Risk of Flooding from Surface Water Direction at 25m Resolution

Environment Agency data shows the dominant flow direction of surface water flooding with a 1% annual chance. This GIS layer is resampled to a 25-meter grid and grouped into eight compass directions. The dataset is part of the superseded Risk of Flooding from Surface Water mapping and is not suitable for property-level assessment.

Use Cases

• Modeling regional surface water flood flow based on dominant direction bands.
• Assessing broad-scale flood hazard for strategic planning based on indicative flow maps.
• Integrating flood flow direction into larger environmental risk models based on the 25m grid.

Strengths

• Data is derived from a high-resolution 2m source grid.
• Flow direction is categorized into eight distinct compass bands.
• Produced by the UK Environment Agency with contributions from CEH, Defra, and other authoritative bodies.

Limitations

• The record has been retired and superseded by a newer version.
• The dataset is explicitly not suitable for identifying flooding at individual property level.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

Environment Agency

Collection Method

Resampled from a 2m grid as part of the Risk of Flooding from Surface Water (RoFSW) mapping.

Freshness

Last updated 2026-07-06 07:17:21.387096; freshness should be verified.

Geography

United Kingdom