Selecting rainfall events for effective Water Sensitive Urban Design (WSUD) implementation

Liu, An, Guan, Yuntao, Egodawatta, Prasanna, & Goonetilleke, Ashantha (2013) Selecting rainfall events for effective Water Sensitive Urban Design (WSUD) implementation. In Proceedings of the 16th International Conference on Diffuse Pollution and Eutrophication, International Water Association, Beijing, China.

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The current approach for protecting the receiving water environment from urban stormwater pollution is the adoption of structural measures commonly referred to as Water Sensitive Urban Design (WSUD). The treatment efficiency of WSUD measures closely depends on the design of the specific treatment units. As stormwater quality can be influenced by rainfall characteristics, the selection of appropriate rainfall events for treatment design is essential to ensure the effectiveness of WSUD systems. Based on extensive field investigation of four urban residential catchments and computer modelling, this paper details a technically robust approach for the selection of rainfall events for stormwater treatment design using a three-component model. The modelling outcomes indicate that selecting smaller average recurrence interval (ARI) events with high intensity-short duration as the threshold for the treatment system design is the most feasible since these events cumulatively generate a major portion of the annual pollutant load compared to the other types of rainfall events, despite producing a relatively smaller runoff volume. This implies that designs based on small and more frequent rainfall events rather than larger rainfall events would be appropriate in the context of efficiency in treatment performance, cost-effectiveness and possible savings in land area needed.

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ID Code: 63407
Item Type: Conference Paper
Refereed: No
Keywords: Multivariate analysis, Stormwater quality, Stormwater quantity, Water Sensitive Urban Design, WSUD, Stormwater pollutant processes
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Water Quality Engineering (090508)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 International Water Association
Deposited On: 16 Oct 2013 06:10
Last Modified: 08 Aug 2014 18:01

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