The following were used to determine the type of drainage and the catchment areas of the rainwater drainage systems:
- Data on waste water, combined water and rainwater drains (Drainage network map) including the pressurised sewage pipes (ADL) of the Berlin Waterworks, as of December 2022 (BWB 2022),
- Catchment areas of the drainage system of the Berlin Waterworks, as of October 2022 (BWB 2022a),
- Type of drainage of road areas, analysis by the Berlin Waterworks, as of October 2022 (BWB 2022b),
- Urban and Environmental Information System (ISU5) – spatial reference 2020, as of Decemeber 31, 2020 (SenSBW 2022),
- Actual Use of Built-up Areas / Inventory of Green and Open Spaces 2020, as of December 31, 2020 (cf. Environmental Atlas 06.01, 06.02 SenSBW 2020a) and
- Impervious soil coverage data, as of June 2021 (cf. Environmental Atlas 01.02, SenSWB 2021).
The Environmental Atlas data on the “Management of Rainwater and Waste Water” of block and block segment areas was already compiled in 1992 and has been updated several times since then.The current 2022 version includes a separate evaluation of the road areas for the first time.