Flooding and coastal erosion are among the most pressing environmental threats facing England today. As climate change accelerates, the risks associated with extreme weather events continue to rise. Recognising this, the Environment Agency (EA) has introduced NaFRA2 (National Flood Risk Assessment 2)—a significant update to the country’s flood risk assessment model. This advanced system builds upon previous assessments from 2014 and 2018 and provides a more detailed, data-driven approach to understanding flood risks.

What’s New in NaFRA2?

NaFRA2 is designed to give government agencies, local authorities, and communities an enhanced understanding of flood risks, helping them make informed decisions about flood resilience planning. Here’s what it brings to the table:

• More Accurate Risk Data: NaFRA2 incorporates improved modelling techniques and the latest climate projections to provide a clearer picture of flood risks across England.
• Expanded Scope: It assesses risk from multiple sources, including rivers, the sea, and surface water, offering a more comprehensive view of flooding threats.
• Climate Change Projections: For the first time, the model accounts for climate change-driven flood risks, helping authorities prepare for future challenges.

The Current and Future Flood Risk Landscape

The updated NaFRA2 assessment reveals some startling figures:

• 6.3 million properties in England are currently at risk of flooding from rivers, the sea, or surface water.

• This number could rise to 8 million (1 in 4 properties) by the middle of the century due to climate change.

• Surface water flooding is expected to increase by 43% between 2040–2060, affecting approximately 6.1 million properties.

• Coastal erosion risks continue to grow, with 3,500 properties at risk by 2055, rising to 10,100 by 2105.

These insights underscore the urgency of proactive flood risk management and climate adaptation strategies.

Key Findings: Flood Risk Across England

Surface Water Flooding

• 4.6 million properties are in areas at risk of surface water flooding—a 43% increase from previous assessments.
• 1.1 million properties now face high-risk levels, nearly triple previous estimates.
• The number of properties classified as medium-risk has also risen significantly.

Flooding from Rivers and the Sea

• 2.4 million properties remain at risk, a figure similar to past assessments.
• However, properties in high-risk zones have increased by 88% to 367,900.
• Many properties previously classified as medium-risk have now been recategorised as high-risk.

The risk extends beyond residential properties. Roads, railways, and farmland are also increasingly vulnerable, with 38% of roads and 37% of railway lines currently in at-risk areas—a percentage set to rise.

Challenges and Data Discrepancies

While NaFRA2 and NCERM represent a leap forward in flood and erosion risk assessment, discrepancies in the data have raised concerns. Users have noted inconsistencies between Web Map Services (WMS) feeds and downloadable TAB file data.

The Environment Agency has acknowledged these issues and confirmed that a future update will harmonise the datasets by removing an additional “very low chance” probability band that has led to variations in the data representation. This correction is essential to ensure accuracy and consistency across all platforms.

Why This Matters & How to Stay Prepared

With the increasing threat of flooding, it’s crucial for developers, businesses, and local authorities to stay ahead of the risks. The latest NaFRA2 and Flood Map updates provide essential tools for planning safer communities and protecting critical infrastructure.

If you want expert insights on how these changes might impact your developments or flood risk assessments, contact Urban Water today. Our team specialises in flood risk management and can help you navigate the evolving landscape of flood resilience planning.

📩 Get in touch with Urban Water for expert flood risk insights.