(see also under “Project Pages“at woutzweers.nl )

The 1st batch of work includes (Sep ’18-March ’19)

  • Assisted management NobisBV
  • Set up and built website Wetropolis.nl and acts as webmaster, wrote several blog articles
  • Built copy of Leeds Aire River foam models
  • Improved Arduino electronics and code of Leeds model
  • Coded Grasshopper scripts (Rhino3D plugin) to import local topographical information from AHN (Algemene hoogtekaart Nederland) and Open Street Map in Rhino (3D modelling program). Applied this in modelling topography of “Gorssel” model
  • Cooperation with JanJaap Wietsma (Pre-U). Goal-01: Develop hands on model for secundary education in NLT. Product-01: lesbrief and materials for lessons NLT
  • Constructed and evaluated plaster model of Gorssel: milled river model in foam, cast silicon reproduction mold, casted plaster reproductions for evaluation
  • Presentation of Wetropolis (lecture) and Lego model test at Maker Fair Eindhoven 2018

The 2nd batch of work includes (March ’19-June ’19)

  • Assisted management NobisBV
  • Investigated weather quicker, easier material to work with than plaster would be feasible . This resulted in Lego and polystyrene models.
  • Developed, tested and evaluated Lego waterscapes at Maakfestival Twente Enschede 2019, Willemschool Hengelo , Culturele zondag Enschede , Expeditie Next Rotterdam
  • Built LEGO version Galton board, compatible with existing Arduino sketch for Galton Board
  • Used Dino (subsoil) information to make subsoil model and validated this model against available data of “kwelwater”

The 3rd batch of work includes (July 19-Sep ’19)

  • Developed handcut river shape in foam with adjustable hot wire foam cutter (“Zwolle”model) (Goal-01)
  • Experimented with sand in foam models to show sedimentation
  • Started “Enschede” subsoil model made of polystyrene, machined with laser to give it hydraulical characteristics
  • Acts as “opdrachtgever” for students of International Water Technology (Saxion): Fieldlab about prototyping hydrological cases

future plans & work in progress

  • Investigate and evaluate how to visualize groundwater aimed at outreach and education with Design Lab Utwente
  • Copy the Leeds model for use in Netherland as demo, eventually with slightly different “concept geography”
  • Refine Galton board for continuous use, refine Lego version to enable easier construction of the Galton board
  • Make foam model “IJssel” for NLT conference,
  • Develop foam model “Stuwrug Enschede” for interactive, hands-on hydrogeological demo model.
  • Develop digital 3D model of Stuwrug Twente for computational modelling of groundwater.
  • Improve ways of obtaining topograhical data for model making

Stichting Free Flow Foundation

(see also under “Funding” at GitHub )

The 1st batch of work includes (Jan-June 2019, ca. 100hrs)

The Wetropolis flood demonstrator is a conceptual, life installation showcasing what an extreme rainfall event is and how such an event can lead to extreme flooding of a city

  • Establishing GitHub-site such that Wetropolis flood demonstrator design is a) reported & b) can be used by others for modification & inspiration
  • Write-up & submission of scientific article on Wetropolis (outreach & education), presently submitted to HESS, co-authors Bokhove and Zweers
  • Creation of poster for presentation at EGU2019 in Vienna with Bokhove, Kent, Zweers & De Poot
  • Visit to Enschede for communication & knowledge exchange

The 2nd batch of work includes (Aug-2-Oct 2019):

  • Further work on Wetropolis NFM modification & improving Galton boards
  • Work with Wainfleet Flood Action Group, invitation & report
  • Visit to Enschede for communication & knowledge exchange with Wout Zweers (Wowlab) & JanJaap Wietsma (UTwente)
  • Attendance at 2 Wetropolis-EU-Efro meetings via Skype
  • Management EU-EfroFuture plans

Future plans:

  • Making groundwater Wetropolis concerning groundwater below Enschede?
  • Promoting & refining Galton boards further
  • Further mathematical & numerical modelling


work (Sept ’19 – Juni ’19)

  • Built working prototype of the AR sandbox by UC Davis – https://arsandbox.ucdavis.edu/
  • Built improved AR sandbox installation based on first hand experience / observations in the field
  • Developed and built additional ‘rain-buttons’ for the AR sandbox, hidden functionality of the software is now available with physical buttons during runtime
  • Experimented with object detection with Kinect 3D depth camera, in combination with sand
  • Investigated conceptual ideas for interactive modelling of groundwater (digital / physical)

Future work in progress (after Oct ’19)

  • Porting AR sandbox source code to Unity (3D game engine / C#)
  • Improving visuals AR sandbox (Unity): height lines, water flow, etc.
  • Adding (game) scenarios to AR sandbox software (Unity)
  • Researching object recognition with Pixy2 camera
  • Implementing object recognition in cooperation with University of Twente students

Saxion University of Applied Sciences

Planning Wetropolis research group Smart Cities, Saxion

The terms between brackets at the end of each task description refer to the different phases in the Design Thinking process.


  • User studies: preparing format for focus groups with citizens (Empathise)
  • User studies: executing first focus group with citizens (Empathise)

Future work , to be done in the coming years:

  • User studies: executing several focus groups with citizens (Empathise)
  • User studies: preparing format for focus groups and interviews with professionals (Empathise)
  • User studies: executing focus groups and interviews with professionals (Empathise)
  • User studies: analysing qualitative data from user studies (Define)
  • 3D-models: developing mock-up 3D-model based on previous user studies (Ideate)
  • User studies: Focus group (brainstorm) based on mock-up to come up with additional functionality/requirements (Ideate)
  • User studies: reporting on user studies in the form of requirements for Wetropolis 3D-models (Define) 
  • 3D-models: preparing roles in data collection for citizens and companies/governmental organisations (both high-tech and low-tech ways of collecting data) (Prototype)
  • 3D-models: organising and technically enabling the collection of data from citizens and companies/governmental organisations in a data platform (Prototype)
  • 3D-models: visualising the data from citizens and professional citizens and companies/governmental organisations in 3D models (Prototype)


Tetem is actively developing workshops for children around Water & Wetropolis (Goal-3) including:

  • establishing teaching concepts, source-books on water, a Maker’s Lab, Rapid Prototyping and maps (Sept ’18 to June ’19, all in progress)
  • as well as planning of pilots at schools