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Preprint
Impact of Climate Change on Water-Sensitive Urban Design Performances on Mitigating Urban Flooding in the Wet Tropical Queensland Sub-Catchment
Preprints.org, Vol.1 July 2025
MDPI AG
2025
Abstract
Coastal cities are vulnerable to climate change and associated hydrometeorological hazards such as flooding. Existing drainage systems have limited capacity to mitigate future climate change-induced flooding problems effectively. However, some studies have evaluated the effectiveness of integrating water-sensitive urban design (WSUD) with existing drainage systems in mitigating flooding in tropical regions. This study assesses the performance of drainage systems and integrated WSUD options under current and future climate scenarios in a sub-catchment of Saltwater Creek, a tropical catchment located in Cairns, Australia. A combination of 1-dimensional (1D) and 2-dimensional (1D2D) runoff generation and routing models (RORB, storm injector and MIKE+) is used for simulating runoff and inundation. Several types of WSUD are tested alongside different climate change scenarios to assess the impact of WSUD in flood mitigation. The results indicate that the existing grey infrastructure is insufficient to address the anticipated increase in precipitation intensity and the resulting flooding caused by climate change in the Engineers Park sub-catchment. Moderate rainfall events contributed to a 25% increase in peak flow and total runoff volume under the representative concentration pathway 8.5 in 2090 scenario. Integrating WSUD with existing grey infrastructure positively contributed to reducing the flooding problem. However, the efficiency of these combined systems is governed by several factors such as rainfall characteristics, climate change scenario, rain barrel and porous pavement systems, and the size and physical characteristics of the study area. Overall, in the tropics, the flooding problem is estimated to increase under future climatic conditions, and the integration of WSUD with grey infrastructure can play a positive role in reducing floods and their impacts.
Details
- Title
- Impact of Climate Change on Water-Sensitive Urban Design Performances on Mitigating Urban Flooding in the Wet Tropical Queensland Sub-Catchment
- Authors
- Sher Bahadur Gurung - James Cook UniversityRobert J Wasson - James Cook UniversityMichael I Bird - James Cook UniversityBen Jarihani - University of the Sunshine Coast, Queensland, School of Science, Technology and Engineering
- Publication details
- Preprints.org, Vol.1 July 2025
- Publisher
- MDPI AG
- Date published
- 2025
- DOI
- 10.20944/preprints202507.0114.v1
- ISSN
- 2310-287X
- Copyright note
- © 2025 by the author(s). Distributed under a Creative Commons CC BY license.
- Data Availability
- The field data used in this study are available from the corresponding author upon request.
- Grant note
- The authors gratefully acknowledge the support of James Cook University for providing funding through the International Research Training Program (IRTPS) for this research. Additionally, the authors would like to acknowledge the Cairns Regional Council (PD23041 Saltwater Creek Flood Mitigation Project) and the Queensland Government Department of Environment and Science for funding this project. Furthermore, the authors would also like to thank the Hunter Research Grant for providing the additional funds to purchase the software tools.
- Organisation Unit
- School of Science, Technology and Engineering; Sustainability Research Cluster
- Language
- English
- Record Identifier
- 991155038902621
- Output Type
- Preprint
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