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GLOBAL DIGITAL FLOOD MAPS

City: Hamburg, Germany
DOUBLE MATERIALITY ASSESSMENT
Floods disrupt power grids, water supplies, roads, and railroads, reducing labor availability and causing significant economic losses for municipalities and companies. These impacts ripple through supply chains, delaying global production. All these factors should be incorporated into double materiality assessments, addressing social, environmental and financial consequences. Read more ...
WTN METHODOLOGY
Flood depth is the best metric for impact assessment, yet climate and weather models don't provide it. WTN bridges this gap by reconstructing flood depth from river runoff and precipitation, using observations and climate models. WTN delivers global flood data at 30-meter resolution, leveraging a high-precision Digital Elevation Model. Read more ...
FLOOD PROBABILITY & RETURN PERIOD
The return period is the most common measure for rare events like floods. A 100-year return period means a 1% chance (0.01 probability) of occurring in any year. A 1-meter flood with 0.01 probability poses extreme risk, causing significant physical damage. Read more ...
RAW DATA SOURCES
Inundation modeling uses daily records of wind, temperature, and precipitation from 1950 to today (and projections to 2100). Historical data comes from ERA5-land, NASA, and ESA, while forward-looking analysis relies on advanced climate models from the CMIP6 run. Read more ...