GMS:MF6 HFB Package

The Horizontal Flow Barrier (HFB) Package dialog

The Horizontal Flow Barrier (HFB) Package dialog is accessed by double-clicking on the HFB package under a MODFLOW 6 simulation in the Project Explorer. It contains the following sections and options:

• Sections list – A list of sections that can be turned on or off:
  • Comments – Turn on to make the Comments section visible.
  • Options – Turn on to make the Options section visible.
  • Periods – Turn on to make the Periods section visible. This section is on by default.
• Comments section – Enter general alphanumeric comments. Comments entered here get written at the top of the file, preceded by a '#' symbol.
• Options section – Temporal options and settings:
  • Print input to listing file (PRINT_INPUT) – Turn on to write the list of recharge information to the listing file immediately after it is read.
• Periods section – Contains the following:
  • Period drop-down – Use the Increment Up and Down buttons to select the desired period.
  • Define Period – If no period is defined, click to make the spreadsheet editable.
  • Delete Period – Click to delete the existing period.
  • Table – Contains the following:
    • LAY1 – Identifier for the first layer.
    • ROW1 – Identifier for the first row.
    • COL1 – Identifier for the first column.
    • LAY2 – Identifier for the second layer.
    • ROW2 – Identifier for the second row.
    • COL2 – Identifier for the second column.
    • HYDCHR – The hydraulic characteristic of the horizontal-flow barrier. When this variable is negative it multiplied by the conductance of two cells.

Add Stresses Dialog

The Add Stresses dialog for the HFB package

The Add Stresses dialog is accessed by clicking Add Rows in the Periods section of several MODFLOW 6 package dialogs. It contains the following sections and options:

• Table – Table Options differ according to each package. See chart below.

• Number of rows to add – Use the Increment Up and Down buttons to select the desired number of rows to add.

• Add to section – Radio buttons with the following options:
  • All defined periods – Select to add the rows to all defined periods.
  • Only this period – Select to add the rows to only this period.

Package	Add Stresses Dialog Table Options
CHD	CHD Options LAY – Used to specify certain layers. ROW – Used to specify certain rows. COL – Used to specify certain columns. HEAD – Represents the head at the boundary.
DRN	DRN Options LAY – Used to specify which layer is being applied. ROW – Used to specify which row is being applied. COL – Used to specify which column is being applied. ELEV – Represents the elevation of the drain. COND – Represents the hydraulic conductance between the aquifer and the drain.
GHB	GHB Options LAY – Used to specify certain layers of the module. ROW – Used to specify which row is being applied. COL – Used to specify which column is being applied. BHEAD – Represents the boundary head. COND – Represents the hydraulic conductance between the aquifer cell and the boundary.
HFB	HFB Options LAY1 – Represents the first of two chosen layers. ROW1 – Represents the first of two chosen rows. COL1 – Represents the first of two chosen columns. LAY2 – Represents the second of two chosen layers. ROW2 – Represents the second of two chosen rows. COL2 – Represents the second of two chosen columns. HYDCHR – The hydraulic characteristic of the horizontal-flow barrier. When this variable is negative it multiplied by the conductance of two cells.
LAK	LAK Options LAKENO_OUTLETNO – A value that defines the reach number associated with the specified PERIOD data. SETTING – Information that is linked to keywords and values. VALUE1 – Value to be entered in relation to the specific project. VALUE2 – Value to be entered in relation to the specific project.
MAW	MAW Options WELLNO – A value that defines the reach number associated with the specified PERIOD data. MAWSETTING – Information that is linked to keywords and values. VALUE1 – Value to be entered in relation to the specific project. VALUE2 – Value to be entered in relation to the specific project. VALUE3 – Value to be entered in relation to the specific project.
RIV	RIV Options LAY – Used to specify which row is being applied. ROW – Used to specify which row is being applied. COL – Used to specify which column is being applied. STAGE – Variable that represents the head in the river. COND – Variable that represents the riverbed hydraulic conductance. RBOT – Variable that represents the elevation of the bottom of the riverbed.
SFR	SFR Options RNO – A value that defines the reach number associated with the specified PERIOD data. SFRSETTING – Information that is linked to keywords and values. VALUE1 – Value to be entered in relation to the specific project. VALUE2 – Value to be entered in relation to the specific project.
UZF	UZF Options IUZNO – An integer value that defines the UZF cell number associated with the specified PERIOD data on the line. FINF – A value that defines the applied infiltration rate of the UZF cell. PET – A value that defines the ET rate of the UZF cell and specified GWF cell. EXDP – A value that defines the ET extinction depth of the UZF cell. EXTWC – A value that defines the amount of water removed from the UZF cell through evapotranspiration. HA – A value that defines the amount of potential air that enters the UZF cell. HROOT – A value that defines the root potential of the UZF cell. ROOTACT – A value that defines how much root activity exists in the UZF cell.
WEL	WEL Options LAY – Represents which layer within the grid to which the chosen well will be assigned. ROW – Represents which row within the grid to which the chosen well will be assigned. COL – Represents which column within the grid to which the chosen well will be assigned. Q – Represents the volumetric well rate at which the recharge (positive value) and discharge (negative value) of the well will be.

Related Topics

• MODFLOW 6