England Flood Depth Grids for 0.1% Annual Chance, 2004

Modelled fluvial flood depth data was produced for England in 2004 using the JFlow hydrodynamic model on a 5x5m grid. The Environment Agency created this dataset for the 0.1% annual chance flood scenario to define Flood Zones for spatial planning. This specific file covers the 100x100km Ordnance Survey National Grid reference SD.

Use Cases

• Assessing broad-scale flood risk for spatial planning based on modelled flood depth extents.
• Comparing generalised 2004 flood depth data with later local detailed modelling.
• Supporting catchment or shoreline management plan studies based on the 0.1% annual chance flood scenario.

Strengths

• Data modelled on a high-resolution 5x5m grid.
• Covers a specific 100x100km national grid tile (SD) for England.
• Created using a two-dimensional hydrodynamic model (JFlow).

Limitations

• Dataset has not been updated since its creation in 2004.
• Description metadata is limited; actual data quality requires manual inspection after download.
• Not suitable for identifying individual property flooding or detailed site-specific assessments.

Provenance

Source

Environment Agency, with contributions from Centre for Ecology & Hydrology, Defra, Met Office, DARD Rivers Agency, Cranfield University, James Hutton Institute, and Ordnance Survey.

Collection Method

Created using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Geography

England, specifically the Ordnance Survey National Grid reference SD tile.