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

Modelled fluvial flood depth data was produced for England in 2004 using the JFlow hydrodynamic model on a 5x5m grid. The dataset covers the Ordnance Survey National Grid reference SO and represents flood depths for a 0.1% annual chance event. It was created by the Environment Agency as a by-product of a generalised modeling project to fill gaps in detailed local data for spatial planning.

Use Cases

• Assessing historical flood risk extents for spatial planning based on the 2004 generalised modeling project.
• Comparing generalised 2004 flood depths with more recent local detailed models mentioned in the description.
• Supporting broad catchment-scale flood risk studies based on the 5x5m grid resolution.
• Analyzing flood zone definitions for the SO grid reference area based on the modelled depth data.

Strengths

• Data was produced using a two-dimensional hydrodynamic model (JFlow) on a 5x5m grid.
• The dataset covers a specific 100x100km Ordnance Survey National Grid reference (SO).
• It was created for a defined purpose: filling gaps in detailed local modelled data in 2004.

Limitations

• The dataset has not been updated since 2004 and may be superseded by more recent local modeling.
• The description explicitly states it is not suitable for identifying whether an individual property will flood or for detailed decision making.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

Environment Agency

Collection Method

Modelled using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Geography

England, specifically the Ordnance Survey National Grid reference SO.