AfA480: 2004 Climate Change Fluvial Flood Depth Grids for England

England-wide modelled fluvial flood depth data, produced in 2004 using the JFlow hydrodynamic model on a 5x5m grid. The dataset provides a high-level sensitivity analysis for climate change effects, simulating a 20% increase in peak flows for 1% and 0.1% annual chance flood events. It was created to fill gaps in detailed local modelling for spatial planning and defines extents of Flood Zones.

Use Cases

• High-level flood zone definition for spatial planning based on modelled flood extents.
• Sensitivity analysis of potential climate change impacts using a simulated 20% peak flow increase.
• Preliminary regional flood risk assessment where detailed local models are unavailable.

Strengths

• Nationwide coverage for England, providing a consistent baseline.
• High spatial resolution modelled on a 5x5 meter grid.
• Explicitly models a specific climate change scenario (20% increase in peak flows).

Limitations

• Data is from 2004 and has not been updated; climate change allowances have since changed.
• Explicitly not suitable for property-level assessment or detailed decision-making.
• Metadata completeness is low; specific column names, row counts, and license information are unknown.

Provenance

Source

Environment Agency (UK), Approval for Access product AfA480.

Collection Method

Produced using the two-dimensional JFlow hydrodynamic model.

Time Range

2004

Freshness

Last updated metadata dates are from July 2026, but the underlying modelled data is from 2004.

Geography

England, delivered in 100x100km Ordnance Survey National Grid tiles (e.g., TF, TQ, TV).