Flood

We work with all key flood data providers in the market to provide you with a choice of data sets to suit your organisation's perils models.

Read on to learn more about all of our flood data sets or click on a specific data provider below to find out more.

JBA Comprehensive Flood Hazard Map

JBA Repulic of Ireland Flood Map

JBA Northern Ireland

Ambiental UK and Northern Ireland

EA Risk of Flooding from Rivers and Sea

Environment Agency Flood Alerts

Environment Agency Historic Flood Layer

Name	JBA Comprehensive Flood Hazard Map
Data Source	JBA Risk Management
Theme	Flooding
Update Frequency	Yearly
Description	The CFM is made up of six flood layers: River (undefended and defended areas), Coastal (defended), Surface Water, Groundwater, Dam Break and Canal Failure. The river flood map comprises flood mapping for 120,000km of rivers across Great Britain for the following annual exceedance probabilities (AEP): 5% (1 in 20 years) 1.3% (1 in 75 years) 1% (1 in 100 years) 0.5% (1 in 200 years) 0.1% (1 in 1,000 years). The River mapping comprises both flood extents and banded depth grids. The coastal flood mapping shows the estimated extent of flooding from the sea around the coastline of England, Wales and Scotland. Flood extents and banded depth data. 75, 200, 1000 years. Surface water – the susceptibility of flooding from heavy rainfall. Flood extents and banded depth data. 75, 200, 1000 years. Ground water – areas where flooding is possible from both chalk and alluvial aquifers. The Dam Break Flood Map shows the indicative flood extent following an instantaneous catastrophic breach of selected dams or reservoirs. Canal failure mapping includes two types of failure: (1) breach of raised canal embankments, (2) Aqueduct failure
Coverage	Great Britain

Name	JBA Republic of Ireland Flood Map
Data Source	JBA Risk Management
Theme	Flooding
Update Frequency	Yearly
Description	The CFM comprises four flood layers: undefended river, river defended, undefended coastal and surface water. The river flood mapping shows the estimated floodplain boundaries for approximately 30,000km of river network across Ireland for the following annual exceedance probabilities (return periods) of flooding: 20, 75, 100, 200, 1000 years The coastal mapping shows the effects of extreme sea level flooding around the coastline of Ireland for the same return periods as above. The surface water mapping shows the hazard from flooding by heavy rainfall across Ireland for the 0.5% (1 in 200 years) annual exceedance probability of flooding. The mapping comprises both flood extents and banded depth data. The Dam Break Flood Map shows the indicative flood extent following an instantaneous breach of selected reservoirs.
Coverage	Republic of Ireland

Name	JBA Northern Ireland
Data Source	JBA Risk Management
Theme	Flooding
Update Frequency	Yearly
Description	The river flood mapping represents flood scenarios for rivers across Northern Ireland. The coastal mapping represents the estimated extent of flooding from the sea around the coastline. Both are generated for the following AEPs: 1.3% (1 in 75 years) 1% (1 in 100 years) 0.5% (1 in 200 years) 0.1% (1 in 1,000 years) The surface water mapping represents the hazard from flooding due to heavy rainfall across Northern Ireland for the following AEPs: 1.3% (1 in 75 years) 0.5% (1 in 200 years) 0.1% (1 in 1,000 years) River, coastal and surface water flood mapping comprises both flood extents and banded depth data.
Coverage	Northern Ireland

Name	Ambiental UK and Northern Ireland
Data Source	Ambiental
Theme	Flooding
Update Frequency	Annual/After Major Events
Description	Provides accurate flood risk information for the UK, providing flood depth and velocity information for individual buildings. Resolution: 2-5 metres UKFloodMap4™ uses one of the highest resolution topographic information. Wherever possible, it uses LiDAR data, which is vertically accurate to ±15cm. It also incorporates the most up-to-date river flow and rainfall data available (CEH March 2014), has a range of return periods, and covers all the main sources of flooding, including rivers, tidal and surface water. Contained within the Ambiental data set is FloodScore AAL Risk Rating Layers which enable you to visualise property-level AAL based flood risk ratings, and integrate them with your GIS systems for advanced flood risk assessment.
Coverage	Great Britain

Name	EA Risk of Flooding from Rivers and Sea
Data Source	Environment Agency (EA)
Theme	Flooding
Update Frequency	Yearly
Description	The 'Risk of Flooding from Rivers and Sea' dataset provides an indication of flood risk by calculating the actual likelihood of flooding to areas of land within flood plains from an extreme flood (1 in 1000 or 0.1% chance in any given year). Within this area, land is categorised as being of low (1 in 200 chance or less), moderate (1 in 75 to 1 in 200 chance) or significant (more than 1 in 75 chance) risk of flooding from rivers or the sea in any given year. The model provides a broad assessment of the likelihood of flood risk to a site by predicting the likelihood that the centre of a 50m cell will be flooded. The method considers a number of different flood scenarios, including a change in the distance from a given area to a river or the sea and the probability that flood defences fail. The product is constantly being developed and updated with improved terrain data, and local knowledge and the current condition of flood defences.
Coverage	England, Wales

Name	Environment Agency Flood Alerts
Data Source	Environment Agency (EA)
Theme	Flooding
Update Frequency	Once or twice per day
Description	Flood Alert Areas are geographical areas where it is possible for flooding to occur from rivers sea and in some locations groundwater. A single Flood Alert Area may cover the floodplain within the Flood Warning Service Limit of multiple catchments of similar characteristics containing a number of Flood Warning Areas. A Flood Alert Area may also match that of a corresponding Flood Warning Area and warn for the possibility of flooding in that area. In some coastal locations a Flood Alert may be issued for spray or overtopping and be defined by a stretch of coastline. A Flood Alert is issued to warn people of the possibility of flooding and encourage them to be alert stay vigilant and make early / low impact preparations for flooding. Flood Alerts are issued earlier than Flood Warnings to provide advance notice of the possibility of flooding and may be issued when there is less confidence that flooding will occur in a Food Warning Area. Flood Warning are provided by the constant monitoring of stations and forecasting flooding from rivers or the sea: Severe Flood Warning: Severe flooding. Danger to life. Flood Warning: Flooding is expected. Immediate action required. Flood Alert: Flooding is possible. Be prepared.
Coverage	England, Wales

Name	Environment Agency Historic Flood Layer
Data Source	Environment Agency (EA)
Theme	Flooding
Update Frequency	Quarterly
Description	Historic Flood Map is a GIS layer showing the maximum extent of all individual Recorded Flood Outlines from river, the sea and groundwater springs, and shows areas of land that have previously been subject to flooding in England. The Historic Flood Map will take into account the presence of defenses, structures, and other infrastructure where they existed at the time of flooding. It will include flood extents that may have been affected by overtopping, breaches or blockages. Flooding shown to the land and does not necessarily indicate that properties were flooded internally.
Coverage	England, Wales

Name	Flood RE
Data Source	Flood RE
Theme	Flooding
Update Frequency	Quarterly
Description	Home insurance only. Flood Re is a reinsurance company, which means it enables insurance companies to insure themselves against losses because of flooding. Unlike other reinsurance companies it is a not-for-profit fund, owned and managed by the insurance industry. Customers will still buy their insurance from insurers or insurance brokers in the usual way, they will not deal directly with Flood Re. When the cost of the flood risk part of their policy climbs above a certain level, it may make sense for the insurer to place that part of the policy with Flood Re. In the case of a customer making a claim because of a flood they will have their claim managed and repair works completed by their insurer in the usual way, but that insurer will then be able to recover those costs from Flood Re. Contains address fields, UPRN, strike claim count, resilience indicator, exclusion indicator, eligibility history.
Coverage	Great Britain