The maximum size of areas used for sewage farms is depicted. Only areas specially prepared for sewage treatment use are included. The sewage farms are divided in 20 sewage farm districts, following the system of the Berlin Waterworks. The period of use is given next to the name of each site. Not all sections were used from the beginning of operations, or during the entire time-span of operations.
Areas prepared for waste treatment were supplemented with another 11,000 ha bought by Berlin in the course of establishing the sewage farms. These areas were intended for expansion of operations, but were never prepared or used for treatment. These areas are depicted on various overview maps, but are not considered here.
Sewage farms still in operation in the vicinity of Berlin are differentiated into two types: treatment of waste water cleaned mechanically in sedimentation tanks; and treatment of waste water cleaned mechanically and biologically in clarification plants.
Closed sewage farms are portrayed with the date of discontinuance. A differentiation of five time periods for closures can be made on the basis of available map materials.
Locations of sludge sedimentation basins and sludge drying areas are not depicted to scale. Locations given are according to information from the 60’s. Only locations established later at the Karolinenhöhe sewage farms were supplemented. The intensive filtration areas are also given.
Some areas of closed sewage farms continued to be used. These areas of continued use are depicted. They were usually used in the operations of sewage treatment plants associated with them. The kind of use is characterized by colors or given in the description of the area. Among them are abandoned or currently used clarification plant sludge storage areas and clarification plant sludge composting areas. The former sewage farm Münchehofe supplied clarification sludge for fertilization of agricultural areas until 1985. The material was driven by clarification water through a pipeline. Fining ponds were established in some areas as settling tanks for follow-up purification of clarification plant outflows. Iron-manganese sludge resulting from drinking water preparation was also stored.