Reservoirs. Volume of water
| Rivers and tributaries | Reservoir | Capacity (hm³) | Size of basin (km²) | Volume of water (hm³) |
|---|---|---|---|---|
| Internal basins | ||||
| Muga | Boadella | 61 | 182 | 10.6 |
| Ter | Sau | 165 | 1,564 | 29.7 |
| Susqueda | 233 | 1,850 | 79.8 | |
| Llobregat | la Baells | 109 | 532 | 44.1 |
| Cardener | Sant Ponç | 24 | 318 | 7.9 |
| Llosa del Cavall | 80 | 200 | 19.3 | |
| Foix | Foix | 4 | 290 | 2.5 |
| Gaià | Catllar | 59 | 370 | 0.2 |
| Riudecanyes | Riudecanyes | 3 | 31 | 0.1 |
| Siurana | Siurana | 12 | 60 | 0.1 |
| Ebre basin | ||||
| Segre | Oliana | 101 | 2,675 | 59.2 |
| Rialb | 404 | 3,320 | 177.5 | |
| Sant Llorenç de Montgai | 10 | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | |
| Noguera Pallaresa | Estany Tort | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available |
| Estany Saburó | 11 | 2 | .. Confidential data, low reliability or not available | |
| Estany Mar | 14 | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | |
| Certascan | 16 | .. Confidential data, low reliability or not available | 10.5 | |
| Tremp/Talarn | 227 | 2,070 | 117.6 | |
| Terradets | 33 | 2,620 | 31.7 | |
| Camarasa | 163 | 2,850 | 98.9 | |
| Capdella | 50 | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | |
| Llacs Espot | 10 | 29 | .. Confidential data, low reliability or not available | |
| Val d'Aràn | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | |
| Noguera Ribagorçana | Baserca | 22 | .. Confidential data, low reliability or not available | 19.8 |
| Llauset | 17 | .. Confidential data, low reliability or not available | 10.2 | |
| Cavallers | 16 | 26 | 14.5 | |
| Escales | 152 | 731 | 108.9 | |
| Canelles | 679 | 1,628 | 236.2 | |
| Santa Anna | 237 | 1,757 | 134.4 | |
| Baix Ebre | Flix | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available | .. Confidential data, low reliability or not available |
| Guiamets | 10 | 75 | 0.2 | |
| Riba-Roja | 210 | 79,177 | 200.1 | |
| Source: Agència Catalana de l'Aigua (Internal basins); Confederación Hidrográfica del Ebro (Ebre basin). | ||||
| Note: Water in reservoir in the first week of October of each year. | ||||
| (..) Confidential data, low reliability or not available. | ||||
Last update: July 22, 2025.
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 "..".