Material Flow Analysis of the public space of the Municipality of Leiden

Project information

Period: januari 2020

Client: Municipality of Leiden

Contact person at TAUW: 

  • Sabine de Haes
  • Rianne van der Veen

Project description

The municipality of Leiden would like their built environment to become circular in 2050, and 50% circular in 2030. They want to start by focusing on their direct public space and infrastructure, since they have a lot of influence on how that is built and maintained by procurement. To reveal the most important points of focus, TAUW identified and quantified all the building materials flowing in- and out of the municipality.

Cooperation during this project

During the data collection phase, Tauw collaborated mainly with the data experts and the asset managers within the municipality. Whenever there were data gaps (for example about material content of some bridges that would be demolished) TAUW made estimations and discussed them with the experts. This way we could still make a Leiden specific MFA.


The result: a visualization of building materials for each domain (bridges, roads, street furniture, etc), identification of hot spots, and a list of opportunities to create a more circular system. We made the report in such a way that each domain got its own overview of the visualisations, hot spots and opportunities, so that they could use it as a means to start talking together about a circular economy. Right now, as a follow-up, we are doing a second project with the municipality where we build a roadmap for circular procurement in online creative sessions together with all domains.


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