Print Email Facebook Twitter Quantitative impact assessment of sewer condition on health risk Title Quantitative impact assessment of sewer condition on health risk Author van Bijnen, J.A.C. (TU Delft Sanitary Engineering) Korving, J.L. (TU Delft Mathematical Physics; Deltares) Langeveld, J.G. (TU Delft Sanitary Engineering; Partners4UrbanWater) Clemens, F.H.L.R. (TU Delft Sanitary Engineering; Deltares) Date 2018 Abstract Due to a variety of contaminants in floodwater, exposure to urban pluvial flooding may pose a health risk to humans. In-sewer defects may cause increased pluvial flooding, possibly increasing health risks. This paper addresses the impact of in-sewer defects on urban pluvial flooding and, subsequently, on infection probabilities for humans. As such, it provides a necessary input for risk-informed sewer maintenance strategies in order to preserve the hydraulic performance of a sewer system. Critical locations in sewer networks can be safeguarded through detecting changes in hydraulic properties of the sewer system, by using monitoring equipment or alternative inspection methods. Two combined sewer systems in The Netherlands with different characteristics are studied. The catchment-wide average infection probability was calculated using Quantitative Microbial Risk Assessment (QMRA) and flooding frequencies from Monte Carlo simulations with a hydrodynamic model. For the studied catchments, it is concluded that the occurrence of flooding is significantly affected by sediment deposits and, consequently, the infection probability as well. The impact of sediment deposits on infection probabilities depends on sewer systems characteristics and varies within the catchment. The results in this paper also demonstrate that further research on the relationship between flood duration and infection probabilities is required. Subject Health riskHydrodynamic modellingSewer maintenanceUrban drainageOA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:087a01a6-3ba7-4f68-81f9-2f6539313715 DOI https://doi.org/10.3390/w10030245 ISSN 2073-4441 Source Water, 10 (3) Part of collection Institutional Repository Document type journal article Rights © 2018 J.A.C. van Bijnen, J.L. Korving, J.G. Langeveld, F.H.L.R. Clemens Files PDF water_10_00245.pdf 2.18 MB Close viewer /islandora/object/uuid:087a01a6-3ba7-4f68-81f9-2f6539313715/datastream/OBJ/view