• During week 38 (18-22 september) 2023, Aalborg University will organize a PhD course on sewer processes. Registration is free, but the number of participants are limited to 20. Update 31-08-2023: Unfortunantely, the course has to be cancelled in 2023. 
  • The 10th International Conference on Sewer Processes & Networks was held in august 2022 in Graz, Austria. See details at the conference webpage www.spn10.com. The organizer for the next SPN conference will be nominated in spring 2023.

Sewer Systems & Processes Working Group

This Working Group was formed in 1997 under the umbrella of The International Water Association (IWA) and The International Association for Hydraulic Research (IAHR) Joint Committee on Urban Drainage (link), as a group with activities regarding physical, chemical and biological aspects of sewers.

Objectives and Scope

To disseminate information about sewer systems, in particular to coordinate research and development activities relating to physical aspects (structure and layout), physical processes (hydraulics and transport of solids), chemical and microbial processes (pollutant occurrence, transformations and interactions), and interactions where appropriate with sources and destinations such as environment (via overflows) and treatment plants. Activities will relate to system design, operation, rehabilitation/renovation, maintenance and control, and will overlap to some extent with IWA specialist groups. However, the group will act as a focus for (in-sewer) process activities. See also the SS&PWG statutes.

Contact information



Univ.-Prof. Dr.-Ing. Dirk Muschalla.
Graz University of Technology, Institute of Urban Water Management, Stremayrgasse 10/I, 8010 Graz, Austria. Phone: +43-(0)316-873-8370, Email: d.muschalla@tugraz.at

Vice-chair/ Chair of next SPN conference:

To be nominated during spring 2023.


Dr Asbjørn Haaning Nielsen,

Department of the Built Environment, Aalborg University, Thomas Manns Vej 23, DK-9220 Aalborg Ø, Denmark, Phone: +45 2787 9817, E-mail: ahn@build.aau.dk