Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Urban Flooding Management: the Turin Metropolitan Area Case Study (North-Western Italy)

These authors contributed equally to this work.
Version 1 : Received: 4 May 2023 / Approved: 6 May 2023 / Online: 6 May 2023 (07:55:26 CEST)

How to cite: Cremonini, R.; Tiranti, D.; Bechini, R.; Graziadei, M.; Burzio, E.; Scibetta, M.; Brussolo, E. Urban Flooding Management: the Turin Metropolitan Area Case Study (North-Western Italy). Preprints 2023, 2023050388. https://doi.org/10.20944/preprints202305.0388.v1 Cremonini, R.; Tiranti, D.; Bechini, R.; Graziadei, M.; Burzio, E.; Scibetta, M.; Brussolo, E. Urban Flooding Management: the Turin Metropolitan Area Case Study (North-Western Italy). Preprints 2023, 2023050388. https://doi.org/10.20944/preprints202305.0388.v1

Abstract

The effects of global warming combined with the progressive expansion of urbanization have considerably increased exposure to urban flooding and runoff widespread erosion risk, also causing shallow landslides and mud flows, respectively in urbanized areas of lowland and hill/foothill environments. Increasing urban flooding resilience has become a priority at virtually all levels of governance. The analysis of a different hazard scenarios, in which various hydro-meteorological conditions and management alternatives are examined, should act as the basis for the effective design and evaluation of interventions to improve urban flooding resilience. Turin Metropolitan Area (TMA), located in north-western Italy, represents a unique case due to its complex orography, with a mountainous sector in the west side and a flat or hilly part in the east side. During the warm season, these environmental conditions make the urban area prone to severe atmospheric convection causing frequent hailstorms and rainstorms of high intensity that may impact on urban infrastructures (i.e., drainage system and road network), thus requiring an adequate management as a key factor to reducing risk and losses. The urban areas of TMA are monitored by polarimetric Doppler weather radars and by a dense rain gauges network. Analyzing several case studies of urban flooding, this research work assesses the feasibility of a meteorological radar early warning system based on the identification of rainfall thresholds that characterize urban flooding, occurring in the lowlands, and the runoff erosion phenomena affecting the urbanized hills and foothills.

Keywords

rainfall thresholds; rainstorms; runoff erosion; weather radar; early warning system; risk reduction; resilience

Subject

Environmental and Earth Sciences, Other

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