AfA480: 2004 Climate Change Fluvial Flood Depth Grids for England

Modelled fluvial flood depth data with climate change was created in 2004 for the 1% annual chance of flooding situation. The data is a by-product of a generalized modelling project using the JFlow two-dimensional hydrodynamic model on a 5x5m grid, designed to fill gaps in detailed local data for spatial planning. It provides a high-level sensitivity analysis based on a 20% increase in peak flows, but the dataset has not been updated since its creation.

Use Cases

• High-level flood zone definition for spatial planning based on generalized 2004 modelling.
• Sensitivity analysis of potential climate change effects using a 20% peak flow increase scenario.
• Preliminary assessment of flood depth on a 5x5m grid for areas lacking detailed local models.

Strengths

• Provides national-scale coverage for England, though individual downloads are for specific 100x100km grid tiles.
• Offers high-resolution modelled flood depth data on a consistent 5x5m grid.
• Based on a specific, documented modelling methodology using the JFlow hydrodynamic model.

Limitations

• The dataset is outdated, having been created in 2004 and not updated since; climate change allowances have since changed.
• Metadata completeness is low, with unknown column structure, row count, size, and license information across all sources.
• Explicitly not suitable for property-level assessment, detailed decision-making, or site-specific flood risk assessments.

Provenance

Source

Government Digital Service (from eu_open_data platform metadata).

Collection Method

Produced via the 2004 generalized modelling project using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Freshness

Last metadata update recorded as 2026-07-06, but the underlying data is from 2004.

Geography

England, specifically for the Ordnance Survey National Grid reference ST (100x100km tile); data is available for the whole of England across different grid references.