2023/24), except in the Cávado/Ribeiras Costeiras, Douro, Mondego, Ribeiras do Oeste and Guadiana basins.

At the end of December, the Barlavento basin continued to have the smallest amount of water, just 12.6% (12.6% at the end of November), when the average was 61.5%.

Of the 60 monitored reservoirs, 10 have water availability greater than 80% of the total volume and 12 have less than 40% of the total volume.

According to SNIRH data available today, at the end of December, the Barlavento (12.6%), Arade (29.7%), Mira (36.4%), and Sado (48.4%) basins had the lowest water availability.

The Guadiana and Mondego basins were those with the highest volume of water, with 76.6% and 73.8%, respectively, followed by Douro (71.9%), Cávado (69.4%), Tagus (66% ) and West (68.6%).

Each river basin may correspond to more than one reservoir.