Relationships between rainfall intensity, duration and suspended particle washoff from an urban road surface

Article

Brodie, Ian M. and Egodawatta, Prasanna. 2011. "Relationships between rainfall intensity, duration and suspended particle washoff from an urban road surface." Hydrology Research: an international journal. 42 (4), pp. 239-249. https://doi.org/10.2166/nh.2011.117
Article Title

Relationships between rainfall intensity, duration and suspended particle washoff from an urban road surface

ERA Journal ID3538
Article CategoryArticle
AuthorsBrodie, Ian M. (Author) and Egodawatta, Prasanna (Author)
Journal TitleHydrology Research: an international journal
Journal Citation42 (4), pp. 239-249
Number of Pages11
Year2011
Place of PublicationLondon, England
ISSN0029-1277
1998-9563
Digital Object Identifier (DOI)https://doi.org/10.2166/nh.2011.117
Web Address (URL)http://www.iwaponline.com/nh/042/nh0420239.htm
Abstract

A basic understanding of the relationships between rainfall intensity, duration of rainfall and the amount of suspended particles in stormwater runoff generated from road surfaces has been gained mainly from past washoff experiments using rainfall simulators. Simulated rainfall was generally applied at constant intensities, whereas rainfall temporal patterns during actual storms are typically highly variable. This paper discusses a rationale for the application of the constant-intensity washoff concepts to actual storm event runoff. The rationale is tested using suspended particle load data collected at a road site located in Toowoomba, Australia. Agreement between the washoff concepts and measured data is most consistent for intermediate-duration storms (duration<5hrs and >1hr). Particle loads resulting from these storm events increase linearly with average rainfall intensity. Above a threshold intensity, there is evidence to suggest a constant or plateau particle load is reached. The inclusion of a peak discharge factor (maximum 6-minute rainfall intensity) enhances the ability to predict particle loads.

Keywordsstormwater; road runoff; suspended solids; particle washoff; buildup-washoff
ANZSRC Field of Research 2020400512. Transport engineering
401208. Geophysical and environmental fluid flows
400513. Water resources engineering
Public Notes

© IWA Publishing 2011. Published version deposited in accordance with the copyright policy of the publisher.

Byline AffiliationsDepartment of Agricultural, Civil and Environmental Engineering
Queensland University of Technology
Institution of OriginUniversity of Southern Queensland
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