Author(s)

S. Beecham

Abstract

Improving the modelling of pollutant discharges S. Beecham School of Civil Engineering, University of Technology, Sydney, Australia 1. Introduction It is only in recent times that the focus of urban drainage design has shifted from a purely quantitative approach to a more holistic, catchment-based philosophy that considers many criteria, including water quality. Instead of collecting and discharging runoff as quickly as possible, we now utilise both natural and artificial storage in order to achieve natural, pre-urbanized peak rates of flow. At the same time, more consideration is given to environmental concerns, and in particular to the pollutant impacts on watercourses. There are many ways of assessing water quality. Shubinski and Tierney (1) identified four types of water quality problem: 1. damaging point source waste discharges (domestic and industrial), 2. damaging non-point loads generated by urban and rural land

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