ABSTRACT
The optimum system is the one that best fulfills the objective given the constraints, the one, for example, that minimizes the costs associated with waste disposal. The amount of investment required in pollution control makes it important and the most effective methods to be applied to the efficient attainment of objectives in the field. The application of systems analysis techniques to pollution control and, even more, to the full scope of system design is an exceedingly complex difficult task and is unlikely to lead to fully dependable solutions. The analysis of pollution in isolation is an unsatisfactory method for use in actual situations since it neglects important interdependencies in the use and control of water resources. In applying simulation the significant elements of a process are translated into a set of status variables, input variables, output variables, and relations.
