Comparison And Method Choice

Use this page as the MODFLOW-family entry point when a result differs between flow/modflow6 and flow/modflow_nwt.

Before attributing a difference to the numerical backend, check the comparison contract in this order:

• physical support and active cells;

• mesh topology and vertical representation;

• stress periods, forcing aggregation, and initial state convention;

• recharge, storage, drainage, imposed-head, and well package semantics;

• output variable role: state snapshot, period budget, or reduced diagnostic.

The detailed scientific comparison is documented in:

• MODFLOW 6 Versus MODFLOW-NWT: Scientific Comparison

• Solver Capability Matrix

• MODFLOW Governing Equation And CVFD Formulation

• MODFLOW Package Semantics And Option Selection

For benchmark-style comparisons across solvers, also read the comparison workflow output conventions:

• Comparison Output Reading Order

• Results and Exports