What is a DANA and why was it so destructive
A DANA (Depresión Aislada en Niveles Altos — Isolated Depression at High Levels) is a meteorological phenomenon that occurs when a pocket of cold air at altitude becomes isolated from the general atmospheric flow. Commonly known in Spanish as «gota fría» (cold drop), meteorologists prefer the term DANA for its technical precision.
On October 29, 2024, a particularly violent DANA stalled over eastern Spain and discharged historic amounts of rain in the headwaters of the ravines in the province of Valencia. In Turís, 771 litres per square metre were recorded in 24 hours, with more than 180 litres in a single hour — an all-time record in Spain. That intensity triggered flash floods in ravines such as the Poyo, whose flow reached a peak of 2,409 cubic metres per second.
The combination of torrential rain concentrated in ravine headwaters, the terrain's orography, and the high population density in the discharge zones turned the phenomenon into one of the most devastating natural catastrophes in Spain's recent history.
The figures of the tragedy
The numbers from the Valencia DANA reflect the magnitude of a disaster that left an indelible mark on the Valencian community and the entire country.
Deaths and injuries. 232 people died in the province of Valencia, according to the count of the Catarroja Court of First Instance, which in September 2026 raised the figure after recognising as victims people who died in the days following the flood. On the first anniversary, the official toll stood at 229 dead and three missing. Victims in Castilla-La Mancha and Andalusia, also hit by the DANA, add to this toll. There were 2,641 injuries and 117,000 people received medical attention. An estimated 303,295 people were affected directly or indirectly, and more than 80,000 could develop post-traumatic stress disorder in the zero zone.
Economic damage. The diagnosis of the Generalitat's Recovery Plan put material damage at €17.8 billion, to which the Consell added a further €12 billion to restore infrastructure and adapt the territorial model. The estimated total bill amounts to around €29 billion.
Devastated area. 564 square kilometres across 75 municipalities in the province of Valencia were devastated; in a broader sense, the Generalitat's diagnosis counts 103 affected municipalities. One million people live in this area, which accounts for 30% of the province's GDP and employment.
The zero zone municipalities
Fifteen municipalities made up the so-called «zero zone» of the DANA, the most damaged by the floods. Paiporta, Catarroja and Aldaia stand out, each with more than 20,000 affected residents. These municipalities have a population density of 2,098 inhabitants per square kilometre — compared to 250 in the city of Valencia — account for 10% of the province's population and have a high business density of 29.7 companies per square kilometre.
Images of streets turned into mud rivers, cars swept away by the current and residents sheltering on the rooftops of their homes went around the world and generated an unprecedented wave of solidarity.
Impact on infrastructure and the environment
The DANA caused extensive damage to the province's infrastructure network:
- Roads and railways. 1,450 km of roads damaged, 566 km of railway lines, 140 road sections destroyed, 380 bridges and viaducts affected and 2,755 km of forest tracks made unusable.
- Homes and businesses. 66,000 commercial premises affected, 15,969 homes damaged — 1,530 declared uninhabitable — and 144,000 vehicles rendered unusable, 85% total losses.
- Education and health. 115 educational centres affected with more than 48,000 students impacted, 136 socio-healthcare facilities damaged and 57 health centres with damage.
- Environment. 123 water treatment plants damaged. 74% of the province's transport network suffered some type of damage.
Accumulated waste reached one million tonnes, removed at an average of 15,000 tonnes per day. 70,000 cubic metres of mud and 20,000 tonnes of reeds were evacuated.
The solidarity response
The tragedy triggered a chain of solidarity that mobilised thousands of volunteers from across Spain. Anonymous individuals, companies, organisations and public administrations coordinated clean-up, debris removal and support for those affected. Social media became tools for citizen organisation, with calls for donations, collection points and volunteering routes.
There are no open causes for the DANA on Donation Pool. Anyone wishing to support the recovery of the affected municipalities today can do so through the local bodies and NGOs still working on the ground, or create their own campaign on the platform.
Lessons for the future
The Valencia DANA left lessons that the country cannot ignore. The need to review the urban development model in risk zones, the importance of early warning systems and the urgency of adapting infrastructure to climate change are conclusions that experts repeat after each catastrophe of this magnitude.
Adapting to the new climate context requires investment in prevention, rigorous territorial planning and a culture of prevention that anticipates increasingly frequent scenarios. Citizen solidarity proved to be a fundamental pillar, but it cannot replace the preventive action of institutions.