AfA480: 2004 Climate Change Fluvial Flood Depth Grids for England

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

Use Cases

• High-level flood zone definition for spatial planning based on modelled 2004 climate change scenarios.
• Sensitivity analysis of potential climate change impacts on fluvial flooding using a 20% peak flow increase.
• Regional-scale flood risk screening using the 5x5m resolution JFlow model outputs.

Strengths

• Provides national coverage for England, based on a consistent 2004 modelling exercise.
• Offers high spatial resolution data on a 5x5m grid from a two-dimensional hydrodynamic model.
• Includes scenarios for both 1% (1 in 100) and 0.1% (1 in 1000) annual chance flood events.

Limitations

• The dataset has not been updated since its creation in 2004, and climate change allowances have since changed.
• Explicitly not suitable for identifying individual property flood risk or for detailed, site-specific decision-making.
• Metadata completeness is low, with no column details, row counts, or license information provided across sources.

Provenance

Source

Environment Agency

Collection Method

Produced as a by-product of the 2004 generalised modelling project using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Freshness

Last updated metadata dates from 2026-07-06, but the underlying data is from 2004 and is stated as not updated.

Geography

England, available in 100x100km Ordnance Survey National Grid tiles (e.g., reference NX).