Journal
SUSTAINABLE CITIES AND SOCIETY
Volume 75, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scs.2021.103294
Keywords
Precipitation Uncertainty; Planning and Building Regulations; Runoff Modelling; Low Impact Development; Sustainable Urban Planning
Categories
Funding
- Senate Research Committee (SRC) Grant, University of Moratuwa, Sri Lanka [SRC/LT/2020/28]
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The research evaluated the effectiveness of planning and building regulations in managing urban flooding under different precipitation scenarios. Plot coverage regulations were found effective during average rainfall events, while LID-based infrastructure solutions performed well during moderate rainfall events. However, none of these solutions were adequate during extreme rainfall events. Practitioners favored the adoption of green roofs and plot coverage regulations for managing more frequent average rainfall events and maintaining the balance of urban hydrological pathways.
This research evaluates the effectiveness of planning and building regulations in coping with urban flooding under different precipitation scenarios. Accordingly, the study simulated seven alternative scenarios considering the variations of precipitation, plot coverage regulations, and Low Impact Development (LID) options. The study utilized open-source geospatial software to model different surface runoff scenarios. Then the effectiveness of those seven alternatives was assessed by utilizing the Analytical Hierarchy Process (AHP) technique to evaluate their sustainability in urban design. The results revealed that the plot coverage regulations are effective in managing floods during average rainfall events, and LID-based infrastructure solutions are effective during moderate rainfall events. Nevertheless, none of these solutions were solely adequate during extreme rainfall events. Regardless of the response to extreme rainfall occurrences, the practitioners' opinion was in favour of green roof adoption and plot coverage regulation considering their effectiveness in managing more frequent average rainfall events, and the overall sustainability in maintaining the balance of urban hydrological pathways. Accordingly, the findings of the study can be utilized as a guide to the decision-making process in urban planning and design, and to formulate sustainable planning regulations and guidelines to cope with urban flooding under the precipitation uncertainty.
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