2004 Fluvial Flood Depth Climate Change Difference Grid for England

2004 data provides a 5x5m resolution grid showing the difference in modelled fluvial flood depths between baseline conditions and a climate change scenario with a 20% increase in peak flows. It was generated using the JFlow hydrodynamic model as part of a generalised modelling project to define Flood Zones for spatial planning in areas lacking detailed local data. The dataset covers specific 100x100km Ordnance Survey grid tiles (e.g., SS, SK, ST, SY) across England for a 0.1% annual chance flood event.

Use Cases

• Assessing potential changes in flood depth due to climate change for strategic land-use planning based on modelled depth differences.
• Identifying areas where generalised flood zone mapping from 2004 may be affected by climate change assumptions.
• Providing a historical baseline for comparing against more recent, detailed local flood modelling studies.

Strengths

• Provides a consistent, England-wide modelled comparison for a specific climate change scenario from 2004.
• Offers high spatial detail on a standardized 5x5m grid, derived from a named hydrodynamic model (JFlow).

Limitations

• The dataset has not been updated since its creation in 2004, and climate change allowances have since changed, limiting its current accuracy.
• Metadata for key attributes like row count, specific license, and author is consistently missing or listed as 'None' across all platform entries.
• Explicitly not suitable for property-level assessment or detailed site-specific decision-making, restricting its application.

Provenance

Source

Environment Agency (UK)

Collection Method

Generated using the JFlow two-dimensional hydrodynamic model as a by-product of the 2004 generalised modelling project.

Time Range

2004

Freshness

Last updated metadata dates are from July 2026, but these refer to platform records; the underlying data is from 2004 and is stated as not updated.

Geography

England, specifically for 100x100km Ordnance Survey National Grid tiles (e.g., SS, SK, ST, SY).