Modelled Fluvial Flood Depth Data for England, 2004 Generalised Project

Modelled fluvial flood depth data was created for the 1% annual chance of flooding situations as a by-product from the 2004 generalised modelling project. The data covers the whole of England, but this specific file is for the Ordnance Survey National Grid reference TA. A two-dimensional hydrodynamic model called JFlow was used to produce the data on a 5x5m grid.

Use Cases

• Assessing broad catchment-scale flood risk based on modelled flood depth data.
• Supporting Shoreline Management Plan development based on generalised flood extents.
• Historical comparison of flood zones before local detailed modelling updates.
• Filling gaps in flood zone extents for spatial planning where no detailed local data existed in 2004.

Strengths

• Data is modelled on a 5x5m grid resolution.
• Coverage is stated for the whole of England.
• Created using a specific two-dimensional hydrodynamic model (JFlow).

Limitations

• The data is from 2004 and has not been updated; more recent, accurate local modelling is available for many areas.
• Description metadata is limited; actual data quality requires manual inspection after download.
• The data is explicitly not suitable for identifying whether an individual property will flood or for detailed decision making.

Provenance

Source

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

Collection Method

Created using the JFlow two-dimensional hydrodynamic model for the 2004 generalised modelling project.

Time Range

2004

Geography

England, specifically for Ordnance Survey National Grid reference TA.