Introduction

The Strategic Flood Map (Surface Water) map service is a multi layered predictive flood mapping product providing a strategic overview of areas across Northern Ireland that could be affected by surface water flooding. The Strategic Flood Map (Surface Water) includes the following layers of information for present day epoch: • Floods with a medium probability

Purpose of the data

The dataset has been designed to raise awareness among the public, Government Departments, local authorities and other organisations of the likelihood of surface water flooding, thus supporting a more proactive and co-operative approach to flood risk management. By being aware of the land estimated to be at risk of flooding, authorities can develop strategies to better manage flood risk through their planning, flood prevention, and emergency planning functions.

Data Coverage

All of Northern Ireland, with some limited coverage in Republic of Ireland in border areas.

Data Format

OGC (Open Geospatial Consortium) compliant Web Mapping Service in WGS 1984 projection, accessible via secure website (requires authentication by user specific username and password).

Data content

Strategic Surface Water Floodplain (Present Day) o Medium Probability (1 in 200 year rainfall event)

Introduction

The Strategic Flood Map (Rivers) map service is a multi layered predictive flood mapping product providing a strategic overview of areas across Northern Ireland that could be affected by river flooding. The Strategic Flood Map (Rivers) includes the following layers of information for both present day and climate change epochs: • Floods with a medium probability

Purpose of the data

The dataset has been designed to raise awareness among the public, Government Departments, local authorities and other organisations of the likelihood of river flooding, thus supporting a more proactive and co-operative approach to flood risk management. By being aware of the land estimated to be at risk of flooding, authorities can develop strategies to better manage flood risk through their planning, flood prevention, and emergency planning functions.

Data Coverage

All of Northern Ireland, with some limited coverage in Republic of Ireland in border areas.

Data Format

OGC (Open Geospatial Consortium) compliant Web Mapping Service in WGS 1984 projection, accessible via secure website (requires authentication by user specific username and password).

Data content

Strategic River Floodplain o Rivers (Modelled/Unmodelled) Strategic River Floodplain (Present Day) o Medium Probability Floods (1% AEP) Strategic River Floodplain (Climate Change 2030) o Medium Probability Floods (1% AEP)

AEP is Annual Exceedance Probability e.g. the 1% AEP flood extent shows areas of land with an annual probability of flooding of 1% (or 1 in 100 chance) in any year.

Companion Mapping Services

• Strategic Flood Map (Coastal) • Strategic Flood Map (Surface Water) • Historical Flood Map