ROSANA
Paraná · PARANAPANEMA
Useful capacity
407.56 hm³
Coordinates
22.602°S, 52.869°W
Operator
ONS
78.4% of useful capacity
Current fill
78.4%of useful capacity
vs 7 days ago
-7.8 pplosing
vs 1 year ago
+9.8 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
108%of normal
78.4% full on 2026-10-26, against an average of 72.4% for October across 2 years of readings (+6.0 points).
Rain over the last three months · 11 October 2026
Very wet
In the three months to 11 October 2026 the area around ROSANA had much more rain than normal, seen about one year in fifteen. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index +1.97). Rain, not storage. Brazil drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 1,918 hm³ |
| Usable capacity | 407.56 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| Province | Paraná |
| River basin | PARANAPANEMA |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 22.602°S, 52.869°W · Open in Google Maps
About ROSANA
As of October 26, 2026, ROSANA is at 78.4% of useful capacity, holding 319.5 hm³ of 407.56 hm³. Of the 1,918 hm³ total capacity, that is 16.7%. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 7.8 percentage points, and it is 9.8 points above its level on the same date a year earlier.
Across the readings we hold for ROSANA — 65 data points between October 26, 2025 and October 26, 2026 — the level has ranged from a low of 62.4% (October 22, 2026) to a high of 97.3% (March 13, 2026). On average the reservoir is fullest around March and at its lowest around October.
It is operated by ONS primarily for hydroelectric power. It lies within the PARANAPANEMA basin at 22.602°S, 52.869°W.
Key facts
- Current fill level
- 78.4% of useful capacity
- Water stored
- 319.5 hm³
- Total capacity
- 1,918 hm³
- Usable capacity
- 407.56 hm³
- 7-day change
- ▼ 7.8 pp
- Year-on-year
- ▲ 9.8 pp
- Primary use
- Hydroelectric power
- River basin
- PARANAPANEMA
- Operator
- ONS
- Coordinates
- 22.602°S, 52.869°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 78.4% | 319.5 |
| 25 Oct 2026 | 78.9% | 321.6 |
| 24 Oct 2026 | 68.6% | 279.5 |
| 23 Oct 2026 | 66.5% | 271.1 |
| 22 Oct 2026 | 62.4% | 254.4 |
| 21 Oct 2026 | 70.6% | 287.9 |
| 20 Oct 2026 | 87.8% | 357.9 |
| 19 Oct 2026 | 86.2% | 351.4 |
| 18 Oct 2026 | 71.7% | 292.1 |
| 17 Oct 2026 | 77.3% | 315.2 |
| 16 Oct 2026 | 77.3% | 315.2 |
| 15 Oct 2026 | 84.7% | 345 |