Risk register · entry
Q2 · The CoconutValencia DANA floods
A known flash-flood phenomenon; the regional alert went out hours too late.
The rare, high-impact event that was always coming, and was always going to be called unforeseeable afterwards.
Why this room
The physical hazard itself pays off simply and predictably (heavy rain, flooding, bounded by known ravine geography) with thin tails once you assume a working warning chain, which is textbook Coconut; the actual disaster only became fat-tailed and complex once a twelve-hour warning delay, fragmented regional/national command, and floodplain construction turned a forecastable weather event into a low-probability, high-consequence governance failure.
The record
- Death toll: 229 total across Spain, 224 in Valencia province (some early reports cited 220-238 before final counts settled)likely
- AEMET red alert issued 7:31-7:36am, 29 October 2024certain
- CECOPI (regional emergency coordination centre) not convened until 5pmlikely
- Mazon press conference at 1pm predicting storm would dissipate by 6pmlikely
- ES-Alert mobile warning issued at 20:11 (8:11pm), some sources say 20:28likely
- Rainfall: 772 litres/m2 in 24 hours at Turis; 184.6-185 litres/m2 in one hour (Spanish record)likely
- Peak flow measured at 3,500 cubic metres per second by the Jucar Hydrographic Confederationuncertain
- Economic damage estimates range 3.5bn euros (insured) to 17-30bn euros (total, various sources)uncertain
- Over 100,000 vehicles damaged, ~40,000 potentially total losses; some sources cite 144,000 vehicles destroyeduncertain
- 15,969 homes and ~66,000 commercial premises affectedlikely
- 130,000 protesters in Valencia on 9 November 2024 demanding Mazon's resignationlikely
- Carlos Mazon resigned as Valencian regional president on 3 November 2025certain
- 1957 Valencia flood killed at least 81 people, prompting the Turia river diversion ("Plan Sur")likely
Sources
The book
This entry is one of 111 in the register. The full story, and what it cost the people who lived it, is in Risky Business by Claudia Zeisberger, David Munro and Joanna Reijgersberg-Siew.
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