AfA480: 2004 Climate Change Fluvial Flood Depth Grids for England

2004 modelled fluvial flood depth data for England, created for a 0.1% annual chance flood event under a climate change scenario. The data was produced using the JFlow two-dimensional hydrodynamic model on a 5x5m grid to fill gaps in detailed local modelling for spatial planning. It provides a high-level sensitivity analysis based on a 20% increase in peak river flows, but has not been updated since its creation.

Use Cases

• High-level sensitivity analysis of potential climate change effects on flood zones based on a 20% peak flow increase.
• Defining extents of Flood Zones for regional spatial planning where detailed local models were absent in 2004.
• Providing a historic baseline for comparing against more recent, detailed local flood modelling projects.

Strengths

• Provides national coverage for England, based on a consistent 2004 modelling exercise.
• Uses a specific two-dimensional hydrodynamic model (JFlow) on a detailed 5x5m grid.
• Based on a defined climate change scenario (20% increase in peak fluvial flows).

Limitations

• The dataset has not been updated since 2004, and climate change allowances have since changed.
• Metadata for specific technical attributes like row count, column names, and license is missing or listed as unknown across all sources.
• Explicitly not suitable for property-level assessment, detailed decision-making, or site-specific flood risk assessments.

Provenance

Source

Environment Agency (UK)

Collection Method

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

Time Range

2004

Freshness

Last updated metadata dates are 2026-07-06, but the underlying data is from 2004.

Geography

England, provided in 100x100km Ordnance Survey grid tiles (e.g., SO, ST).