Global Flood Hazard Maps (GAR/UNEP)
Quick answer: Global flood hazard maps provide flood inundation extent for different return periods worldwide for risk assessment.
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Format
GeoTIFF
Geometry
Raster (flood extent)
Coverage
Global
Resolution
~90m to 1km
About this dataset
Global flood hazard maps showing inundation for different return periods from the UN Global Assessment Report.
Global flood hazard maps from the UN GAR and research groups provide flood inundation extents for riverine and coastal flooding at various return periods (10-yr to 500-yr) at approximately 90m to 1km resolution.
How to download
- 1 Open the UNEP GAR flood hazard portal.
- 2 Select flood type and return period.
- 3 Download the GeoTIFF flood extent raster.
- 4 Combine with population data for exposure analysis.
FAQ
What is a 100-year flood?
A 100-year flood has a 1% annual exceedance probability. Maps are available for 10, 50, 100, and 500-year return periods.
Are global flood maps accurate enough for local use?
They suit regional to national risk assessment. Local LiDAR DEMs are recommended for site-level planning.