Flood Depth Grid for England, 0.1% Annual Chance, 2004 Model

Modelled fluvial flood depth data was created for the 0.1% annual chance of flooding situations as a by-product from the 2004 generalised modelling project. The Environment Agency produced this data using the JFlow hydrodynamic model on a 5x5m grid to fill gaps where no detailed local modelled data existed. The dataset covers the whole of England, but this specific file is for the Ordnance Survey National Grid reference NX.

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 using the 2004 generalised modelling project output.
• Identifying areas lacking detailed local flood models for further study.

Strengths

• Data was produced using a two-dimensional hydrodynamic model (JFlow).
• Model output is on a 5x5m grid resolution.
• Dataset covers the whole of England for the specified flood probability.

Limitations

• The dataset was created in 2004 and has not been updated.
• Description metadata is limited; actual data quality requires manual inspection after download.
• The data is not suitable for identifying whether an individual property will flood or for detailed decision making.

Provenance

Source

Environment Agency

Collection Method

Created using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Geography

England, specifically the Ordnance Survey National Grid reference NX.