The reservation by areas is as follows:
- Eastern Cantabrian is at 93.2%
- Western Cantabrian at 87.6%
- Miño-Sil 84.8%
- Galicia Costa at 87.4%
- Internal basins of the Basque Country at 90.5%
- Duero at 87.8%
- Tagus at 66.9%
- Guadiana 42.2%
- Red, Odiel and Piedras at 79.0%
- Guadalete-Barbate at 50.5%
- Guadalquivir at 49.1%
- 58.3% Andalusian Mediterranean Basin
- Safe at 47.6%
- Jucar at 59.2%
- Ebro at 91.2%
- Inland basins of Catalonia at 94.2%
Rainfall has affected the Atlantic slope and has been scarce on the Mediterranean slope. The maximum was produced in Molina de Aragón with 61.6 mm (61.6 l / m²).
The situation of the basins, in cubic hectometers, is detailed in the attached table:
