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

Brodie, Ian M. & Egodawatta, Prasanna (2011) Relationships between rainfall intensity, duration and suspended particle washoff from an urban road surface. Hydrology Research, 42(4), pp. 239-249.

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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 <5 h and >1 h). 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 min rainfall intensity) enhances the ability to predict particle loads.

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12 citations in Scopus
12 citations in Web of Science®
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111 since deposited on 17 Oct 2011
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ID Code: 43758
Item Type: Journal Article
Refereed: Yes
Keywords: Buildup-washoff, Particle Washoff, Road Runoff, Stormwater, Suspended Solids
DOI: 10.2166/nh.2011.117
ISSN: 0029-1277
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2011 I W A Publishing
Copyright Statement: ©IWA Publishing 2011. The definitive peer-reviewed and edited version of this article is published in Hydrology Research 42 (4) pp. 239-249. 2011. DOI 10.2166/nh.2011.117 and is available at
Deposited On: 17 Oct 2011 00:35
Last Modified: 22 Jun 2017 23:54

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