There are several parts of the stream model where the underlying equations used were derived from the stream data rather than controlled experiments. Therefore, it is in large part, a statistical model, as are many weather models. Controlled experiments can help determine these relationships. Discuss linear relationships in the model, such as the linear regression equation which was derived from the stream data, describing the relationship between water temperature and dissolved oxygen. Discuss seasonal oscillations such as seen in D.O. and Run-off graphs.
Systems often exhibit both change and constancy.
Human impact on a system can be so severe that the equilibrium is disrupted to the point where many fewer species are supported. These materials are currently being used in classrooms throughout the state of Maryland. They are periodically revised based upon feedback from classroom implementation. The Run-Time demo version will allow you to run the stream and other models. You cannot save models you change or construct.