In many software packages conceptual diagrams are used to input the model. For example, one of the reasons that system dynamics software, such as Stella, became so popular in modeling is because they are also handy tools to put together conceptual diagrams, and, moreover, these diagrams are then automatically converted into numeric computer models. Figure 7 presents a sample conceptual model for a river system put together in the Stella interface. It describes the river network as a combination of
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