Author(s): Fabian Funke; Stefan Reinstaller; Manfred Kleidorfer
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Abstract: Urban drainage infrastructures are exposed to a variety of external influencing factors that can negatively affect hydraulic performance and increase the risk of flooding. This includes changing precipitation characteristics due to climate change (Hosseinzadehtalaei et al., 2020), an increase in impermeable surfaces due to advancing urbanization (Tscheikner-Gratl et al., 2019) but also other failures and malfunctions (Mugume et al. 2015) in the technical grey and green infrastructure. With an increasing share of sustainable urban drainage systems (SUDS) and uncertainties regarding responsibility, care and maintenance of these facilities (Lashford et al., 2019), as well as progressive aging of conventional sewers that are inspected and maintained too infrequently, an increase in malfunctions can be assumed. In this work, we are investigating common malfunctions in urban drainage systems using a 1D/2D urban flood model of a small Austrian municipality (10,000 inhabitants). The goal is to quantify the impact of failures and malfunctions in both grey and blue-green infrastructures on flooding areas for different rainfall events and compare them to other possible scenarios like climate change.
Year: 2022