GMS:MODFLOW-NWT

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Starting at GMS version 8.2, GMS supports MODFLOW-NWT.MODFLOW-NWT is a version of MODFLOW based on MODFLOW-2005 that provides a different formulation of the groundwater flow equation designed to solve models that are non-linear due to unconfined cells or non-linear boundary conditions.

Choosing MODFLOW Version

Choosing to use MODFLOW 2000, MODFLOW 2005, or MODFLOW-NWT is done in the MODFLOW Global Options Dialog. At any time you can switch from one to the other.

MODFLOW Global Option Dialog

Changes to MODFLOW 2005

1. UPW Package
  • MODFLOW-NWT contains the UPW flow package. The UPW flow package is based on the LPF package. It differs from the LPF package in that it smoothes the horizontal conductance and storage change functions to have a continuous derivatives so they can be solved by the Newton method. Using the UPW package requires using the NWT solver.
2. NWT Solver
3. WEL Package
4. SFR Package
5. UZF Package