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The USGS MODFLOW-NWT is a Newton-Raphson formulation for MODFLOW-2005 to improve solution of unconfined groundwater-flow problems. MODFLOW-NWT is a standalone program that is intended for solving problems involving drying and rewetting nonlinearities of the unconfined groundwater-flow equation.
The best place to learn about MODFLOW and related programs is the <a href=\"https://www.usgs.gov/mission-areas/water-resources/science/modflow-and-related-programs\"> USGS MODFLOW website.</a>
"
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