The reservation by areas is as follows:
- Cantabrian Oriental is 89.0%
- Western Cantabrian 92.1%
- Miño-Sil at 90.2%
- Galicia Costa 92.7%
- Internal basins of the Basque Country at 95.2%
- Duero at 72.6%
- 45.6% cut
- Guadiana at 40.1%
- Red, Odiel and Stones 75.5%
- 48.6% Guadalete-Barbate
- Guadalquivir at 43.9%
- Andalusian Mediterranean Basin at 49.0%
- Safe at 33.5%
- Juice at 38.7%
- Ebro 76.2%
- Inland basins of Catalonia at 62.8%
Precipitation has greatly affected the entire peninsula. The maximum has been produced in Vigo with 175.2 mm (175.2 l / m²).
The situation of the basins, in cubic hectometers, is detailed in the attached table: