Fathom’s UK Flood Map, Fathom-UK, offers an alternative view of flood risk against existing government data, projecting changes in hazard across multiple different climate scenarios. Achieved through combining world-leading research and cutting edge modeling techniques with data like UKCP18, UK Flood Map offers users to critically assess the impact of flood risk against any portfolio, book of business or asset.
Product key features
5 climate scenarios across 3 time horizons – Utilizing UKCP18 climate data to produce scenarios for present day, 2030, 2050 and 2070.
10 return periods
Ranging from 1:5 year to 1:1000 year. Return periods can be categorised to suit your risk appetite.
Unique detection algorithm that identifies flood defenses where data are not available.
Inland and coastal flooding
Fluvial, pluvial and coastal flooding – Assess the risk from different types of flood including defended and undefended views
Gain instant on-demand access via the Fathom API and Fathom Portal, host the data on-premise
~10 meter resolution
About the map Created by some of the world’s leading academics and scientists in climate risk and hydrology, Fathom’s UK Flood Map is based on pioneering methods developed in-house
Underpinned by decades of peer-reviewed research, our model couples decades of scientific research with the latest hydraulic modeling techniques.
The result is flood hazard data that can provide high-resolution predictions for current and future climate scenarios – a first for flood modeling in the UK.
By integrating these datasets into Fathom’s hydraulic modeling framework, UK Flood Map yields multiple return periods for every river channel in the country.
We have achieved this through Fathom’s unique channel solver methodology, which explicitly represent river channels in the absence of accurate hydrographic information.
When incorporated alongside precise terrain data, multiple perils and defense algorithms, users are presented with a dataset that effectively represents the impact of climate on flood risk, rather than relying solely on historical records.
Model features Model features
Pluvial flood For pluvial perils, Fathom’s UK Flood Map accounts for drainage systems, flash flooding and infiltration across a variety of terrain
Flooding simulated for even the smallest flow pathways.
Extreme precipitation magnitudes using data from UK Centre for Ecology and Hydrology (CEH).
Channel drainage is explicitly represented.
Fluvial flood When modelling fluvial, Fathom-UK accurately represents extreme river flows at any point for every UK river.
Flows based on the entire NRFA gauge record.
Multiple return periods.
Comprehensive defence representation.
Coastal flood We account for multiple coastal scenarios including sea level rise, high tides and storm surge.
100% coverage of the United Kingdom’s coast.
Extreme water level scenarios taken from the Environment Agency
Tide gauge data and wave setup estimates based on ECMWF.
Research and validation Research and validation
01 Climate change is altering the way that we experience events
The UK Flood Map helps to quantify UK flood risk and asset exposure for 5 climate scenarios, across 3 time horizons. This is the first flood model in the UK to factor in the impact of climate change, rather than just relying solely on historic records. By doing so, Fathom takes the UK’s understanding of flood risk one step further and supports users to understand how risk will change over time.
With new regulations requiring insurers, corporations, and risk managers to understand flood risk in the future better, our model provides accurate predictions for pluvial, fluvial, and coastal perils. Fathom-UK’s inclusion of 10 return periods means users have access to a comprehensive collection of event frequencies.
The hydraulic model projects changing flood behaviour arising from UKCP18.