AfA480: 2004 Climate Change Fluvial Flood Depth Grids for England

England's Environment Agency provides modelled fluvial flood depth data for two annual chance scenarios (0.1% and 1%) under a 2004 climate change sensitivity analysis. The data, generated using the JFlow hydrodynamic model on a 5x5m grid, was produced to fill gaps in detailed local modelling for spatial planning flood zone definition. This dataset covers the SY 100x100km Ordnance Survey grid tile, with similar data available for other tiles across the country.

Use Cases

• High-level sensitivity analysis of climate change impacts on flood extents based on a modelled 20% increase in peak flows.
• Strategic spatial planning to define approximate Flood Zones in areas lacking detailed local models in 2004.
• Preliminary regional flood risk assessment for the SY grid reference area in England.

Strengths

• Provides high-resolution modelled flood depth data on a consistent 5x5m grid across its coverage area.
• Covers two specific flood probability scenarios (0.1% and 1% annual chance) for sensitivity analysis.
• Dataset is part of a national series (AfA480) with coverage available for the whole of England.

Limitations

• The modelling methodology and climate change allowances are based on 2004 standards and have not been updated, making the data potentially outdated.
• Sources conflict on the specific annual chance scenario, listing both 0.1% and 1%.
• Critical metadata such as row count, specific column names, license, and author are missing from all platform entries.

Provenance

Source

Environment Agency (UK)

Collection Method

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

Time Range

2004

Freshness

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

Geography

Covers the SY 100x100km Ordnance Survey National Grid tile in England; similar data exists for other tiles covering the whole of England.