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Department of Spatial Planning

TransMiT - Resource Optimisation of Mixed and Separating Drainage in Existing Urban Districts with Intensive Settlement Pressure

Project duration: 04/2019 to 08/2022

The scientific objective of this project is to illustrate and assess, how aspects of urban development can be combined with aspects of water development in consideration of resource efficiency. Therefore, three typical urban districts will be analysed by using different research approaches. Its focus is on the transforming aspects of the technical and organisational transformation of separating and mixed drainage.

The increased number of sealed surfaces and the more frequent heavy rain events occurring due to climate change can be a burden on existing sewage systems due to higher peaks when water runs off. In the course of that regulatory requirements have been exacerbated in the last few years. The scientific objective of the subproject at the Technical University of Dortmund is the scientific study of retention capacity of (flat) roofs. The analysis of the suitability and eligibility of (flat) roofs contain discharge measurements, the scientific monitoring and the evaluation of the results. In the final step this knowledge should be transferred to other urban districts.

Further information

Bundesministerium für Bildung und Forschung (BMBF)

More details about the project

Funding code 033W105

Partner Agencies:

Research institutes

  • Institut für Siedlungswasserwirtschaft und Abfalltechnik (ISAH)
  • Institut für Siedlungswasserwirtschaft der TU Braunschweig (ISWW)
  • Institut für Infrastruktur und Ressourcenmanagement (IIRM)
  • Institut für Kartographie und Geoinformatik (ikg)

Municipal departments

  • Stadtentwässerung Hannover, Eigenbetrieb der Landeshauptstadt Hannover (SEH)
  • Landeshauptstadt Hannover, Fachbereich Umwelt und Stadtgrün (LHH – FB 67.10)
  • Stadtentwässerung Hildesheim (SEHi)
  • Stadtentwässerung Braunschweig GmbH (SEBS)

Local actors

  • Wohnungsgenossenschaft Gartenheim eG (GH)
  • Spar- und Bauverein eG (spar + bau)


  • bpi Hannover
  • aquaplaner Ingenieurgesellschaft für Wasserwirtschaft, Umwelt, Abwasser
  • plan zwei Stadtplanung und Architektur