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I'm a newer user building a MODFLOW model that I will then need to teach others how the model was constructed, I am establishing a coverage for the WEL package that will use a point shapefile from another model to inform the location and pumping/abstraction rates. One of the attributes in the shapefile is "Layer", identifying the layer of the well in the 10 layers of the model. I was shown how to create the coverage but I wanted to understand the rationale for selecting the Layer Range item in the Source/Sink/BCs list. I'm guessing this allows the use of the Layer attribute to map the points to specific layers in the Solid and Grid models, assuming they appear within layers 1 to 10, as specified. Also, I had a question about the "Use to define model boundary (active area)" check box. I have conflicting information as to when that should be checked in a coverage. My intuition tells me that is would only apply to feature objects that define the model boundary and not necessarily other boundary conditions that are applied to the model boundary conditions. For example, given one coverage (a polygon) that defines the extent of the active region of the model across all layers is create with the "Use to define..." item checked. If separate coverage was created that defines a constant head on layers along one edge of the active model domain, already identified as active in the other coverage, does the box need to be checked? When should it be check and not? Is there a danger in checking the box when it shouldn't. Any insights are appreciated Ted