| River basin district | Summer | Winter |
|---|---|---|
| Cyprus (CY) | 81.41 | |
| Segura (ES) | 55.4 | 8.71 |
| Aegean Islands (GR) | 54.8 | 10.48 |
| Guadiana (ES and PT) | 54.26 | 1.58 |
| Andalusia Atlantic Basins (ES) | 49.18 | 5.32 |
| Thessalia (GR) | 45.57 | 3.44 |
| Balearic Islands (ES) | 41.14 | 14.91 |
| Jucar (ES) | 40.79 | 6.79 |
| North Eastern (UK) | 38.76 | 24.83 |
| Attica (GR) | 38.52 | 12.43 |
| Ebro (ES) | 34.44 | 5.72 |
| Eastern Sterea Ellada (GR) | 33.34 | 3.46 |
| Western Macedonia (GR) | 32.07 | 3.63 |
| Western Sterea Ellada (GR) | 25.61 | 0.1 |
| Sicily (IT) | 25.27 | 2.57 |
| Tagus and Western Basins (ES and PT) | 23.95 | 3.31 |
| Crete (GR) | 23.22 | 0.82 |
| Douro (ES and PT) | 20.53 | 0.17 |
| Andalusia Mediterranean Basins (ES) | 20.04 | 1.29 |