AfA480: 2004 Fluvial Flood Depth Climate Change Difference Grid

A 5x5m resolution geospatial grid shows the difference in modelled fluvial flood depths between baseline conditions and a 2004 climate change scenario with a 20% increase in peak flows. This dataset was produced for the 0.1% annual chance flood event using the JFlow hydrodynamic model to fill gaps in detailed local data for spatial planning. It covers specific 100x100km Ordnance Survey grid squares (NU, SW) within England but has not been updated since its creation.

Use Cases

• Assessing potential changes in flood inundation extent for strategic spatial planning based on a 2004 climate scenario.
• Providing a historical baseline for comparing the evolution of climate change modeling in flood risk management.
• Identifying areas where generalized modeling was applied in 2004, indicating a potential need for more recent local detailed studies.

Strengths

• Provides a specific, high-resolution (5x5m) spatial comparison of flood depths under two modeled conditions.
• Covers a defined, low-probability (0.1% annual chance) flood event scenario critical for planning.
• Explicitly documents the modeling methodology (JFlow 2D hydrodynamic model) and climate change parameter (20% peak flow increase).

Limitations

• The dataset is outdated, created in 2004 and not updated since; official climate change allowances have since changed.
• Metadata is incomplete across platforms, with no information on row count, file size, license, or specific column names.
• Explicitly not suitable for property-level assessment, detailed decision-making, or site-specific flood risk assessments.

Provenance

Source

Environment Agency (UK)

Collection Method

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

Time Range

2004

Freshness

Last metadata update recorded as 2026-07-06, but the underlying data is from 2004 and is stated as not updated.

Geography

Covers specific 100x100km Ordnance Survey National Grid squares (references NU and SW mentioned) within England.