AfA480: 2004 Climate Change Fluvial Flood Depth Grids for England

England-wide modelled fluvial flood depth data, produced in 2004 as part of a generalised modelling project to define flood zones for spatial planning. The data provides a high-level sensitivity analysis of climate change effects, simulating a 20% increase in peak flows for 0.1% and 1% annual chance flood events. It was generated using the JFlow two-dimensional hydrodynamic model on a 5x5 meter grid but has not been updated since its creation.

Use Cases

• High-level sensitivity analysis of climate change impacts on flood risk based on a modelled 20% increase in peak flows.
• Defining approximate extents of Flood Zones for regional spatial planning, where detailed local models were unavailable in 2004.
• Preliminary screening for areas that may require more detailed, site-specific flood risk assessments.

Strengths

• Provides national coverage for England, filling data gaps where detailed local models were absent in 2004.
• Based on a specific, documented modelling methodology using the JFlow hydrodynamic model on a 5x5m grid.
• Explicitly models a defined climate change scenario (20% increase in peak flows) for sensitivity analysis.

Limitations

• The dataset has not been updated since 2004, and climate change allowances used by authorities have since changed.
• Metadata completeness is low; specific column names, row counts, file sizes, and license information are not provided across sources.
• The data is explicitly not suitable for property-level assessment, detailed decision-making, or site-specific flood risk studies.

Provenance

Source

Environment Agency (UK)

Collection Method

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

Time Range

2004 (modelling date)

Freshness

Last updated metadata dates are from 2026-07-06, but the underlying modelled data is from 2004 and has not been updated.

Geography

England, available in 100x100km Ordnance Survey grid tiles (e.g., NU, NT)