Journal article

Evaluation of uncertainties in sewer condition assessment

Nicolas Caradot, Pascale Rouault, Francois Clemens, Frederic Cherqui

STRUCTURE AND INFRASTRUCTURE ENGINEERING | TAYLOR & FRANCIS LTD | Published : 2018

Abstract

Closed Circuit Television Inspection is used since decades as industry standard for sewer system inspection and structural performance evaluation. In current practice, inspection data are helpful to support asset management decisions. However, the quality and uncertainty of sewer condition assessment is rarely questioned. This article presents a methodology to determine the probability to underestimate, overestimate or accurately estimate the real condition of a pipe using visual inspection. The approach is based on the analysis of double inspections of the same sewer pipes and has been tested using the extensive data-set of the city of Braunschweig in Germany. Results indicate that the prob..

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Grants

Funding Acknowledgements

The presented work was carried out using data provided by the sewer operator of the city of Braunschweig (SE vertical bar BS) in the frame of the KWB research project SEMA sponsored by Veolia. The authors would like to thank SE vertical bar BS and especially Andreas Hartmann and Michael Timm for supporting the project and providing the data.