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Water 2018, 10(3), 245; https://doi.org/10.3390/w10030245

Quantitative Impact Assessment of Sewer Condition on Health Risk

1
Department of Water management, Faculty of Civil Engineering and Geo Sciences, Delft University of Technology, P.O. Box 5048, Delft 2600 GA, The Netherlands
2
Deltares, P.O. Box 177, Delft 2600 MH, The Netherlands
3
Delft Institute of Applied Mathematics, Delft University of Technology, P.O. Box 5031, Delft 2600 GA, The Netherlands
4
Partners4UrbanWater, Javastraat 104a, Nijmegen 6524 MJ, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 20 February 2018 / Accepted: 21 February 2018 / Published: 28 February 2018
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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. View Full-Text
Keywords: hydrodynamic modelling; health risk; urban drainage; sewer maintenance hydrodynamic modelling; health risk; urban drainage; sewer maintenance
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van Bijnen, M.; Korving, H.; Langeveld, J.; Clemens, F. Quantitative Impact Assessment of Sewer Condition on Health Risk. Water 2018, 10, 245.

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