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

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. ISSN 1998-9563

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © IWA Publishing 2011. Published version deposited in accordance with the copyright policy of the publisher.
Depositing User: Mr Ian Brodie
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 25 Sep 2011 04:55
Last Modified: 14 Oct 2014 01:06
Uncontrolled Keywords: stormwater; road runoff; suspended solids; particle washoff; buildup-washoff
Fields of Research (FOR2008): 09 Engineering > 0905 Civil Engineering > 090507 Transport Engineering
04 Earth Sciences > 0404 Geophysics > 040403 Geophysical Fluid Dynamics
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960912 Urban and Industrial Water Management
Identification Number or DOI: doi: 10.2166/nh.2011.117
URI: http://eprints.usq.edu.au/id/eprint/19114

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