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Compare Heads or Drawdown

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Visual MODFLOW Flex allows you to compare Heads or Drawdown between several model runs.  This is useful to determining differences in pre- and post-pumping heads or comparing impacts to heads or drawdown when adjusting property or boundary condition parameters.

Follow the steps below:


Right-click on the Heads node of any model run, and select the "Compare" option. The following dialog will appear



There are two options available:

Select a Heads from the Output tree from another model run; in this case, click on the Heads node from another model run, and click on the button to add this to the field

Select a MODFLOW .HDS file from the hard drive, from another model. Click on the Open folder button and browse to a .HDS file on the hard drive.

Click OK.  A new view will appear.  The plot shows the results of subtracting the heads selected specified above from the Heads where you launched the `Compare Heads` option.



The same option is available for Drawdown.  Just launch `Compare` from the Drawdown node on the Output model tree, and choose the Drawdown from another model run, or a .DDN file from the hard disk.


The comparison calculation has the following assumptions: Both models must have the same:

start date (as defined in the Conceptual Model settings),

stress periods,

spatial coverage (XY extents), and

angle of rotation



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