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After installation, next steps involve creating a sub-catchments scenario with the Geographic Wizard for catchments, and configuring various parameters to model groundwater. Just as with any catchments scenario, use the wizard to first create a standard set of sub-catchments to suit your study area and modelling requirements in Define the networkNetwork (Step 3). Next define the functional units using a shape file (refer to Specify functional units (Step 5) for details) and assign areas to them using a raster (Specify functional unit areas (Step 6)). Figure 166 1- shows an example of this. The next section provides details on configuring rainfall runoff, constituent generation and filter models in Source.