Accounting - Theses
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ItemMitigation of urban floods through the permeabilization of Melbourne’s large surfaces: The effects of green infrastructure on urban flooding under different scenarios in the Elizabeth Street catchment.( 2022)Water-sensitive urban design (WSUD) is an alternative to traditional drainage to better manage stormwater in highly urbanised areas, especially in the context of climate change. Often referred to as nature-based solutions, they help reduce runoff volumes through surfaces that mimic the hydrological process of retention and filtration. Although multiple types of WSUD exist, this research mainly shows the potential benefit of implementing green roofs and permeable pavements to minimise urban flood risk, as they are easily installed on unused surfaces such as rooftops and streetcar parks. Therefore, this thesis aims to explore the relationship between green roofs and permeable pavements for flood reduction using as a case study the Elizabeth Street catchment (ESC) in Melbourne, which is the most flood-prone area in the city. The impact of these systems during flooding was studied using Geographic Information Systems (GIS) and rainfall-runoff simulations using IBER software to compare the flows and depths produced by a design storm under different modelling scenarios where the number of green roofs and porous pavements over the catchment surface were varied. At the same time, water management policies implemented in the study area were analysed to determine whether they promote the installation of green roofs and permeable pavements. The research found that implementing green roofs and permeable pavements at the urban scale depends on the level of integration in public policies. The results showed that there are 672,284 m2 of potential roofs and 98,517 m2 of on-street parking spaces in the ESC that can be intervened to help reduce the runoff volume following a rainfall event. The results showed that these strategies could help reduce runoff volume by 20%. On the other hand, it was found that the City of Melbourne's policies related to water management do not greatly promote the implementation of green roofs and permeable pavements, which is reflected in the limited number of these strategies encouraged in relevant policies.