AfA480: 2004 Fluvial Flood Depth Change Under Climate Change

A 2004 Environment Agency dataset models the projected increase in fluvial flood depths across England due to a 20% increase in peak flows, a specific climate change scenario. It provides a 5x5 meter grid comparing baseline flood depths to those under the climate-adjusted scenario for both 1% and 0.1% annual probability flood events. This generalized national-scale model was created to fill data gaps for spatial planning but has not been updated since its creation.

Use Cases

• High-level regional flood risk screening based on generalized climate change projections.
• Assessing potential changes in flood zone extents for spatial planning using modeled depth differences.
• Studying the application of the JFlow two-dimensional hydrodynamic model for national-scale flood mapping.

Strengths

• Provides a consistent, wall-to-wall 5x5 meter grid coverage for England, filling historical data gaps.
• Derived from a specific, documented hydrodynamic model (JFlow) and a defined climate scenario (20% peak flow increase).
• Cross-platform presence on uk_data and eu_open_data indicates recognized utility for planning and research.

Limitations

• The model and climate change assumptions are from 2004 and have not been updated, making the projections outdated.
• Sources conflict on the annual probability covered, listing both 1% (1 in 100) and 0.1% (1 in 1000) events.
• Metadata is incomplete, with no information on row count, file size, license, or specific column structure.

Provenance

Source

Environment Agency (UK)

Collection Method

Generated as a by-product of the 2004 Generalised Modelling Project using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Freshness

Metadata last updated 2026-07-06, but the underlying data is from 2004 and explicitly noted as not updated.

Geography

England, specifically for the 100x100km Ordnance Survey National Grid reference SX tile. Data for the whole of England is noted as available.