Abstract
As a consequence of climate change, the impact of pluvial flooding is expected to increase in the next decades. Despite citizens’ poor knowledge, several types of stormwater infrastructure can be implemented to mitigate the impact of future events. This paper focuses on the implementation of green and grey stormwater interventions (i.e., with or without vegetation) on private properties. Framed by the Protection Motivation Theory, a survey-based case study analysis, carried out in a pluvial flooding-prone area of the Veneto Region (Italy), highlights the main factors driving people’s willingness to implement these interventions. The analysis shows that the implementation of grey stormwater infrastructures is driven by the perceived threat and the amount of past pluvial flooding damage (i.e., the direct experience as a proxy of prior knowledge) while the implementation of green stormwater infrastructures is driven also by additional factors (awareness of these interventions, age and education level of the citizens). Based on these results, lack of knowledge on innovative stormwater interventions represents a critical barrier to their implementation on private properties, and it confirms the need for specific dissemination and information activities.
Highlights
Due to changes in the world’s climate, hydrogeological disasters have become more frequent and severe [1,2], with an increase in the frequency of episodes of heavy rainfall [3], causing pluvial flooding, i.e., the saturation of drainage systems resulting in floods, even in the absence of a river or a lake
GreySIs with respect to the baseline, only two variables significantly affect it: the threat appraisal factor and the prior knowledge factor, i.e., direct damage to the property caused by pluvial floods in the last 10 years
This paper has investigated the main drivers of the implementation of both GreySIs and GreenSIs on private properties, by carrying out a survey-based case study analysis in a pluvial flooding-prone area of the Veneto Region, under the framework of the Protection Motivation Theory (PMT)
Summary
Due to changes in the world’s climate, hydrogeological disasters have become more frequent and severe [1,2], with an increase in the frequency of episodes of heavy rainfall [3], causing pluvial flooding, i.e., the saturation of drainage systems resulting in floods, even in the absence of a river or a lake. Pluvial flooding does not cause catastrophic damage over wide areas; rather, it usually leads to severe, albeit very localized, damage (e.g., limited to a single neighbourhood of a city) To cope with this risk, stormwater infrastructures have been demonstrated to be effective in reducing the risk of pluvial flooding in urban areas, and they are generally classified into green and. Urban drainage has largely evolved: multiple objectives (e.g., additional water supply, increasing biodiversity, improving microclimate) drive the design of drainage infrastructures and the decision-making process [12] This evolution leads towards the use of solutions based on natural processes and ecosystems, in order to solve both hydraulic issues and other types of societal and environmental challenges [9], in the context of climate change. Stormwater infrastructures include all those interventions that reduce the pluvial flooding risk of an urban area
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