Fluvial Flood Depth Model for England, 2004 Generalised Project

Modelled fluvial flood depth data was created for the 1% annual chance of flooding situation as a by-product from the 2004 generalised modelling project. The Environment Agency produced this data using the JFlow two-dimensional hydrodynamic model on a 5x5m grid to fill gaps where no detailed local modelled data existed. This dataset covers the Ordnance Survey National Grid reference SU, a 100x100km square area within England.

Use Cases

• Define flood zone extents for spatial planning based on the 1% annual chance flood depth model.
• Assess broad catchment-scale flood risk based on the 2004 generalised hydrodynamic modeling.
• Support Shoreline Management Plan scale studies based on the 5x5m grid flood depth data.
• Identify areas requiring more detailed local flood modeling based on the generalised data gaps.

Strengths

• Data is modeled on a 5x5m grid, providing a specific spatial resolution.
• Created for the specific 1% annual chance of flooding situation.
• Covers a defined 100x100km square area (grid reference SU) within England.

Limitations

• The dataset has not been updated since its creation in 2004.
• 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.

Time Range

Modeled data created in 2004.

Geography

Ordnance Survey National Grid reference SU (a 100x100km square area) within England.