The reservation by areas is as follows:
- Eastern Cantabrian is 91.8%
- Western Cantabrian 81.5%
- Miño-Sil 85.3%
- Galicia Costa at 87.7%
- Internal basins of the Basque Country at 90.5%
- Duero at 74.4%
- 54.8% cut
- Guadiana at 41.2%
- Red, Odiel and Piedras 78.6%
- 51.4% Guadalete-Barbate
- Guadalquivir at 47.7%
- 54.0% Andalusian Mediterranean Basin
- 39.3% safe
- Juice at 48.0%
- Ebro at 78.3%
- Inland basins of Catalonia at 92.8%
Precipitation has been abundant in the Atlantic slope and has significantly affected the Mediterranean slope. The maximum has been produced in Vigo with 90.1 mm (90.1 l / m²).
The situation of the basins, in cubic hectometers, is detailed in the attached table: