GMS:MODFLOW-NWT Workflow

To use MODFLOW-NWT in an existing MODFLOW project, use the following processes:

1. Change the simulation to use MODFLOW-NWT.
Select MODFLOW \| Global Options. In the MODFLOW Global/Basic Package dialog, select the NWT radio button.

2. Activate the UPW and NWT packages.
In the MODFLOW Global/Basic Package dialog, select the Packages button. In the MODFLOW Packages/Processes dialog, select the UPW – Upstream Weighting option. The NWT – Newton solver option will automatically be selected when the UPW package is selected.

3. Set UPW options.
Select MODFLOW \| UPW – Upstream Weighting menu command. Set options in the UPW Package dialog.

4. Set NWT solver options.
Select MODFLOW \| NWT – Newton Solver menu command. Set options in the MODFLOW NWT Solver dialog.

5. Specify PHIRAMP.
Select MODFLOW \| Optional Packages \| WEL – Wel menu command. In the MODFLOW Well Package dialog, specify PHIRAMP.

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