Overview
- The hydrological year that ended on October 31, 2026 recorded historically low river discharges at many German gauges, prompting the Bundesanstalt für Gewässerkunde to require a redefinition of NNQ, the lowest-ever observed flow.
- An analysis by NIWIS and the Science Media Center found that in late summer about 35% of gauges showed flows in the 'very low' or 'extremely low' categories, with roughly 54% of Rhine gauges and up to 87% in parts of the Danube basin falling into those categories.
- Low flows had concrete impacts on people and the economy: Rhine freight had to cut loads or stop on sections and Austrian hydropower output fell by more than 40% at times, reducing transport capacity and electricity generation.
- Experts link the shortfall to climate-driven shifts—higher evaporation and earlier snow and glacier melt that move runoff into spring—and to long-term river engineering and drainage that speed runoff and lower groundwater storage.
- Recovery now depends on prolonged, widespread 'landrain' to refill soils and aquifers, but forecasters warn a likely El Niño winter could bring warmer, low-snow conditions and make a quick rebound unlikely while long-term renaturation and climate mitigation remain essential.