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| HAL : hal-00663958, version 1 |
| DOI : 10.1080/15732479.2010.541265 |
| Fiche détaillée |  Récupérer au format |
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| Structure and Infrastructure Engineering (2011) 1-15 |
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| The consistency of visual sewer inspection data |
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| J. Dirksen 1, 2F.H.L.R. Clemens 1, 3 |
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| (02/2011) |
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| In common with most infrastructure systems, sewers are often inspected visually. Currently, the results from these inspections inform decisions for significant investments regarding sewer rehabilitation or replacement. In practice, the quality of the data and its analysis are not questioned although psychological research indicates that, as a consequence of the use of subjective analysis of the collected images, errors are inevitable. This article assesses the quality of the analysis of visual sewer inspection data by analysing data reproducibility; three types of capabilities to subjectively assess data are distinguished: the recognition of defects, the description of defects according to a prescribed coding system and the interpretation of sewer inspection reports. The introduced uncertainty is studied using three types of data: inspector examination results of sewer inspection courses, data gathered in day-to-day practice, and the results of repetitive interpretation of the inspection results. After a thorough analysis of the data it can be concluded that for all cases visual sewer inspection data proved poorly reproducible. For the recognition of defects, it was found that the probability of a false positive is in the order of a few percent, the probability of a false negative is in the order of 25%. |
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| 1 : | Department of Civil Engineering and Geosciences |
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Delft University of Technology |
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| 2 : | Waternet |
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Amsterdam, The Netherlands |
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| 3 : | Witteveen + Bos Consulting Engineers |
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Deventer, The Netherlands |
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| 4 : | Laboratoire de Génie Civil et d'Ingénierie Environnementale (LGCIE) |
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Institut National des Sciences Appliquées (INSA) - Lyon |
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| 5 : | Institute of Sanitary Engineering and Water Pollution Control |
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University of Natural Resources and Life Science, Vienna, Austria |
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| 6 : | Research Institute for Water and Waste Management |
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RWTH Aachen University, Aachen, Germany |
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| 7 : | Snaterse Civiele Techniek & Management |
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Ermelo, The Netherlands |
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| Domaine | : | Sciences de l'environnement/Ingénierie de l'environnement |
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| sewer inspection – reproducibility – uncertainty |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00663958, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00663958 | |
| oai:hal.archives-ouvertes.fr:hal-00663958 | |
| Contributeur : Frédéric Cherqui | |
| Soumis le : Vendredi 27 Juillet 2012, 07:00:02 | |
| Dernière modification le : Vendredi 27 Juillet 2012, 07:00:02 | |
