Influence of Rainfall and Catchment Characteristics on Urban Stormwater Quality

Liu, An, Egodawatta, Prasanna, Guan, Yuntao, & Goonetilleke, Ashantha (2013) Influence of Rainfall and Catchment Characteristics on Urban Stormwater Quality. Science of the Total Environment, 444, pp. 255-262.

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Abstract

The accuracy and reliability of urban stormwater quality modelling outcomes are important for stormwater management decision making. The commonly adopted approach where only a limited number of factors are used to predict urban stormwater quality may not adequately represent the complexity of the quality response to a rainfall event or site-to-site differences to support efficient treatment design. This paper discusses an investigation into the influence of rainfall and catchment characteristics on urban stormwater quality in order to investigate the potential areas for errors in current stormwater quality modelling practices. It was found that the influence of rainfall characteristics on pollutant wash-off is step-wise based on specific thresholds. This means that a modelling approach where the wash-off process is predicted as a continuous function of rainfall intensity and duration is not appropriate. Additionally, other than conventional catchment characteristics, namely, land use and impervious surface fraction, other catchment characteristics such as impervious area layout, urban form and site specific characteristics have an important influence on both, pollutant build-up and wash-off processes. Finally, the use of solids as a surrogate to estimate other pollutant species was found to be inappropriate. Individually considering build-up and wash-off processes for each pollutant species should be the preferred option.

Impact and interest:

20 citations in Scopus
19 citations in Web of Science®
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131 since deposited on 10 Jan 2013
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ID Code: 56177
Item Type: Journal Article
Refereed: Yes
Keywords: Urban stormwater quality, Water quality modelling, Rainfall characteristics, Catchment characteristics, Modelling errors
DOI: 10.1016/j.scitotenv.2012.11.053
ISSN: 0048-9697
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 > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment, [VOL 444, (2013)] DOI 10.1016/j.scitotenv.2012.11.053
Deposited On: 10 Jan 2013 01:24
Last Modified: 22 Jun 2017 18:37

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