The reservation by areas is as follows:
- Eastern Cantabrian is 80.8%
- 70.3% Western Cantabrian
- Miño-Sil at 77.7%
- Galicia Costa at 81.3%
- Internal basins of the Basque Country at 85.7%
- Duero at 72.3%
- 54.2% cut
- Guadiana at 41.2%
- Red, Odiel and Piedras 79.9%
- 51.5% Guadalete-Barbate
- Guadalquivir at 47.8%
- 54.3% Andalusian Mediterranean Basin
- 39.3% safe
- Juice 47.6%
- Ebro at 78.3%
- Inland basins of Catalonia at 92.8%
Precipitation has been abundant in the Atlantic slope and has affected the Mediterranean slope to a lesser extent. The maximum has been produced in San Sebastián (Donostia) with 74.2 mm (74.2 l / m²).
The situation of the basins, in cubic hectometers, is detailed in the attached table: