Fathom-US

Fathom-US

The complete & comprehensive
picture of US
flood exposure.

Fathom-US is the only peer-reviewed, large-scale flood model to be validated against the entire FEMA flood hazard catalogue. For anybody seeking to understand US flood exposure, Fathom-US provides the complete picture.
Fathom-US delivers the latest flood research together with the newest terrain and defences datasets.

With new channel bathymetry and discharge models, Fathom-US provides the most advanced view of flood risk available.

Fathom-US has been validated it against observations of real events, the models of the Iowa Flood Center and USGS, as well as the entire FEMA catalogue.
10
m
resolution
Fathom-US enables:
Complete, detailed understanding of flood risk across the whole US.
Accurate comparison to FEMA flood maps at property level.
Advanced competitive analysis for private flood insurance.
Detailed flood risk and exposure analysis using the latest datasets and flood science.
Substantial competitive advantage for risk selection and pricing.
Improved understanding of claims and loss drivers.
Most up to date understanding of US flood risk.
100
%
river channels
All river channels, from large rivers to small streams, are explicitly represented.
10
return periods
From 1:5 year to 1:1000 year.
Return periods can be categorised to suit your risk appetite.
Fluvial &
pluvial
flooding
Total representation of
rainfall-driven flooding.
FEMA capture major rivers only.
Fathom capture all river channels.
US levee
data
included
The most comprehensive flood defence dataset available.
Press
Cool Green Science
New Study Shows Flood Risks Across the U.S. are Underestimated
(in a Big Way)
Read
Press
Science Daily
Flood risk from American rivers
is greatly underestimated
Read
Fathom identified 41M US citizens are exposed to 100 year flood, compared to the FEMA figure of 13M.
Fathom-US was validated against the entire FEMA flood hazard catalogue, identifying that current FEMA data misses around three quarters of total flood exposure nationwide.
Fathom
calculation
41M
US population exposed to 100 year flood.
Blue -
Fathom 100 year
flood zone
Red -
Exposed population
FEMA
‍calculation
13M
US population exposed to 100 year flood.
Blue -
FEMA 100 year
flood zone
Red -
Exposed population
10
m
resolution
Academic validation
Read Paper
Validation of Fathom-US flood hazard model
Water Resources Research, 2017
Testimonial
// Fathom’s powerful models are uniquely able to support our work evaluating potential nature-based solutions at large scales.//
Dr Kris Johnson
Associate Director for Science and Planning,
The Nature Conservancy