The sewerage network maps of the BWB provided the primary base to ascertain the type of drainage as well as the catchment areas of rainwater drainage:
- Data on waste water, combined water and rainwater drains (Drainage network map, as of May 2017) including the pressurized sewage pipes (ADL, as of January 2018) of the Berlin Waterworks (BWB 2017),
- Catchment areas of the Berlin Waterworks (as of May 2017) (BWB 2017a),
- Land use data of the Urban and Environmental Information System (as of December 2015) (cf. Environmental Atlas 06.01, 06.02, SenStadtUm 2016) and
- Impervious soil coverage data, as of May 2016 (cf. Environmental Atlas 01.02, SenStadtWohn 2017).
With the aid of the current digital statistical base dated between 2015 and 2018, the frequently updated data on “Management of Rainwater and Waste Water” of block and block segment areas, first developed as part of the Environmental Atlas in 1992, last revised in 2011; has now, once again, been updated.