GMS:MF6 DRN Package

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 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 – Contains the following:
      • 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.

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.

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