Traditionally, estimation of fully mixed in-stream pollutant concentrations has provided a means to assess whether pollutants discharged from a continuous point polluting source surpass water quality criteria for aquatic life, wildlife, and human health.
Dupuis (2002) presented expressions for estimating the fully mixed in-stream pollutant concentrations for various types of receiving waters as shown below
teams and Rivers e in stream concentration of pollutants can be estimated given the average stream and runoff flows and the concentrations of pollutants in the upstream and runoff flows. This is calculated for chlorides as