E2 is a software product for whole-of-catchment modelling. It is designed to allow modellers and researchers to construct models by selecting and linking component models from a range of available choices. E2 enables a flexible modelling approach, allowing the attributes and detail of the model to vary in accordance with modelling objectives.

In E2, the model structure and algorithms are not fixed. They are defined by the user, who can choose from a suite of available options. Model selection requires the user to be familiar with the detail, applicability and data requirements of component models, and the implications of joining component models. E2 is therefore intended to be a tool for experienced catchment modellers.

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