England Flood Depth Grids for 1% Annual Chance, 2004

Modelled fluvial flood depth data for England was produced in 2004 using the JFlow hydrodynamic model on a 5x5m grid for the 1% annual chance flood scenario. The Environment Agency created this dataset as a by-product of a generalised modeling project to fill gaps in detailed local data for spatial planning flood zone definitions. This specific file covers the 100x100km Ordnance Survey National Grid reference NX.

Use Cases

• Assessing broad catchment-scale flood risk based on modelled flood depth data.
• Supporting spatial planning decisions for flood zone definition based on generalised modeling.
• Providing baseline data for Shoreline Management Plan studies based on 5x5m grid resolution.
• Identifying areas where more detailed local modeling may be required based on the 2004 generalised data.

Strengths

• Data covers the whole of England.
• Modeled on a 5x5m grid resolution.
• Created using a two-dimensional hydrodynamic model (JFlow).

Limitations

• Data is from 2004 and has not been updated; many areas have been replaced by more recent local detailed modeling.
• Description metadata is limited; actual data quality requires manual inspection after download.
• The dataset is explicitly not suitable for identifying individual property flood risk or for detailed decision making.

Provenance

Source

Environment Agency, UK.

Collection Method

Created using the JFlow two-dimensional hydrodynamic model.

Time Range

2004.

Geography

England, specifically the Ordnance Survey National Grid reference NX.