Assign Porosity and Longitudinal Dispersivity and  in GWT Model

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The model has a longitudinal dispersivity of 20 and a porosity of 0.3. These can be set in the Data Sets dialog box. Select "Edit|Edit Data Sets" to display it.

Specify Porosity and Longitudinal Dispersivity

The horizontal and vertical dispersivity and diffusion coefficient are specified by layer in the MODFLOW Layer Groups dialog box. However, the default values for those variables match the variables used in this model so it is not necessary to  change them.