Heavy Rainfall and Urban Flooding Hazards 2026

All data sources used are listed below:

• HWK_SRG (Advisory Map of Heavy Rainfall Hazards): © BKG (2025) dl-de/by-2-0, data sources: sgx.geodatenzentrum.de/web_public/gdz/datenquellen/datenquellen_hwk_srg.pdf (only available in German)
• Topographic depression analysis of the BWB, 2022 (provided on 21 February 2022; BWB 2022, unpublished)
• Fire service operations during rain, 2007 to 2017 (provided on 1 November 2023; BWB 2023, unpublished)
• Fire service operations during rain, 2018 to 2021 (provided on 1 November 2023; BWB 2023, unpublished)
• Urban and Environmental Information System (ISU5), 2021 – Changes to ISU areas (SenStadt 2021)
• Flood Hazard Map for Floods with Low Probability, 2024 (SenStadt 2024)
• Map of Bodies of Water, as of 24 May 2023 (Geoportal Berlin)

• ATKIS® DGM (DTM – Digital Terrain Model)
• ALKIS® Official Real Estate Cadastre Information System
• Rainwater and wastewater sewer network models (BWB)
• Data on charges (BWB)
• Drainage master plan (GEP), (BWB)
• Road drains
• Green Roofs
• Aerial photographs (orthophotos)
• Soil-scientific characteristic values
• Road survey
• Fire service operations and Flood Atlas
• Heavy precipitation statistics (KOSTRA) of Germany’s National Meteorological Service (DWD)

Please note, it is not possible to specify the dates for the individual datasets, as the most recent data was used at the time of compilation. For detailed information, please refer to the individual reports (cf. Table 1).