AfA238: 2004 Fluvial Flood Depth Grid for England

A 5x5m resolution grid of modelled fluvial flood depths for England, produced in 2004 using the JFlow hydrodynamic model. The data covers two flood probability scenarios: a 0.1% and a 1% annual chance of flooding, and was created to fill gaps in detailed local modelling for spatial planning. This generalised dataset is now superseded by more recent local models in many areas and is intended for broad-scale assessments only.

Use Cases

• Broad-scale flood risk assessment for spatial planning based on modelled flood extents and depths.
• Catchment-scale flood hazard analysis using the 5x5m grid data.
• Informing Shoreline Management Plans with generalised fluvial flood depth information.
• Historical reference for comparing flood modelling methodologies from 2004.

Strengths

• Provides high-resolution (5x5m grid) flood depth data for the whole of England.
• Based on a specific two-dimensional hydrodynamic model (JFlow), indicating a defined methodological origin.
• Covers two distinct, high-impact flood probability scenarios (0.1% and 1% annual chance).

Limitations

• The dataset has not been updated since its creation in 2004 and is superseded by more recent local detailed models.
• Explicit warnings state it is not suitable for property-level assessment or detailed decision-making.
• Metadata for size, row count, specific columns, and license is missing or listed as 'unknown' across all sources.

Provenance

Source

Environment Agency (UK)

Collection Method

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

Time Range

2004

Freshness

Last updated metadata dates are listed as 2026-07-06, but the underlying data is from 2004 and explicitly noted as not updated.

Geography

England, specifically provided in tiles corresponding to 100x100km Ordnance Survey National Grid squares (e.g., reference TV).