In response to the catastrophic July 2021 flooding that caused severe damage and loss of life in Rhineland-Palatinate and North Rhine-Westphalia, Germany launched a national initiative to strengthen its flood preparedness and climate resilience. The Federal Agency for Cartography and Geodesy (BKG) provided authoritative one-metre resolution Digital Terrain Models (DTMs) and land cover datasets to support hydraulic modelling for heavy rainfall scenarios. These DTMs, harmonised from federal states into nationwide coverage, accurately reveal underlying topography by removing vegetation, infrastructure, and manmade obstructions, enabling precise simulations of flood dynamics. In parallel, CORINE Land Cover data, provided through the Copernicus Land Monitoring Service, enriched the models by accounting for soil, land use, and urbanisation patterns. The Copernicus EMS Risk and Recovery Standard was activated by the Federal Office of Civil Protection and Disaster Assistance (BBK) to retrospectively assess the 2021 flood event and feed into long-term disaster management. Integrating elevation, land cover, and meteorological datasets from DWD, the models produced heavy rainfall hazard maps for two scenarios: (1) a rare centennial event, and (2) an extreme scenario simulating rainfall intensity of 90 mm/hour. These maps, hosted on Germany’s central geoportal (www.geoportal.de), provide public, user-friendly access to hazard information, supporting local municipalities, emergency responders, infrastructure planners, and the public.