AfA480: 2004 Fluvial Flood Depth Grids with Climate Change

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

Use Cases

• High-level sensitivity analysis of climate change impacts on flooding based on a modelled 20% peak flow increase.
• Defining extents of Flood Zones for regional spatial planning where detailed local models were unavailable in 2004.
• Preliminary assessment of flood risk areas under a specific climate change scenario for England.

Strengths

• Provides high-resolution modelled flood depth on a consistent 5x5m grid for the whole of England.
• Based on a specific, documented climate change scenario (20% increase in peak flows) for sensitivity analysis.
• Cross-platform presence on eu_open_data and uk_data indicates recognized importance and accessibility.

Limitations

• Data is from 2004 and has not been updated; climate change allowances have since changed, limiting current applicability.
• Sources conflict on the specific flood probability covered, listing both 0.1% (1 in 1000) and 1% (1 in 100) annual chance events.
• Severe metadata gaps: column names, row counts, file size, license, and specific author are unknown.

Provenance

Source

Government Digital Service (from eu_open_data platform). Product is Approval for Access AfA480.

Collection Method

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

Time Range

2004

Freshness

Metadata last updated on 2026-07-06, but the underlying data is from 2004.

Geography

England, specifically for the 100x100km Ordnance Survey National Grid reference SD. Data for other grid references is reportedly available.