What is Flood Maps (NI)?

Flood Maps (NI) is an interactive map-viewer that enables users to access the latest flood hazard information available from government.

The purpose of Flood Maps (NI)

It highlights the areas throughout Northern Ireland that are prone to flooding and its potential adverse impacts.  
The map is designed to:

  • help us and others to plan and manage our work to reduce flood risk
  • encourage people living and working in areas prone to flooding to find out more and take appropriate action
  • inform anyone applying for planning permission if flooding is likely to be an important consideration

Viewing the Flood Maps

Please note some users may experience compatibility issues with older browsers when using the viewer. 

Users should ensure pop ups are enabled, this is required for the viewer to function fully.

The history of the Flood Maps

Flood maps were first published by DfI Rivers in November 2008.

This first generation of maps, known as the Strategic Flood Map (NI) Rivers & Sea, was developed to provide an indication of the general areas throughout Northern Ireland that may be prone to flooding from rivers and the sea.

A strategic surface water flood map was subsequently published in December 2011 and the name of the map service was changed to the Strategic Flood Map (NI).

Due to the onerous requirement to produce flood maps that cover the whole of the province, it was necessary to develop the strategic flood models using a broad-scale modelling methodology that had clear limitations.

These limitations meant the estimated floodplain outlines and inundation areas produced using the strategic models were not considered to be sufficiently accurate to determine the flood risk to a particular property or specific point location.

However, the initial objective of the strategic maps was to highlight the general areas and communities that were potentially at risk of flooding and they were entirely suitable for this purpose.

The Strategic Flood Map was used in the Preliminary Flood Risk Assessment for NI (PFRA) which was completed in December 2011 in compliance with the EU Floods Directive.  A key objective of the PFRA was to identify areas of potentially significant flood risk for which detailed flood maps would be produced.

On the basis of the PFRA, it was determined that detailed flood maps should be produced for 20 Significant Flood Risk Areas and 49 Areas for Further Study and this work was completed as required by the EU Directive in December 2013.

In comparison with the strategic flood maps the accuracy and scope of the information illustrated in the detailed maps is greatly improved and most importantly (unlike the strategic maps) is considered suitable for determining the level of risk to individual properties and specific point locations.

The detailed maps for the 69 areas are now hosted within Flood Maps (NI).

For the geographical areas that are not covered by the detailed mapping the strategic flood maps will continue to be displayed within Flood Maps (NI).

If you require any information in relation to the Flood Maps, or if you do not have access to a computer and would like a printed copy of the map for your area, you may contact us by writing to:

DfI Rivers Headquarters
49 Tullywiggan Road,
Co Tyrone
BT80 8SG.
Telephone: 028 8676 8342
Email: rivers.registry@infrastructure-ni.gov.uk

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