Abstract
Understanding the influence of meteorological characteristics on pollutant build-up and wash-off is essential for stormwater quality modelling. Total suspended solids (TSS) and heavy metals (copper, lead, and zinc) in runoff from impermeable concrete boards were quantified after different rain events, along with rain depth, peak rain intensity, rain duration, antecedent dry days, and wind patterns to assess the influence of these on runoff quality. Results indicated that peak rainfall intensity had a significant relationship with TSS and total Pb, whereas total copper and total zinc had a significant relationship with rain depth. This indicates that pollutant wash-off is influenced more by peak rain intensity when the pollutants are predominantly in their particulate phase. Conversely, rain depth exerts a greater influence on pollutant wash-off when a high portion of the pollutants are predominantly in their dissolved phase. All pollutants (total Cu, Pb, Zn, and TSS) had a significant correlation with antecedent dry days, suggesting it is an important factor in pollutant build-up preceding rainfall wash-off.
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