Flood damage curves relate the proportion of damage experienced by assets as a function of flood parameters (e.g. flood depth, duration of flooding, flow speed)
Flood damage curves are usually derived from:
- Assessing damage from flood events and relating it to measured (or modelled) flood conditions; or
- Using building structural capacity to estimate the damage likely to be associated with different flood parameters.
Both approaches need to be related spatially, and within that, to consider 'internal' variability, such as variation of floor level (rarely known), or local topographic effects (usually we look in contour bands).
These techniques have mainly been established for riverine flooding. Consequently, for a regional assessment, they are usually include quite large 'internal' topographic effects (e.g. in a 3-4m flood depth range, buildings will be distributed across the whole range).
For coastal flooding, there are a few differences:
- Flood range is generally much tighter
- Flood exposure is much closer to a uniform threshold, particularly if there is a set policy
- Building types may tend to have partial flood proofing, even if not part of policy
- Waves can contribute to flood damage
If anyone has recommendations on this topic, I would appreciate being pointed in that direction!
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