Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Plenary 6: Design and Operation 1 - Sewer Inspection
Wednesday, 24/Aug/2022:
3:30pm - 5:00pm

Session Chair: Jes Vollertsen
Location: Lecture Hall BMT

BMTEG138 (HS BMT), Biomedical Engineering Building at Stremayrgasse 16, 8010 Graz, ground floor

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3:30pm - 3:50pm

Defect Assessment of Sewer Pipes Based on CCTV Inspections

Zahra Tizmaghz, Kobus JE van Zyl, Theuns Henning

The University of Auckland, New Zealand


  • Eight categories of defects were identified in 2700 sewer pipes in Auckland, New Zealand based on recent CCTV inspection reports.
  • The correlation between eight defect categories and several physical and environmental factors, including age and groundwater level were investigated.
  • Statistically significant relationships were found between defect categories and factors that provide new insights into the drivers of deterioration processes in sewer pipes.

3:50pm - 4:10pm

Application of the sewer drone in inspection of large sewers and special structures

Andreas Obermayer, Klaus Jilg, Siqi Tong


This article introduces the theory and practical application of sewer drone in inspection of large sewers and special engineering structures. Important parameters about sewer drone regarding optimal flying conditions are given and the procedures of post processing of data collected during drone flghts are described. In addition, possibilities as well as limitations in the use of drone for sewer inspection are discussed. With the rapid advance of technology, it can be anticipated in the near future that more possibilites in drone inspection can be exploited as additional support to the conventional sewer inspection methods.

4:10pm - 4:30pm

A stepwise approach to search for illicit connections in the storm sewers of Berlin: using EC and DTS

Michel Gunkel1, Mathias Riechel2, Daniela Böckmann3, Remy Schilperoort4, Franziska Gehring1, Holger Hoppe3, Nicolas Caradot2, Johan Post4, Jeroen Langeveld4

1Berliner Wasserbetrieb, Germany; 2Kompetenzzentrum Wasser Berlin, Germany; 3Dr. Pecher AG, Germany; 4Partners4UrbanWater, The Netherlands

  • The Berlin Fennsee is suffering from surface water quality issues probably related to illicit connections to storm sewers in the area.
  • In a stepwise approach, a network of electrical conductivity (EC) sensors was first deployed to identify hotspot areas that likely contain illicit connections.
  • In a second step, Distributed Temperature Sensing (DTS) was used in one hotspot area to identify the exact location of an illicit connection with multiple discharges per day.

4:30pm - 4:50pm

Quick 3D scans from the surface for pipeline inspections based on electrical tomography

Pekka Tuominen, Juhani Korkealaakso, Antti Knuuti

Deep Scan Tech, Finland

This pilot project demonstrates the use of a novel 3D scanning technology, based on electric tomography and applied from the surface, for identifying and locating underground sewer leaks. As the scans also reveal different soil types and the position of the pipelines, they can reveal the reasons causing pipeline leaks, such as gradual soil movements. Moreover, the aim is to assess the performance, replicability and scalability of the technology for mapping risk areas in large scale. In this pilot a pipeline of 2.5 km was scanned in varying terrain, including across a creek and under a paved road.