Sau
Barcelona · Catalonia · Cuencas Internas de Cataluña
Capacity
165 hm³
Coordinates
41.976°N, 2.384°E
Operator
ACA
70.9% full
Current fill
70.9%vs 7 days ago
+2.4%gaining
vs 1 year ago
+10.3%year-over-year
7-day trend
↑rising
Drought context
Storage vs October average
133%of normal
70.9% full on 2026-10-13, against an average of 53.3% for October across 9 years of readings (+17.6 points).
Rain over the last three months · 21 September 2026
Extremely dry
In the three months to 21 September 2026 the area around Sau had extremely little rain for the season, a shortfall seen about one year in forty. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −2.37). Rain, not storage.
EU drought indicator · 11 September 2026
Watchrainfall deficit
The European Drought Observatory's combined reading of rain, soil moisture and vegetation at this point. Watch means rain has been short, Warning that the soil has dried out, Alert that vegetation is visibly stressed; Recovery means the shortfall is easing. Ground conditions, not the reservoir's storage. Spain drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 165 hm³ |
| Usable capacity | 148.5 hm³ |
| Primary use | Multi-purpose |
| Operator | ACA |
| Province | Barcelona |
| Autonomous community | Catalonia |
| River basin | Cuencas Internas de Cataluña |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 41.976, 2.384 · Open in Google Maps
About Sau
As of October 13, 2026, Sau is filled to 70.9% of its total capacity, holding roughly 117 hm³ of water out of a maximum 165 hm³. At this level the reservoir is within its normal operating range. Of that total, about 149 hm³ is usable (live) storage.
Over the most recent week on record the fill level has risen by 2.4 percentage points, and it is 10.3 points above its level on the same date a year earlier.
Across the readings we hold for Sau — 418 data points between October 16, 2018 and October 13, 2026 — the level has ranged from a low of 1.2% (March 5, 2024) to a high of 100.0% (January 28, 2020). On average the reservoir is fullest around June and at its lowest around October.
It is operated by ACA primarily for multiple purposes. It lies within the Cuencas Internas de Cataluña basin at 41.976°N, 2.384°E.
Key facts
- Current fill level
- 70.9%
- Water stored
- 117 hm³
- Total capacity
- 165 hm³
- Usable capacity
- 149 hm³
- 7-day change
- ▲ 2.4 pts
- Year-on-year
- ▲ 10.3 pts
- Primary use
- Multipurpose
- River basin
- Cuencas Internas de Cataluña
- Operator
- ACA
- Coordinates
- 41.976°N, 2.384°E
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 70.9% | 117 |
| 6 Oct 2026 | 68.5% | 113 |
| 29 Sep 2026 | 70.3% | 116 |
| 22 Sep 2026 | 73.3% | 121 |
| 15 Sep 2026 | 73.9% | 122 |
| 8 Sep 2026 | 73.3% | 121 |
| 1 Sep 2026 | 74.5% | 123 |
| 25 Aug 2026 | 77.0% | 127 |
| 18 Aug 2026 | 78.8% | 130 |
| 11 Aug 2026 | 79.4% | 131 |
| 4 Aug 2026 | 80.0% | 132 |
| 28 Jul 2026 | 81.8% | 135 |