Flood Risk Maps & Flood Zone Mapping

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Environment Agency flood risk mapping - including Flood Zones 2 & 3.

Flood maps for planning and development - identify flood constraints affecting sites and proposed schemes.

Surface water and river flood risk data - understand potential flood exposure and surrounding flood context.

Suitable for planning applications and flood risk assessments - trusted mapping for environmental and site analysis workflows.

Environment Agency flood risk mapping - including Flood Zones 2 & 3.

Flood maps for planning and development - identify flood constraints affecting sites and proposed schemes.

Surface water and river flood risk data - understand potential flood exposure and surrounding flood context.

Suitable for planning applications and flood risk assessments - trusted mapping for environmental and site analysis workflows.

MapServe provides flood risk mapping using Environment Agency datasets including Flood Zone 2 and Flood Zone 3 across England.

Flood risk maps are widely used to:

support planning applications
identify flood-sensitive development sites
assist flood risk assessments
understand surface water flooding exposure
assess environmental and development constraints
support due diligence and land research

Sector	Need	Why it's used	Typical format
Planning	Identify flood constraints affecting development	Helps determine whether sites fall within Flood Zones 2 or 3 for planning submissions	CAD (DWG & DXF)
Architecture	Understand flood risk before design begins	Supports site appraisal, layout planning and drainage considerations	CAD (DWG & DXF)
Development & Land	Assess site suitability and risk exposure	Identifies flood-sensitive land before acquisition or development	CAD (DWG & DXF)
Environmental Consulting	Support flood risk and environmental assessments	Provides authoritative flood mapping for reports and due diligence	CAD (DWG & DXF)
Property & Conveyancing	Review flood exposure affecting property	Helps assess potential flood issues and surrounding flood context	CAD (DWG & DXF)
Infrastructure & Utilities	Understand flood impacts on assets and routes	Assists infrastructure planning and resilience analysis	CAD (DWG & DXF)

Flood Zone 2 mapping showing land with medium probability of flooding
Flood Zone 3 mapping showing land with high probability of flooding
OS MasterMap® mapping showing buildings, roads, boundaries and site context
Flood risk coverage across England using authoritative environmental datasets

Flood risk mapping supplied using Environment Agency datasets, including Flood Zones 2 & 3.
Environment Agency flood data remains subject to Crown copyright and licensing terms where applicable.
Flood risk layers are provided as professional environmental mapping datasets for authorised use and analysis.

Map product	Best used for	Key limitations
Flood Zones 2 & 3	River and coastal flood risk planning	Does not show all surface water flooding
Surface Water Flood Risk	Identifying rainfall and drainage flooding risk	Does not represent river flood extents
Combined flood risk mapping	Planning, site analysis and flood assessments	Should be used alongside site-specific assessment where required
Environment Agency flood maps	Professional flood risk and environmental workflows	Mapping does not guarantee future flood behaviour

While flood risk maps provide important environmental and planning context, they should not be treated as a substitute for detailed site-specific flood assessment or engineering analysis.

For detailed flood modelling
Flood risk maps show indicative flood extents but do not replace hydraulic modelling or specialist flood studies.
For site-specific drainage design
Additional surveys and drainage assessments may still be required to understand local conditions and runoff behaviour.
Where flood conditions may have changed
Flood risk can change over time due to development, drainage alterations, climate impacts or updated modelling.
For confirming future flood events
Flood maps indicate potential risk areas but cannot predict exactly when or how flooding will occur.
When additional environmental assessment is needed
Some developments may require a formal Flood Risk Assessment (FRA) or supporting environmental reports beyond baseline mapping.

When not to rely solely on flood risk maps

Attribute	Description
Coverage	England
Data sources	Environment Agency Flood Zones 2 & 3
Formats	CAD (DWG & DXF)
Flood types	River flooding, coastal flooding, surface water flooding
Projection	British National Grid
Grid reference system	OSGB36
Mapping extent	Site-specific and surrounding flood context
Data updates	Based on Environment Agency published datasets
Compatible workflows	Planning, environmental and land analysis
Output options	Site maps, flood overlays and layered environmental mapping
Licensing	Environment Agency data subject to applicable licensing and Crown copyright terms

FAQ

What is a flood risk map?

A flood risk map shows areas that may be affected by river, coastal or surface water flooding.

What are Flood Zones 2 and 3?

Flood Zone 2 shows land with a medium probability of flooding, while Flood Zone 3 shows land with a higher probability of flooding.

What is surface water flood risk?

Surface water flood risk mapping identifies areas potentially affected by intense rainfall and drainage overflow where water cannot drain away quickly.

Are flood risk maps used for planning applications?

Yes. Flood risk maps are widely used to support planning applications, flood risk assessments and environmental reports.

Is the data sourced from the Environment Agency?

Yes. The mapping uses Environment Agency flood datasets including Flood Zones 2 & 3.