> For the complete documentation index, see [llms.txt](https://docs.answr.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.answr.space/api-data-layers/natural-disasters/flood-severity.md).

# Flood Severity

Flood hazard refers to the height in meters of sudden or non normally present appearing water. Flood hazard, in contrast to other natural disasters, is provided with the potential occurrence height (severity) for different return periods (10, 20, 50, 100, 200, 500 years) instead of probabilities of exceeding a threshold. This data layer is a result of processing and aggregating the data sources:

* [Global Surface Water](/data-sources/global-surface-water.md)
* [Flood Hazard Maps at European and Global Scale](/data-sources/flood-hazard-maps-at-european-and-global-scale.md)
* [AgERA5](/data-sources/agera5.md)