UK Surface Water Flood Flow Direction at 0.1% Annual Chance

Environment Agency mapping shows the dominant flow direction of surface water flooding with a 0.1% annual probability, based on a 2-meter grid. This dataset is part of the superseded Risk of Flooding from Surface Water (RoFSW) mapping, previously known as the uFMfSW Complex Package. The record has been retired and is not suitable for property-level assessment.

Use Cases

• Modeling regional surface water flood propagation based on dominant flow direction bands.
• Strategic land-use planning to avoid high-flow flood pathways mentioned in the description.
• Integrating with other flood risk layers for a composite hazard assessment, as suggested by its grouping within the uFMfSW Complex Package.

Strengths

• Based on a detailed 2-meter resolution grid for spatial analysis.
• Flow directions are categorized into 8 compass bands for simplified modeling.
• Produced by the UK Environment Agency with contributions from recognized institutions like the Centre for Ecology & Hydrology.

Limitations

• The dataset has been retired and superseded by a newer version, indicating it is not the current authoritative source.
• Explicitly stated as not suitable for identifying flooding at individual property levels.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

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

Collection Method

Likely generated from hydrological modeling of surface water flow.

Freshness

Last updated 2026-07-06 07:17:23.388405; freshness should be verified as the record is retired.

Geography

United Kingdom