A pollution displacement model of the Great Lakes system is presented, together with a brief review of previous Great Lakes water balance and pollution displacement models.The DYNAMO II language is utilized in a simulation of historical water balance relationships and a water pollution transport system for dissolved substances in each lake. The model enacts a continuous simulation of some hydrologic and water quality components of each subsystem, while making the concentration of pollutant in a downstream lake partially dependent upon the calculated inflow from the upstream lake.The concept of residence time or response time of a lake is developed.Due to the long residence time of pollution in the Great Lakes, especially in Lakes Superior and Michigan, the effects of water quality degradation or improvement may not be detectable for many decades.

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