Fluvial Flood Depth Difference Under Climate Change for England, 2004

5-meter resolution grid data shows the difference in modelled flood depths between baseline and a 20% peak flow increase scenario for a 1% annual flood chance. The Environment Agency produced this dataset in 2004 using the JFlow hydrodynamic model to fill gaps in detailed local flood modelling. It covers a 100x100 km Ordnance Survey grid square (ST) within England, but has not been updated since its creation.

Use Cases

• High-level regional flood risk comparison based on modelled depth differences.
• Assessing potential climate change impacts on flood zones for strategic planning based on the 20% flow increase scenario.
• Visualizing spatial patterns of flood depth change using the 5x5 meter grid structure.

Strengths

• Data is modelled on a high-resolution 5x5 meter grid.
• Explicitly compares two scenarios: baseline fluvial flooding and a defined climate change condition (20% peak flow increase).
• Covers a large, standardized 100x100 km national grid square.

Limitations

• Dataset is from 2004 and has not been updated; climate change allowances have since changed.
• The description warns it is not suitable for identifying individual property flood risk or for detailed site-specific assessments.
• Row count, file formats, and column-level documentation are unknown.

Provenance

Source

Environment Agency (UK), with spatial data licensed from the Centre for Ecology & Hydrology and others.

Collection Method

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

Time Range

2004

Freshness

Last updated date is unknown; data is from 2004.

Geography

Covers the Ordnance Survey National Grid reference ST (a 100x100 km square within England).