England Flood Depth Model for 1% Annual Chance, 2004 Grid TM

2004 modelled fluvial flood depth data for England, produced for the 1% annual chance of flooding scenario using the JFlow hydrodynamic model on a 5x5m grid. The data was created by the Environment Agency as part of a generalised modelling project to fill gaps in detailed local data for spatial planning flood zone definitions. It covers the Ordnance Survey National Grid reference TM (a 100x100km square), but similar datasets exist for other grid references across England.

Use Cases

• Assessing broad-scale flood risk for spatial planning based on modelled flood depth extents.
• Identifying areas potentially within Flood Zones for high-level planning based on 2004 generalised modelling.
• Comparing generalised 2004 model outputs with more recent local detailed modelling where available.

Strengths

• Modeled on a high-resolution 5x5m grid.
• Covers a standardized 100x100km grid square (TM) for consistent analysis.
• Created using a two-dimensional hydrodynamic model (JFlow).

Limitations

• Data is from 2004 and has not been updated; more recent local detailed modelling exists for many areas.
• Description metadata is limited; actual data quality requires manual inspection after download.
• Not suitable for identifying individual property flood risk or detailed site-specific assessments.

Provenance

Source

Environment Agency

Collection Method

Created using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Geography

Ordnance Survey National Grid reference TM (100x100km square in England)