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Abstract
Operation and maintenance of the public sewer system represent key tasks for an operator. Condition assessment is usually conducted by conventional closed circuit television (CCTV) inspection. However, alternative tools such as manhole-zoom cameras (MZCs) and the acoustic technology SewerBatt® are available today. The INNOKANIS project investigates structural and operational condition assessment in the sewer system by means of three MZC models and SewerBatt® to develop a combined optical and acoustic device as a cost-effective alternative to conventional CCTV inspection. The first field trials of the ongoing project were conducted in Austria in 2011. 640 conditions according to EN 13508-2/A1 were investigated and compared against conventional CCTV reports. Individual and combined detection rates for both devices were calculated. Based on the current findings, both MZC and SewerBatt® are effective alternatives to conventional CCTV inspection. In addition, performance is significantly enhanced when both devices are used in combination.
Acknowledgements
The authors would like to thank the MZC companies iPEK International GmbH, MesSen Nord GmbH and Ritec GmbH as well as the sewer operators RHV Trumerseen, RHV Wolfgangsee-Ischl and AWV Anzbach-Laabental for their support and assistance with the project. Further thanks go to IBAK Helmut Hunger GmbH & Co. KG and MTA Messtechnik GmbH (European Pipeline Center).