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Understanding urban road surface pollutant wash-off and underlying physical processes using simulated rainfall

Egodawatta, Prasanna K. & Goonetilleke, Ashantha (2008) Understanding urban road surface pollutant wash-off and underlying physical processes using simulated rainfall. Water Science and Technology, 57(8), pp. 1241-1246.

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Abstract

Pollutant wash-off is one of the key pollutant processes that detailed knowledge is required in order to develop successful treatment design strategies for urban stormwater. Unfortunately, current knowledge relating to pollutant wash-off is limited. This paper presents the outcomes of a detailed investigation into pollutant wash-off on residential road surfaces. The investigations consisted of research methodologies formulated to overcome the physical constraints due to the heterogeneity of urban paved surfaces and the dependency on naturally occurring rainfall. This entailed the use of small road surface plots and artificially simulated rainfall. Road surfaces were selected due to its critical importance as an urban stormwater pollutant source.

The study results showed that the influence of initially available pollutants on the wash-off process was limited. Furthermore, pollutant wash-off from road surfaces can be replicated using an exponential equation. However, the typical version of the exponential wash-off equation needs to be modified by introducing a non dimensional factor referred to as ‘capacity factor’ (CF). Three rainfall intensity ranges were identified where the variation of CF can be defined. Furthermore, it was found that particulate density rather than size is the critical parameter that influences the process of pollutant wash-off.

Impact and interest:

6 citations in Scopus
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4 citations in Web of Science®

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109 since deposited on 10 Jun 2008
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ID Code: 13707
Item Type: Journal Article
Keywords: Pollutant wash, off, Rainfall simulation, Urban water quality, Water pollution
DOI: 10.2166/wst.2008.260
ISSN: 0273-1223
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Water Quality Engineering (090508)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700) > Environmental Engineering Modelling (090702)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700) > Environmental Engineering Design (090701)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 IWA Publishing
Deposited On: 10 Jun 2008
Last Modified: 23 May 2012 14:05

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