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MODFLOW is a cell-centered, saturated flow model that can perform both steady state and transient analyses and has a wide variety of boundary conditions and input options.
MODFLOW-USG
Category
Type
Method
Description
Groundwater flow modeling
3D
Finite volume
MODFLOW-USG supports a wide variety of structured and unstructured grid types, including nested grids and grids based on prismatic triangles, rectangles, hexagons, and other cell shapes. Flexibile grid designs can be used to focus resolution along rivers & around wells and speed up model runtimes.
MODFLOW-NWT
Category
Type
Method
Description
Groundwater flow modeling
3D
Finite difference
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 concerned with wetting and drying of cells.
MODFLOW-LGR
Category
Type
Method
Description
Groundwater flow modeling
3D
Finite difference
MODFLOW-LGR is a version of MODFLOW based on MODFLOW-2005 that offers local grid refinement by using multiple grids to provide model refinement in one or more areas of the model without having to refine the entire model.
MODPATH
Category
Type
Method
Description
Groundwater transport modeling
3D
Finite difference
MODPATH is a particle tracking code that is used in conjunction with MODFLOW. By designating the location of a set of particles, they can be tracked either forward or backward in time.
MT3DMS
Category
Type
Method
Description
Groundwater transport modeling
3D
Finite difference
MT3DMS is a modular three-dimensional transport model for the simulation of advection, dispersion, and chemical reactions of dissolved constituents in groundwater systems.
PHT3D
Category
Type
Method
Description
Groundwater transport modeling
3D
Finite difference
PHT3D is a multicomponent transport model for three-dimensional reactive transport in saturated porous media. PHT3D is a combination of MT3DMS and PHREEQC-2.
SEAWAT
Category
Type
Method
Description
Groundwater transport modeling
3D
Finite difference
SEAWAT is a coupled version of MODFLOW 2000 and MT3DMS and is designed to simulate three-dimensional, variable-density ground-water flow and multi-species transport including solute and heat transport simultaneously.
RT3D
Category
Type
Method
Description
Groundwater transport modeling
3D
Finite difference
RT3D is a multi-species reactive transport model and is a modified version of MT3DMS that utilizes alternate Chemical Reaction packages. RT3D is well-suited for simulating natural attenuation and bioremediation.
SEAM3D
Category
Type
Method
Description
Groundwater transport modeling
3D
Finite difference
SEAM3D is a reactive transport model based on the MT3DMS code and is used to simulate complex biodegradation problems involving multiple substrates and multiple electron acceptors.
HydroGeoSphere
Category
Type
Method
Description
Groundwater transport modeling
3D
Finite Element
HGS is a three-dimensional control-volume finite element simulator designed with an entirely physics-based approach to modeling groundwater/surface water hydrology.
MODAEM
Category
Type
Method
Description
Groundwater flow & transport modeling
2D
Analytical Element
MODAEM is an analytic element groundwater flow model that is defined by “analytic elements” rather than discritized cells as is the case with finite difference or finite element models resulting in a more simplified approach.
SEEP2D
Category
Type
Method
Description
Groundwater flow modeling
2D
Finite element
SEEP2D is a two-dimensional steady state groundwater model used to simulate saturated and unsaturated flow. The model is typically used on profile models (XZ models) such as cross-sections of earth dams or levees.
FEMWATER
Category
Type
Method
Description
Groundwater flow & transport modeling
3D
Finite element
FEMWATER is a 3D finite element, density driven, flow and transport model used in saturated and unsaturated zones.
FEFLOW
Category
Type
Method
Description
Groundwater flow & transport modeling
3D
Finite element
FEFLOW is 3D groundwater model capable of modelling fluid flow and transport of dissolved constituents and/or heat transport processes in the subsurface.
TOUGH2
Category
Type
Method
Description
Unsaturated Groundwater and Heat Transport Modeling
3D
Finite difference
TOUGH2 is 3D groundwater and heat transport model capable of simulating the coupled transport of water, vapor, non-condensible gas, and heat in porous and fractured media.
PEST & Parallel PEST
Category
Type
Method
Description
n/a
3D
n/a
PEST is a general purpose parameter estimation utility used to perform automated parameter estimation for MODFLOW models.
ZONEBUDGET
Category
Type
Method
Description
Groundwater flow modeling analysis
3D
n/a
ZONEBUDGET is a USGS program that reads cell to cell flow data produced by MODFLOW and calculates water budgets for subregions of the modeled area.
SAMG Solver
Category
Type
Method
Description
n/a
3D
n/a
SAMG is a mulitgrid solver utility for MODFLOW. SAMG is the most efficient solver available for use with MODFLOW reducing computations by up to one to two magnitudes depending on the application and problem size.
T-PROGS
Category
Type
Method
Description
Stochastic subsurface modeling
3D
n/a
The T-PROGS utility is used to perform transition probability geostatistics on borehole data.
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