2004 Fluvial Flood Depth Climate Change Difference Grids for England

Modelled fluvial flood depth difference data shows the change in flood depth under a 2004 climate change scenario of a 20% increase in peak flows. The data is a by-product of the 2004 generalised modelling project, created using the JFlow hydrodynamic model on a 5x5m grid for 0.1% and 1% annual flood chance scenarios. It was designed to fill gaps in detailed local data to define Flood Zones for spatial planning across England, but the dataset has not been updated since its creation.

Use Cases

• High-level flood zone definition for spatial planning based on modelled depth differences.
• Regional climate change impact assessment for fluvial flooding using a 20% peak flow increase scenario.
• Comparison of baseline and climate-adjusted flood depths from the 2004 generalised modelling project.

Strengths

• Provides high-resolution (5x5m grid) modelled data for a consistent national-scale analysis.
• Based on a specific, documented climate change scenario (20% increase in peak flows) from 2004.
• Created using a named hydrodynamic model (JFlow) as part of a formal government project (AfA480).

Limitations

• The dataset is outdated (2004) and climate change allowances have since changed, limiting its accuracy for current assessments.
• Metadata for specific tiles (e.g., size, row count, license) is consistently missing across all platform entries.
• Explicitly not suitable for site-specific flood risk assessments or property-level decision-making.

Provenance

Source

Environment Agency (UK)

Collection Method

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

Time Range

2004

Freshness

2026-07-06 (metadata update date, but underlying data is from 2004 and not updated)

Geography

England, provided in 100x100km Ordnance Survey National Grid tiles (e.g., TF, TQ, TA, TG, TL, TR, TM).