AfA480: 2004 Fluvial Flood Depth Change Under Climate Scenarios

A 2004 Environment Agency dataset models the difference in flood depth caused by a 20% increase in peak river flows, a specific climate change scenario. It was generated using the JFlow hydrodynamic model on a 5x5 meter grid to fill gaps in detailed local flood data for spatial planning. The data covers specific 100x100km Ordnance Survey grid squares across England for both 1% and 0.1% annual flood probabilities.

Use Cases

• Strategic flood zone definition for spatial planning based on modelled depth differences.
• High-level assessment of climate change impact on fluvial flood depths for regional studies.
• Comparison of baseline and climate-adjusted flood scenarios using a 5x5m resolution grid.

Strengths

• Provides a consistent, England-wide modelled baseline from a specific 2004 project using the JFlow hydrodynamic model.
• Offers high-resolution geospatial data on a standardized 5x5 meter grid.
• Contains data for two distinct flood probabilities (1% and 0.1% annual chance), allowing for scenario comparison.

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 size, row count, license, and specific column names is consistently missing across all platform entries.
• Explicitly not suitable for property-level assessment, detailed decision-making, or site-specific flood risk evaluations.

Provenance

Source

Environment Agency (UK)

Collection Method

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

Time Range

2004

Freshness

2026-07-06 07:13:30.908137

Geography

Specific 100x100km Ordnance Survey National Grid squares (e.g., TA, TF, TG, TL, TQ, TR, TV) across England.