Flood Map for Planning: Areas Benefiting from Defences in England

Environment Agency data shows areas in England that benefit from flood defences for a 1% annual chance river flood or 0.5% annual chance sea flood. This dataset was retired on November 2, 2022, and superseded by the 'Reduction in Risk of Flooding from Rivers and Sea due to Defences' dataset. The mapping assumes defences act perfectly and aligns with Flood Zone 3 criteria from Planning Practice Guidance.

Use Cases

• Assess land suitability for development based on flood defence benefits mentioned in the description.
• Model residual flood risk in areas with defences for emergency planning scenarios.
• Compare protected areas against different flood probability standards (e.g., 1-in-100 vs 1-in-1000).

Strengths

• Based on specific flood probability standards (1% annual chance for rivers, 0.5% for sea).
• Explicitly maps the benefit of defences for Flood Zone 3 planning criteria.
• Linked to a related dataset ('Risk of Flooding from Rivers and Sea') for contextual risk understanding.

Limitations

• Dataset is retired and was last updated on 02/11/2022; users should seek the superseding dataset.
• Does not show all areas benefiting from all flood defences, focusing on a specific protection standard.
• Mapping assumes flood defences act perfectly, which may not reflect real-world conditions.

Provenance

Source

Environment Agency (UK), with spatial data from Centre for Ecology & Hydrology and Ordnance Survey.

Collection Method

Modelling of flood extents with and without the presence of defences.

Time Range

Assessment date unknown; dataset retired in 2022.

Freshness

Retired; last updated 02/11/2022.

Geography

England (implied from Environment Agency jurisdiction).