Heritage Disaster Risk: Planning for What You Cannot Rebuild.
The disaster that does the most lasting harm to heritage is often not the one that brings down a wall.
By Neil Fairburn · Director, Cultural Heritage Risk Management Ltd
Disaster risk for heritage gets imagined as the earthquake, the fire, the flood. Those matter. But the loss that proves hardest to recover from is frequently quieter, and it is the one most project teams never put on the register at all.
The cycle, briefly
Good practice here is not complicated, and it is well established. Disaster risk management for heritage runs on a cycle the recognised bodies share: understand the context, identify the risks, analyse them, evaluate them against each other, treat them, and monitor, then begin again. Treatment itself has an order, to avoid, block, detect, respond and recover. And it runs across three phases: before the event, during it (the first hours, when most avoidable loss happens), and after. The frameworks exist, from UNESCO's guidance for World Heritage to the DRR Sendai Framework, which, unusually, names cultural heritage directly. The problem is rarely the framework. It is that heritage is left out of the project's risk planning until something has already happened.
The risk that outranks the wall
Here is the part worth considering. The known agents that damage heritage are usually listed as physical forces, water, fire, pollutants, temperature and humidity. There is one that gets forgotten: dissociation, the loss of the records, the catalogue, the drawings, the knowledge of what a thing is and where it came from. An object whose context and documentation are gone is, in heritage terms, half destroyed even when it is physically intact. Consideration for the format of the data, its storage and even its use is often overlooked.
On a modern project this is not abstract. The condition surveys, the survey data, the monitoring data, the archive of what was found and what was done, often sit with one consultant, on one system, in one format, with no plan for continuity. That is a single point of failure, and it is a disaster risk in its own right. The fire that takes the building is a tragedy. The failed drive that takes the only record of the building is a different kind of loss, slower to notice and impossible to reverse, and it never appears on the risk register. I have encountered this on projects many times through RFI’s to heritage institutions, and found the information has been lost or rendered unusable.
Ranking risk honestly
Heritage risk gets scored, usually on likelihood, severity and the share of the asset affected, then banded from high to low and matched to a mitigation priority. The method is useful, with two cautions. The scoring is a simplification, three numbers added together, and it should be described as an approach rather than a standard. And risk priority is not the same as conservation priority. The most at-risk asset is not always the most significant one. A good plan keeps both in view and does not let the spreadsheet calculation make the decision on its own.
What good looks like
Mitigation organised by priority rather than site by site. A preference for simple, reversible measures over heavy engineering whose long-term effects nobody has modelled. Clear emergency roles agreed before the event, not improvised during it. And underneath all of it, single, accountable stewardship of the record, so the knowledge is maintained and survives the people and the project that produced it.
The test of a heritage disaster plan is not how it reads on the shelf. It is whether, in the first hours of a real event, someone knows who is responsible, what matters most, and where the record is kept. Most projects can answer none of those three. That, not the earthquake, is the risk worth managing first.