GMS:MF6 DRN Package

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The Drain (DRN) Package dialog

The Drain (DRN) Package dialog is accessed by double-clicking on the DRN 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
    • 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.
    • Use auxiliary variable as multiplier (AUXMULTNAME) – Name of auxiliary variable to be used as multiplier of drain conductance.
    • Allow boundary names (BOUNDNAMES) – Turn on to allow boundary names to be included in the list of drain cells.
    • Print input to listing file (PRINT_INPUT) – Turn on to write the list of drain information to the listing file immediately after it is read.
    • Print flows to listing file (PRINT_FLOWS) – Turn on to write the list of drain 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 drain flow terms to the file specified with "BUDGET FILEOUT" in Output Control.
    • Use with Water Mover (MVR) package (MOVER) – Turn on to allows this instance of the Drain Package to be used with the Water Mover (MVR) Package.
  • 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.
    • 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 GMS MODFLOW 6 - Filter on Selected Cells button.png – Click to turn on filtering on the selected cells.
  • Table – Contains the following:
    • LAY – Used to specify certain layers of the module.
    • ROW – Used to specify certain rows of the module.
    • COL – Used to specify certain columns of the module.
    • ELEV – Represents the elevation of the drain.
    • COND – Represents the hydraulic conductance between the aquifer and the drain.


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