Freedom251 › Groundwater Modeling Software
MODFLOW-USG
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| MODFLOW-USG | Current version 1.5; source code, user guides, and example problems | Free |
As usgs.gov lists them, read 14 Nov 2026. The maker's own page has the final word.
Facts from MODFLOW-USG's own pages
- Connected Linear Network
- The CLN Process can simulate multi-node wells, karst conduits, and tile drains, and is tightly coupled to GWF. · usgs.gov, 14 Nov 2026
- Download
- The USGS download page lists version 1.5 and provides links to the release notes, program, source code, user guides, and examples. · water.usgs.gov, 14 Nov 2026
- Ghost Node Correction
- The GNC Package uses interpolated heads between connected cells to improve accuracy for irregular or nested grids. · usgs.gov, 14 Nov 2026
- Grid resolution
- Grid design can focus resolution near rivers and wells or subdivide layers to better represent hydrostratigraphic units. · usgs.gov, 14 Nov 2026
- Grid types
- It supports structured and unstructured grids, including nested grids and grids built from several cell shapes. · usgs.gov, 14 Nov 2026
- Groundwater flow process
- The GWF Process is based on the GWF Process in MODFLOW-2005. · usgs.gov, 14 Nov 2026
- Newton-Raphson
- An optional Newton-Raphson formulation can improve convergence and avoid cell drying and rewetting problems. · usgs.gov, 14 Nov 2026
- Numerical formulation
- Its control-volume finite-difference formulation allows a cell to connect to an arbitrary number of adjacent cells. · usgs.gov, 14 Nov 2026
- Purpose
- MODFLOW-USG simulates groundwater flow and tightly coupled processes. · usgs.gov, 14 Nov 2026
- Related utility
- GRIDGEN is a utility for creating layered quadtree grids for MODFLOW-USG. · usgs.gov, 14 Nov 2026
- Solver
- MODFLOW-USG replaces the existing MODFLOW solvers with a Sparse Matrix Solver package developed for the software. · usgs.gov, 14 Nov 2026
- Solver methods
- The SMS Package offers nonlinear solution methods and symmetric and asymmetric linear solution schemes. · usgs.gov, 14 Nov 2026
- Support contact
- The listed contact is the USGS MODFLOW Team at [email protected]. · usgs.gov, 14 Nov 2026
- Support status
- The USGS says superseded versions are not actively supported; the page does not state that this applies to the current release. · usgs.gov, 14 Nov 2026
Where MODFLOW-USG stands on Freedom251
- Groundwater Modeling Software#6 of 11