Wildfire case study · Sierra Bermeja, Málaga · Spain · 2021
The Sierra Bermeja fire illustrates two problems that continue after the main fire run: deciding which incident figures describe which assessment, and understanding how burned catchments may respond to later rainfall. Neither question is answered by a single headline area.
Evidence reviewed: 27 October 2026. This documentary comparison uses dated government releases and a published hydrological research abstract. It does not provide a property-specific flood assessment or a new reconstruction of fire behaviour.
What happened in Sierra Bermeja?
The Junta de Andalucía’s extinction announcement dates the start to 8 September 2021 at 21:35 and final extinction to 24 October at 19:00. It records 2,670 people evacuated and the death of forest firefighter Carlos Martínez Haro. [1]
A later official restoration update gives 14 September as the control date. [2] Control and extinction therefore mark different operational milestones. Using the earlier date as the end of all activity would erase the subsequent work recorded by the authorities.
| Date | Milestone | Reading limit |
|---|---|---|
| 8 September 2021 | Fire start reported at 21:35. [1] | Not the time of exposure at every location. |
| 14 September 2021 | Declared controlled. [2] | Not final extinction. |
| 24 October 2021 | Declared extinguished at 19:00. [1] | Not the completion of ecological recovery. |
Why do official burned-area figures differ?
The Junta’s 21 September statement explicitly described its approximately 9,640-hectare estimate as pending an official assessment after extinction. [3] The 24 October extinction release reported 8,401 hectares. [1] The national government’s 30 November record used 9,581.37 hectares. [4]
Tecnobosque analysis: these are dated, source-specific figures. The cited releases do not establish a complete reconciliation of their boundaries or methods. The fact that one figure is later—or has two decimal places—does not by itself establish that it supersedes all others.
Before calculating the percentage of a municipality or habitat affected, the appropriate perimeter and denominator must be identified. Combining an area from one assessment with a habitat fraction from another can create an unsupported result even when both original numbers are correctly quoted.
Why restoration included drainage and access
The September recovery announcement described work to assess affected watercourses and proposed measures including barriers made from vegetation and small check structures to reduce erosion. It also addressed access routes and potentially unsafe material. [3]
The later works update reported approximately 1,400 small barriers and 48,000 linear metres of contour barriers installed at that stage. It said the authorities had observed their performance after March rainfall. [2] These are reported implementation figures and observations, not a controlled estimate of how much flooding was prevented.
A structure count measures work delivered. Evaluating effectiveness also requires the rainfall experienced, sediment retained, maintenance condition and suitable comparison evidence. A successful observation at one site cannot demonstrate equal protection throughout every affected basin.
What the flood research examined
Antonio Gallegos Reina’s 2024 study, published in Estudios Geográficos, examines potential changes in flooding around Sierra Bermeja. Its abstract describes two methods: evaluating runoff before and after the fire, and modelling inundation extents across the principal affected catchments. [5]
The distinction between modelling and observation matters. A modelled inundation extent describes results under specified assumptions; it is not a statement that every mapped location actually flooded. A before-and-after comparison also needs consistent rainfall and modelling conditions if the effect of land-cover change is to be isolated.
This page does not reproduce a percentage increase or convert those results into a forecast for a house. Doing so would require examining the full model setup, scenarios, spatial limits and validation evidence. The abstract establishes the research question and approach, not every detail necessary for that application.
How to compare this incident with other fires
Keep the operational timeline, perimeter assessment and post-fire hazard study as separate evidence layers. Each has a different date, scale and purpose. This helps readers follow how the emergency changed without mistaking final extinction for the disappearance of every downstream risk.
Sources and scope
- Junta de Andalucía: Sierra Bermeja extinction announcement, 24 October 2021.
- Junta de Andalucía: emergency recovery works at 31% completion, historical progress report; figures describe that reporting stage.
- Junta de Andalucía: environmental recovery and development programme, 21 September 2021.
- Council of Ministers reference, 30 November 2021, Sierra Bermeja II emergency works.
- Gallegos Reina (2024): Analysis and modeling of changes in flood susceptibility following the Sierra Bermeja fire, Estudios Geográficos, 85(297), 1254. The published abstract was consulted for the methods described here.
Continue the evidence trail
- Guadalajara 2005: Rodenal forest recovery. Compare recruitment, survival and treatment timing with the drainage and restoration questions examined here.
- Sampson Flat: soil impacts and recovery evidence. Explore another recovery record while keeping each study’s measured outcomes separate.
Cite this analysis
Tecnobosque. Sierra Bermeja Fire 2021: Timeline, Area Estimates and Post-Fire Flood Risk. https://tecnobosque.com/sierra-bermeja-fire-2021/. Accessed [your access date].
For a specific incident figure or research finding, also cite the numbered source supporting it. This is a live page; retain a copy of the passage you use and its access date.