The following resources provided the main basis for identifying the flood areas:
- digital terrain models – ATKIS DTM1 (Geoportal Berlin / ATKIS® DTM – Digital Terrain Model),
- 100-year flood water levels (IWU 2015, IWU 2014, IPS 2013, IPS 2009 and Koenzen et al. 2011),
- Gauge readings over time, and,
- Gewässerkarte (Map of Bodies of Water) (Geoportal Berlin / Gewässerkarte, as of May 1, 2017).
For a more detailed definition of the statistical base, please refer to the studies in Table 1.