Why has the data changed so much?

Created: 28 January 2025 Updated: 28 January 2025

The original National Flood Risk Assessment was produced over 20 years ago, as the first national flood risk assessment. This resulted in the ‘Risk of Flooding from Rivers and Sea’ (RoFRS) which was our primary dataset. This was used to communicate flood risk to the public and our partners. RoFRS was first published as a map in 2013.

New local information has been included in quarterly updates, but the last national update was in 2018.

The new National Flood Risk Assessment is not just replacing original data. The latest National Flood Risk Assessment has delivered a new system for modelling flood risk and can generate a wider range of outputs. This is has provided a progression in how flood risk is modelled and has led to better ways of modelling climate change. Data is now available for a 2m square gird for all products and has meant changes to the data format, size and how it is presented.

Please see our announcements about Updates to national flood and coastal risk erosion  risk information for  more details.