This book presents new findings on intrinsic variability in pollutant
build-up and wash-off processes by identifying the characteristics of
underlying process mechanisms, based on the behaviour of various-sized
particles. The correlation between build-up and wash-off processes is
clearly defined using heavy metal pollutants as a case study. The
outcome of this study is an approach developed to quantitatively assess
process uncertainty, which makes it possible to mathematically
incorporate the characteristics of variability in build-up and wash-off
processes into stormwater quality models. In addition, the approach can
be used to quantify process uncertainty as an integral aspect of
stormwater quality predictions using common uncertainty analysis
techniques. The information produced using enhanced modelling tools will
promote more informed decision-making, and thereby help to improve urban
stormwater quality.