GMS:MF6 LAK Package

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The Lake (LAK) Package dialog

The Lake (LAK) 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:
  • Options section – Temporal options and settings:
    • BOUNDNAMES – If turned on, indicates that the list of lake cells will be provided with the associative boundary names.
    • PRINT_INPUT – If turned on, indicates that the list of lake information will be written to the listing file after it is read.
    • PRINT_STAGE – If turned on, indicates that lake stages will be printed to the listing file for each stress period if "HEAD PRINT" is specified.
    • PRINT_FLOWS – If turned on, indicates that a list of lake flow rates will be printed to the listing file.
    • SAVE_FLOWS – If turned on, indicates that the lake flow terms will be written to a specified file.
    • STAGE FILEOUT – Indicates that the record corresponds to a specific stage. Also allows the written indication of stage information.
    • BUDGET FILEOUT – Allows the specification of a file to which desired flow terms will be written.
    • NO_WELL_STORAGE – If turned on, indicates that well storage will not be included in the continuity equation. It is used to control discharge rate oscillations.
    • SURFDEP – When turned on, allows the a written value that defines the surface depression depth of the lake.
    • MOVER – When turned on, indicates that the Lake (Lak) Package, in this instance can be used in collaboration with the Water Mover (MVR) Package.
    • TIME_CONVERSION – Value that is used in converting outlet flow terms into time units.
    • LENGTH_CONVERSION – Value that is used in converting outlet flow terms into length units.
  • Data section – Contains the following:
    • Periods 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.
    • Add Rows Row-add.svg – Click to bring up the Add Stresses dialog.
    • Delete Rows Row-delete.svg – 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 Mf6time-series.svg – Click to bring up the XY Series Editor dialog. Requires that a cell be selected in the table.
    • Open Time Series Open Macro.svg – Click to bring up the
    • Filter on Selected Cells Mf6filter.svg – Click to turn on filtering on the selected cells.
  • Table – Allows the manual input of different variables for the MAW Package.
    • 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.


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