Reservoirs. Volume of water. By seasons
| Water in reservoir (three-monthly averages) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and tributaries | Reservoirs | Winter | Spring | Summer | Autumn | Annual average | Minimum volume | Date minimum volume | Maximum volume | Date maximum volume |
| Internal basins | ||||||||||
| Muga | Darnius Boadella | 15 | 43 | 39 | 38 | 34 | 10 | 6/3/2025 | 52 | 31/12/2025 |
| Ter | Sau | 30 | 114 | 102 | 89 | 84 | 9 | 14/2/2025 | 127 | 12/5/2025 |
| Ter | Susqueda | 93 | 168 | 183 | 193 | 160 | 85 | 1/3/2025 | 221 | 28/12/2025 |
| Llobregat | Baells | 69 | 107 | 97 | 89 | 90 | 59 | 3/3/2025 | 109 | 12/05/2025 |
| Cardener | Sant Ponç | 14 | 21 | 21 | 20 | 19 | 12 | 1/1/2025 | 23 | 25/05/2025 |
| Cardener | Llosa del Cavall | 30 | 57 | 65 | 62 | 53 | 27 | 21/2/2025 | 68 | 26/08/2025 |
| Foix | Foix | 4 | 4 | 3 | 3 | 3 | 3 | 13/12/2025 | 4 | 24/07/2025 |
| Gaià | Catllar | 1 | 1 | 1 | 1 | 1 | 1 | 5/12/2025 | 1 | 14/05/2025 |
| Riudecanyes | Riudecanyes | 2 | 3 | 2 | 2 | 2 | 1 | 1/1/2025 | 3 | 26/05/2025 |
| Siurana | Siurana | 1 | 3 | 2 | 2 | 2 | 1 | 6/3/2025 | 3 | 27/07/2025 |
| Ebre basin | ||||||||||
| Segre | Oliana | 44 | 65 | 70 | 61 | 60 | 39 | 1/12/2023 | 81 | 24/06/2024 |
| Segre | Rialb | 106 | 149 | 218 | 220 | 173 | 85 | 1/12/2023 | 317 | 30/11/2024 |
| Noguera Pallaresa | Sist. Capdella | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available |
| Noguera Pallaresa | Sist. Llacs Espot | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available |
| Noguera Pallaresa | Sist. Val d'Aran | 10 | 6 | 10 | 9 | 8 | 0 | 28/4/2024 | 10 | 31/05/2024 |
| Noguera Pallaresa | Certescans | 8 | 10 | 13 | 11 | 11 | 8 | 27/2/2024 | 11 | 26/07/2024 |
| Noguera Pallaresa | Tremp/Talarn | 132 | 177 | 202 | 142 | 164 | 100 | 16/2/2024 | 227 | 21/05/2024 |
| Noguera Pallaresa | Terradets | 32 | 32 | 32 | 31 | 32 | 30 | 14/12/2023 | 33 | 30/05/2024 |
| Noguera Pallaresa | Camarasa | 109 | 147 | 127 | 113 | 124 | 57 | 15/12/2023 | 156 | 23/03/2024 |
| Noguera Ribagorçana | Baserca | 12 | 11 | 19 | 20 | 16 | 3 | 18/3/2024 | 22 | 21/06/2024 |
| Noguera Ribagorçana | Llauset | 14 | 13 | 13 | 12 | 13 | 8 | 6/9/2024 | 16 | 30/10/2024 |
| Noguera Ribagorçana | Cavallers | 7 | 8 | 15 | 14 | 11 | 4 | 19/3/2024 | 16 | 19/10/2024 |
| Noguera Ribagorçana | Escales | 97 | 114 | 131 | 122 | 116 | 69 | 22/2/2024 | 148 | 30/05/2024 |
| Noguera Ribagorçana | Canelles | 144 | 167 | 240 | 272 | 206 | 123 | 1/12/2023 | 357 | 30/11/2024 |
| Noguera Ribagorçana | Santa Anna | 130 | 195 | 172 | 134 | 158 | 95 | 7/12/2023 | 207 | 8/05/2024 |
| Baix Ebre | Guiamets | 1 | 0 | 0 | 1 | 0 | 0 | 26/10/2024 | 1 | 26/11/2024 |
| Baix Ebre | Riba-roja | 195 | 193 | 197 | 193 | 194 | 142 | 20/11/2024 | 207 | 22/02/2024 |
| Units: Cubic hectometres. | ||||||||||
| Source: Agència Catalana de l'Aigua (Internal basins); Confederación Hidrográfica del Ebro (Ebre basin). | ||||||||||
| (..) Confidential data, low reliability or not available. | ||||||||||
Last update: September 29, 2026.
Methodological note
Definition of concepts
- Hydrographical basin
- Set of slopes that incline towards a single flow of water.
- Reservoir
- Large artificial lake that is formed by interrupting the flow of a river or by creating a lake by means of a large dam.
Methodological aspects
The Catalan Water Agency (ACA) manages and plans the water cycle, with a vision of integrated water systems, taking into account the balance of all ecosystems. Water becomes a basic structural and functional element to the environment and life. This management must be compatible with the growing demand for permanence, universality and immediacy of the citizens of an advanced society, and ensure quality and good service.
The hydrology section includes fluvial systems. The fluvial systems are distributed by basins. The data refers to the volume of water contributed by rivers at different observation points (gauging stations). As for reservoirs, the volume of water stored per season is recorded. Series tables complement the information to enable comparability.
When the value is lower than that of the minimum unit to be able to estimate the statistical operation or if it effects statistical confidentiality, the symbol used is "..".