ABSTRACT
Pollution from urban stormwater runoff, combined sewer overows, and highway runoff is by nature complex and site-specic. The stochastic nature of the rainfall, the variability of pollutant sources and loads, the inuence of the infrastructure, the different types of systems that manage the runoff, and the effect of the local cultural behavior are just examples of what contribute to the complexity. These characteristics are, in several ways, different compared with corresponding aspects of the dry weather pollution from urban areas. A consequence is that legislation and regulation must be specically formulated to comply with these wet weather characteristics.
