GMS:MODFLOW-2005

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
	Run MODFLOW
Post-processing
	MODFLOW Display Options
	MODFLOW Post-Processing Viewing Options
	Reading a MODFLOW Simulation
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
	v • e

Starting at GMS version 8.0, GMS supports MODFLOW 2005.

Choosing MODFLOW-2000 or MODFLOW-2005

Choosing to use MODFLOW-2000 or MODFLOW-2005 is done in the MODFLOW Global Options dialog. At any time you can switch from one to the other.

MODFLOW Global Option dialog

The following list shows changes in MODFLOW-2005 from MODFLOW-2000.

1. SOR1 Solver

2. PCG2 Solver

MODFLOW-2005 replaces the DAMP variable with DAMPPCG and DAMPPCGT variables [1]. These two new variables allow different damping factors to be applied separately to steady-state and transient stress periods.

3. UZF Package

4. LPF package

MODFLOW-2005 provides more options for the LPF Package. Pictures below show the LPF package options supported in MODFLOW-2000 vs MODFLOW-2005.

MODFLOW 2000 LPF Package Options

MODFLOW 2005 LPF Package Options

5. PES and PEST

PES is not available in MODFLOW 2005. Automated calibration in GMS is handled using PEST.

Here are tables of some of the available Input and Output files for MODFLOW 2005.

**Input Files**
Name	Description
MFN	MODFLOW Name File
GLO	Global Listing File
LMT	Link-MT3DMS Package
OBS	Main Observation Process input file
CHOB	Constant-Head Flow Observation Input File
RIV	River Package
SFR	Streamflow-Routing Package
STR	Stream-Routing Package
SUB	Subsidence Package
ASP	PEST Advanced Spacial Parameterization Package
GHB	General Head Boundary Package
DRT	Drain Return Package
DROB	Drain Observation File
HFB	Horizontal Flow Barrier Package
ETS	Evapotranspiration Segments Package
EVT	Evapotranspiration Package
UZF	Unsaturated-Zone Flow Package
DIS	Discretization File
BA6	Basic Package
LPF	Layer Property Flow Package
SWI	Seawater Intrusion Package
OC	Process Output Control Option
RCH	Recharge Package
WEL	Process Well Package
CHD	Time-Variant Specified-Head Package
PCG	Preconditioned Conjugate-Gradient Package

**Output Files**
Name	Description
MFS	MODFLOW Super File
MFR	GMS MODFLOW Result Index File
MFW	GMS MODFLOW World File
CSV	Cell Summary Comma Separated Value Excel File
MNW	Multi-Node Well Package
MNW2	Multi-Node Well Package Version 2
MNWI	Multi-Node Well Information Package
MFW	GMS MODFLOW World File
PRJ	Projection File
HFF	Head and Flow File Link to MT3DMS
H5	Hierarchal Data Format (HDF5) Array & List Data File
SWIBUD	Seawater Intrusion Budget File
SWIZETA	Sewater Intrusion Zeta Surface File
HED	Head Output File
_W	Weighted Residuals Data Exchange File
_WW	Weighted Equivalents & Weighted Observation
_WS	Weighted Residuals and Simulated Equivalents
_R	Unweighted Residuals Data Exchange File
_OS	Observed Values and Simulated Equivalents File
_B	Data Exchange File
_NM	Weighted Residuals and Probability Plotting file
OUT	Output File
CCF	Cell-to-Cell Aquifer Flow File
CCF2	Cell-to-Cell Stream Reach Outflow File
GLO	Global Listing File
HED	HDF5 Head File

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