| MODFLOW |
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| Pre-processing |
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MODFLOW Commands |
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Building a MODFLOW Model |
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Map to MODFLOW |
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Calibration |
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Packages Supported in GMS |
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Saving a MODFLOW Simulation |
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Importing MODFLOW Files |
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Unsupported MODFLOW Features |
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Run MODFLOW |
| Post-processing |
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MODFLOW Display Options |
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MODFLOW Post-Processing Viewing Options |
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Reading a MODFLOW Simulation |
| Tutorials |
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| Packages |
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| Flow: |
BCF6, HUF, LPF, UPW |
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| Solvers: |
DE4, GMG, NWT, PCG,
PCGN, LMG, SIP, SOR,
SMS |
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| 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 |
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Starting at GMS version 8.2, GMS supports MODFLOW-NWT. 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 that are non-linear due to unconfined cells or non-linear boundary conditions.
Choosing MODFLOW Version
Choosing to use MODFLOW 2000, MODFLOW 2005, or MODFLOW-NWT is done in the MODFLOW Global Options Dialog. At any time you can switch from one to the other.
MODFLOW Global Option Dialog
Changes to MODFLOW 2005
Source code differences between MODFLOW 2005 and MODFLOW-NWT.
- UPW Package
- NWT Solver
- WEL Package
- The WEL package was modified to add an option to decrease the pumping rate as the head drops below a user-specified percentage of cell thickness. The new option is called PHIRAMP.
- SFR Package
- The SFR package is modified to avoid removing water from dry cells and to calculate derivatives for the Newton formulation.
- UZF Package
- The UZF package is modified to avoid removing water from dry cells and to calculate derivatives for the Newton formulation.
- Other Packages
- Poor input values for other packages can result in convergence failure. For example, an EVT extinction depth below the cell bottom elevation can result water being improperly removed from a dry cell.
MODFLOW-NWT Files
Here are tables of some of the available input and output files for MODFLOW-NWT. Note: MODFLOW will produce the LMT and HFF files even if transport is turned off.
- For more information on these files see the manual
Required Input Files
| Name
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Description
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| MFN |
MODFLOW Name File
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| GLO |
Global Listing File
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| DIS |
Discretization File
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| OC |
Process Output Control Option File
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| BA6 |
Basic Package Global Options File
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Solver Package File
| Name
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Description
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| DE4 |
Direct
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| GMG |
Geometric Multi-Grid
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| LMG |
Link Algebraic Multi-Grid
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| NWT |
Newton
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| PCG |
Preconditioned Conjugate-Gradient
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| SIP |
Strongly Implicit Procedure
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Input Flow Package Files
| Name
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Description
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| BCF |
Evapotranspiration Segments
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| HUF |
Evapotranspiration
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| LPF |
Layer Property Flow
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| UPW |
Unsaturated-Zone Flow
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Optional Package Files
| Name
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Description
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| ASP |
PEST Advanced Spacial Parameterization
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| CHD |
Time-Variant Specified-Head
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| DRN |
Drain
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| DRT |
Drain Return
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| EVT |
Evapotranspiration
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| ETS |
Evapotranspiration Segments
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| GAG |
Gage
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| GHB |
General Head Boundary
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| HFB |
Horizontal Flow Barrier
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| LAK |
Lake
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| RCH |
Recharge
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| RIV |
River
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| SFR |
Streamflow-Routing
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| STR |
Stream-Routing
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| SUB |
Subsidence
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| SWI |
Seawater Intrusion
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| UZF |
Unsaturated-Zone Flow
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| WEL |
Process Well
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Observation Input Files
| Name
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Description
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| OBS |
Main Observation Process Input
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| DROB |
Drain Observation
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| CHOB |
Constant-Head Flow Observation Input
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Output Files
| Name
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Description
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| MFS |
MODFLOW Super File
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| MFW |
GMS MODFLOW World File
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| MFR |
GMS MODFLOW Result Index File
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| PRJ |
Projection
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| CSV |
Cell Summary Comma Separated Value Excel
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| HFF |
Head and Flow File Link to MT3DMS
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| H5 |
Hierarchal Data Format (HDF5) Array & List Data
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| LMT |
Link Modular Transport (MT3DMS)
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| M2P |
MODFLOW Pest
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| PARAM |
Parameter Information
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Output Results Files
| Name
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Description
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| CCF |
Cell-to-Cell Aquifer Flow
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| CCF2 |
Cell-to-Cell Stream Reach Outflow
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| DRW |
Drawdown
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| GLO |
Global Listing
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| HED |
Head Output
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| OUT |
Output
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Output Package Files
| Name
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Description
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| MNW |
Multi-Node Well
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| MNW2 |
Multi-Node Well Version 2
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| MNWI |
Multi-Node Well Information
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| SWIBUD |
Seawater Intrusion Package Budget
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| SWIZETA |
Sewater Intrusion Package Zeta Surface
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Output Data Exchange Files
| Name
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Description
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| _W |
Weighted Residuals
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| _WW |
Weighted Equivalents & Weighted Observation
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| _WS |
Weighted Residuals and Simulated Equivalents
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| _R |
Unweighted Residuals
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| _OS |
Observed Values and Simulated Equivalents
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| _B |
Data Exchange File
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| _NM |
Weighted Residuals and Probability Plotting
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External Links
