GMS:Building a MODFLOW Model

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MODFLOW
Pre-processing
MODFLOW Commands
Building a MODFLOW Model
Map to MODFLOW
Calibration
Packages Supported in GMS
Saving a MODFLOW Simulation
Importing MODFLOW Files
Unsupported MODFLOW Features
Post-processing
MODFLOW Display Options
MODFLOW Post-Processing Viewing Options
Reading a MODFLOW Simulation
Tutorials
MODFLOW Tutorials
Packages
Flow: BCF6, HUF, LPF, UPW
Solvers:

DE4, GMG, NWT, PCG,

PCGN, LMG, SIP, SOR,

SMS
Other:

BAS6, BFH, CHD1, CLN,

DRN1, DRT1, EVT1, ETS1,

GAGE, GHB1, GNC, HFB1,

HUF, LAK3, MNW1, MNW2,

OUT1, RCH1, RIV1, SFR2,

STR1, SUB1, SWI2, WEL1,

UZF1

Two basic approaches are provided in GMS for constructing a MODFLOW model: the model can be completely defined using the tools in the 3D Grid module, or the model can be defined with the aid of the feature objects in the Map module. Also, scatter points and solids can be used to define layer elevation, and boreholes can be used with TPROGS to create material sets for the 3D grid.

Basic Steps in Building a MODFLOW Model

The basic steps in building a MODFLOW model include:

  1. Build a 3D grid defining the extents of the model. Two approaches are available:
  2. Initialize MODFLOW
  3. Assign boundary conditions and model stresses, including sources and sinks
  4. Define layer elevations
  5. Assign material properties
  6. Run MODFLOW

The MODFLOW Simulation

When a new MODLOW simulation has been initiated, it will appear under the 3D Grid or 3D Ugrid in the Project Explorer. Also in the Project Explorer, MODFLOW packages that are included in the simulation will be listed under the simulation.

Right-clicking on the simulation icon will produce a menu. Selecting the Properties command will bring up a Properties dialog. This dialog will show details about the simulation such as which version of MODFLOW is being used, where the simulation is being saved, if the simulation is steady state or transient, the number of stress periods, and run options. The dialog also contains a Notes tab where comments and other notes can be saved.