Fathom-Global 2.0 Flood Hazard Data

A step-change in your ability to understand global flood hazard

Introduction Fathom-Global 2.0 provides flood hazard data from the cutting edge of academic research. This model is unique in harnessing world-leading modelling techniques, combined with the very latest terrain and hydrography data.

Product key features


90 meter resolution globally

*30 meter available on request.


100% of river channels explicitly modelled


10 Return periods – From 1:5 year to 1:1000 year. Return periods can be categorised to suit your risk appetite.


A high‐resolution global flood hazard modelWater Resources Research, 2015


Fluvial & pluvial floodingAssess the behaviour of multiple flood types


Defended & undefended layers – Compare the impact of modelled flood defences

About the model Fathom-Global represents the most robust and comprehensive global flood hazard dataset in the world.

Fathom’s latest Global data use MERIT-DEM and MERIT-Hydro, the best terrain and hydrography data currently available globally. These data provide the most accurate view of the ground surface elevation and the location of all rivers. These two components are crucial in building robust flood models.

By coupling the latest topography and hydrography datasets with cutting-edge hydraulic modelling techniques, Fathom have produced truly world-leading flood data for the whole planet. All methods have been published in the most pre-eminent scientific journals, representing a step change in our ability to understand flooding at the global scale.

Fathom-Global simulates inundation across all rivers in the world using a 2D hydraulic modelling framework. 

The most important component of any global flood model is the terrain data. When building earlier models, terrain data contained errors. These errors made it very difficult to build accurate flood models. As our ability to model flood has advanced, so have the terrain datasets made available to the global community.

Fathom-Global 2.0 enables:


Quantification and mitigation of flood risk.


Consistent analysis and pricing of global exposures.


Competitive advantage for risk selection, pricing and underwriting.


Improved portfolio management at a global scale.


Triage your flood exposures across any portfolio.


Loss analysis by flood types.


Output can be categorised to reflect your risk appetite.

Model Evolution Fathom-Global 2.0 compared to Fathom-Global 1.0:

    01 Fathom-Global 1.0

    Fathom model output built using previous iteration of global terrain data. Floodplain topography and small flow pathways were poorly defined in some areas.

    02 Fathom-Global 2.0

    Fathom model output built using the latest MERIT DEM terrain datset. The model featured a number of significant updates including:

    – improved representation of river channels
    – the ability to produce plausible event footprints.

    Fathom provided a first-rate product and service based upon cutting-edge research and methodologies, which are both robust and transparent. Their flood data sets are global, consistent and high calibre. Most importantly, Fathom-Global is a responsive and collaborative firm who consistently deliver.


    Fathom’s flood hazard and risk data products are critical to assessing risks to Microsoft’s cloud infrastructure. In this way, their data impacts the delivery of services relied on by the 400 million global users of Office 365, Outlook.com and OneDrive, and the 48 million members of Xbox.


    Having data from Fathom provided the rapid assessment team confidence in the damage numbers being reported on the ground. Normally running models is time-consuming, however, if available quickly and at a reasonable cost, this type of data is extremely useful.

    Related Insight Read More
    The latest research underpinning the new Fathom-Global 2.0 model

    Want to learn more about Fathom’s global model?