GMS:MF6 UZF Package

The Unsaturated Zone Flow (UZF) dialog

The Unsaturated Zone Flow (UZF) Package dialog is accessed by double-clicking on the WEL 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.
  • Data – Turn on to make the Data 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:
  • Auxiliary Variables... – Click to bring up the Auxiliary Variables dialog.
  • Time Series... – Click to bring up the Time Series Files dialog.
  • Observations... – Click to bring up the Observation Files dialog.
  • AUXMULTNAME – The name of the auxiliary variable.
  • BOUNDNAMES – If turned on, indicates that the list of UZF cells will be provided with the associative boundary names.
  • PRINT_INPUT – If turned on, indicates that the list of UZF information will be written to the listing file after it is read.
  • PRINT_FLOWS – If turned on, indicates that a list of UZF flow rates will be printed to the listing file.
  • SAVE_FLOWS – If turned on, indicates that the UZF flow terms will be written to a specified file.
  • BUDGET_FILEOUT – Allows the specification of a file to which desired flow terms will be written.
  • MOVER – When turned on, indicates that the Unsaturated Zone Flow (UZF) Package, in this instance can be used in collaboration with the Water Mover (MVR) Package.
  • SIMULATE_ET – If turned on, this indicates that ET will be simulated.
  • LINEAR_GWET – If turned on, indicates that groundwater ET will be simulated.
  • SQUARE_GWET – If turned on, indicates that groundwater ET will be simulated by assuming a constant ET rate.
  • SIMULATE_GWSEEP – If turned on, indicates that groundwater discharge to land surface will be simulated.
  • UNSAT_ETWC – If turned on, indicates that ET in the unsaturated zone will be simulated as a function of the specified PET rate.
  • UNSAT_ETAE – If turned on, indicates that ET in the unsaturated zone will be simulated simulated using a capillary pressure based formulation.
• Data section – Contains the following:
  • Periods 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.
  • Add Rows – Click to bring up the Add Stresses dialog.
  • Delete Rows – Click to bring up a dialog with three options:
    • Delete from All Periods – Click to delete matching stresses from all periods.
    • Delete from Just This Period – Click to delete matching stresses from just this period.
  • Plot All Periods – Click to bring up the XY Series Editor dialog. Requires that a cell be selected in the table.
  • Open Time Series – Click to bring up the
  • Filter on Selected Cells – Click to turn on filtering on the selected cells.
  • Table – Allows the manual input of different variables for the UZF Package.
    • 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.

Auxiliary Variables Dialog

The Auxiliary Variables dialog

The Auxiliary Variables dialog is accessed by clicking Auxiliary Variables... in the Options section of many package dialogs. It is used to define an array of one or more auxiliary variable names. It contains the following sections and buttons:

• At the top is an unlabeled section listing all of the variables, one per line. Double-click on a variable name to rename it.
• Insert Row – Click to insert a row above the currently-selected row.
• Add Row – Click to add a row below the currently-selected row.
• Delete Row – Click to delete the selected row.
• Move Up – Move the selected row up.
• Move Down – Move the selected row down.

Note that each variable name must be unique. If two or more variables share a name, variables added since opening the dialog will not be saved.

Time Series Files Dialog

The Time Series Files dialog

The Time Series Files dialog is accessed by clicking Time Series Files... in the Options section of many of the package dialogs. It is used to define an array of one or more time series files. It contains the following sections and buttons:

• At the top is an unlabeled section listing all of the time series files, one per line.
  • Double-click on the first field to see the full file path and name.
  • Click Edit... to open the time series file.
• Insert Row – Click to insert a row above the currently-selected row.
• Add Row – Click to add a row below the currently-selected row.
• Delete Row – Click to delete the selected row.
• Move Up – Move the selected row up.
• Move Down – Move the selected row down.

Observation Files Dialog

The Observation Files dialog

The Observation Files dialog is accessed by clicking Observations... in the Options section of many of the package dialogs. It is used to define an array of one or more observation files. It contains the following sections and buttons:

• At the top is an unlabeled section listing all of the observation files, one per line.
  • Double-click on the first field to see the full file path and name.
  • Click Edit... to open the Observations (OBS) Dialog.
• Insert Row – Click to insert a row above the currently-selected row.
• Add Row – Click to add a row below the currently-selected row.
• Delete Row – Click to delete the selected row.
• Move Up – Move the selected row up.
• Move Down – Move the selected row down.

Related Topics

• MODFLOW 6