GMS:MF6 EVT Package

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MODFLOW 6
Models & Tools
GWF Model
Source/Sink Dialog
Zone File
Packages
Flow: GNC, HFB, NPF
Other: CHD, DIS, DRN, EVT
GHB, IC, IMS, LAK,
MAW, MVR, OBS, OC,
RCH,RIV, SFR, STO,
TDIS, UZF, WEL

The Evapotranspiration (EVT) Package dialog

The Evapotranspiration (EVT) Package dialog is accessed by double-clicking on the EVT 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.
    • PeriodData – Turn on to make the PeriodData 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-Array Series Files dialog.
    • Observations... – Click to bring up the Observation Files dialog.
    • Read as arrays (READASARRAYS) – Click to specify to use array-based input in the EVT package.
    • Do not reassign to underlying cell if cell is inactive (FIXED_CELL) – Click to indicate that evapotranspiration will not be reassigned to a cell underlying the cell specified in the list if the specified cell is inactive.
    • Use auxiliary variable as multiplier (AUXMULTNAME) – Name of auxiliary variable to be used as multiplier of evapotranspiration rate.
    • Print input to listing file (PRINT_INPUT) – Turn on to write the list of evapotranspiration information to the listing file immediately after it is read.
    • Print flows to listing file (PRINT_FLOWS) – Turn on to write the list of evapotranspiration flow rates to the listing file for every stress period time step in which "BUDGET PRINT" is specified in Output Control.
    • Save flows to budget file (SAVE_FLOWS) – Turn on to write evapotranspiration flow terms to the file specified with "BUDGET FILEOUT" in Output Control.
    • Specify petm0 (SURF_RATE_SPECIFIED) – When turned on, indicates that the proportion of the evapotranspiration rate at the ET surface will be specified as PETM0 in list input.
    • Number of ET Segments – Allows the documenting of a value that represents the number of ET segments.
      • Change... – Allows an increase or a decrease of the value within the Number of ET Segments field.
  • Periods section – Contains the following:
    • Period drop-down – Use the Increment Up and Down Increment up and down arrows.png buttons to select the desired period.
    • Define Period Add Note Icon.svg – If no period is defined, click to make the spreadsheet editable.
    • Delete Period GMS Delete Icon.svg – Click to delete the existing period.
  • Table – Contains four tabs:
    • IEVT – The layer number that defines the layer in each vertical column.
      • "UNDEFINED" – Indicates that there are no definite variables to be applied.
      • "CONSTANT" – If "Constant" is selected from the drop-down, enter a decimal value in the Constant field to be applied to all cells in the layer(s).
      • "ARRAY" – If "Array" is selected from the drop-down, enter an integer in the factor: field to be multiplied to the array after it is read.
      • "TIME-ARRAY SERIES" – Is not supported for IEVT, SURFACE, or DEPTH.
    • SURFACE – The elevation of the ET surface.
      • "UNDEFINED" – Indicates that there are no definite variable to be applied.
      • "CONSTANT" – If "Constant" is selected from the drop-down, enter a decimal value in the Constant field to be applied to all cells in the layer(s).
      • "ARRAY" – If "Array" is selected from the drop-down, enter an integer in the factor: field to be multiplied to the array after it is read.
      • "TIME-ARRAY SERIES" – Is not supported for IEVT, SURFACE, or DEPTH.
    • RATE – The maximum ET flux rate.
      • "UNDEFINED" – Indicates that there are no definite variables to be applied.
      • "CONSTANT" – If "Constant" is selected from the drop-down, enter a decimal value in the Constant field to be applied to all cells in the layer(s).
      • "ARRAY" – If "Array" is selected from the drop-down, enter an integer in the factor: field to be multiplied to the array after it is read.
      • "TIME-ARRAY SERIES" – If "Time-Array Series" is selected from the drop-down, indicate which Time-Array Series is being applied in the Series: field.
    • DEPTH – The ET extinction depth.
      • "UNDEFINED" – Indicates that there are no definite variable to be applied.
      • "CONSTANT" – If "Constant" is selected from the drop-down, enter a decimal value in the Constant field to be applied to all cells in the layer(s).
      • "ARRAY" – If "Array" is selected from the drop-down, enter an integer in the factor: field to be multiplied to the array after it is read.
      • "TIME-ARRAY SERIES" – Is not supported for IEVT, SURFACE, or DEPTH.

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 Row-insert.svg – Click to insert a row above the currently-selected row.
  • Add Row Row-add.svg – Click to add a row below the currently-selected row.
  • Delete Row Row-delete.svg – Click to delete the selected row.
  • Move Up Row-up.svg – Move the selected row up.
  • Move Down Row-down.svg – 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-Array Series Files Dialog

The Time-Array Series Files dialog

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

  • At the top is an unlabeled section listing all of the time-array 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-array series file.
  • Insert Row Row-insert.svg – Click to insert a row above the currently-selected row.
  • Add Row Row-add.svg – Click to add a row below the currently-selected row.
  • Delete Row Row-delete.svg – Click to delete the selected row.
  • Move Up Row-up.svg – Move the selected row up.
  • Move Down Row-down.svg – 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.
  • Insert Row Row-insert.svg – Click to insert a row above the currently-selected row.
  • Add Row Row-add.svg – Click to add a row below the currently-selected row.
  • Delete Row Row-delete.svg – Click to delete the selected row.
  • Move Up Row-up.svg – Move the selected row up.
  • Move Down Row-down.svg – Move the selected row down.


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