Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-205
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
19 Jun 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Flood Impacts on a Water Distribution Network
Chiara Arrighi1, Fabio Tarani2, Enrico Vicario2, and Fabio Castelli1 1Università di Firenze, DICEA (Department of Civil and Environmental Engineering)
2Università di Firenze, DINFO (Department of Information Engineering)
Abstract. Floods cause damage to people, buildings and infrastructures. Due to their usual location near rivers, water utilities are particularly exposed; in case of flood, the inundation of the facility can damage equipment and cause power outages. Such impact leads to costly repairs, disruptions of service, hazardous situations for personnel and public health advisories. In this work, we present an analysis of direct and indirect damages of a drinking water supply system considering the hazard of a riverine flooding as well as the exposure and vulnerability of the system components (i.e. pipes, junctions, lifting stations etc.). The method is based on the combination of a flood model and an EPANET-based piping network model implementing Pressure-Driven Demand, which is more appropriate when modeling water distribution networks with many off-line nodes. The two models are linked by a semi-automated GIS procedure. The evaluation of flood impact on the aqueduct network is carried out for flood scenarios with assigned recurrence intervals. Vulnerable elements exposed to the flood are identified and analyzed in order to determine their residual functionality and simulate failure scenarios. Impact metrics are defined to measure service outage and potential pipe contamination. The method is applied to the water supply system of the city of Florence (Italy), serving approximately 385 000 inhabitants. Results show that for the worst failure scenario 420 km of pipeworks would require flushing and disinfection with an estimated cost of 21 Mio €, which is about 0.5 % of the direct flood losses evaluated for buildings and contents.

Citation: Arrighi, C., Tarani, F., Vicario, E., and Castelli, F.: Flood Impacts on a Water Distribution Network, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-205, in review, 2017.
Chiara Arrighi et al.
Chiara Arrighi et al.
Chiara Arrighi et al.

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Short summary
Floods cause damage to people, buildings and infrastructures. Due to their usual location near rivers, water utilities are particularly exposed; in case of flood, the inundation of the facility can damage equipment and cause power outages. Such impact lead to costly repairs, disruption of service, hazardous situations for personnel and public health advisories. In this work a method to estimate the impact of floods on a water distribution system is introduced and applied to a case study.
Floods cause damage to people, buildings and infrastructures. Due to their usual location near...
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