Updated national flood risk maps from the Environment Agency now in Scalgo Live
- Nya data
The Environment Agency (EA) recently released updated national flood risk maps for England, called National Flood Risk Assessment (NaFRA2), replacing the 2017 hazard maps. You can now access the updated and restructured flood risk maps in Scalgo Live.
The new maps are called Risk of Flooding from Rivers and the Sea (RoFRS) and Risk of Flooding from Surface Water (RoFSW) and they provide important information for supporting flood mitigation and surface water management. The new maps give a clearer, more detailed picture of current and future flood risks across England.
Easily access the flood risk datasets in Scalgo Live by simply clicking the sublayers within the 'EA - Rivers and Sea, 2025' and 'EA - Surface Water, 2025' libraries.
You can access the RoFRS and RoFSW flood risk datasets in Scalgo Live (Great Britain theme) in the Library - look for 'EA – Rivers and Sea, 2025' and 'EA - Surface Water, 2025'.
Note: The previous versions - 'EA - Rivers and Sea, 2017' and 'EA ' Surface Water, 2017' - remain available, so you won't lose any existing information and can continue to use them for comparison.
'EA - Rivers and Sea, 2025' - RoFRS
In the 'EA – Rivers and Sea, 2025' layer, you can access ten different maps that let you explore flood risk from rivers and the sea – including the impact of flood defences. Here's what you'll find:
- Flood Zones 2 & 3 are the primary layers used for planning and flood risk assessment.
Zone 2: Moderate risk, with a 0.1%–1% annual chance of flooding from rivers or 0.1%–0.5% from the sea.
Zone 3: Highest risk, with a 1% or greater annual chance from rivers or 0.5% or greater from the sea.
Flood Zones reveal areas currently at risk of flooding from rivers and the sea.
- The Depth layer shows not only where flooding might happen, but also how deep the water could get in different risk bands. This added detail helps you better assess the severity of potential floods and plan accordingly.
See flood likelihoods by depth on the map’s bottom right, selecting depths via the top-right bar; colors indicate river and sea flood risk levels.
• The Defended layers (at 0.1%, 1%, and 3.3% annual exceedance probabilities, or AEP) show present-day and future (climate change) flood risk, assuming flood defences work as intended.
• The Undefended layers at 0.1% and 1%/0.5% AEP show flood extents if defences were not present.
• The Historic Flood Map highlights areas that have experienced flooding in the past
• The Water Storage Areas layer identifies places that help manage flood peaks by temporarily storing water.
These classifications help guide development decisions, ensuring that flood risk is properly considered and managed in planning applications.
'EA - Surface Water, 2025' - RoFSW
Similarly, the 'EA - Surface Water, 2025' maps show where surface water flooding occurs when heavy rain can’t drain away or soak into the ground. You get information on both the extent and depth of potential flooding, as well as risk categorised into high, medium, or low. The dedicated Depth map provides even more detail, highlighting how deep water levels could get in different risk areas helping you quickly assess not just where flooding might occur, but also its potential severity.
View flood extent, depth, and risk levels at a glance with the detailed Depth map.
Do you want to know more?
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