CLN Process Workflow

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For MODFLOW-USG, the Connected Linear Network (CLN) process can be used to replace wells that would use the MNW1 or MNW2 package in other versions of MODFLOW. To use the CLN process, do the following:

1. Begin with an existing MODFLOW project.
The existing model can be created using the conceptual model or grid based approach.
2. Change the simulation to use MODFLOW-USG.
  1. Select MODFLOW | Global Options.
  2. In the MODFLOW Global/Basic Package dialog, select the USG radio button.
  3. Review warning dialogs and accept changes.
3. Add CLN wells to the simulation.
1. Create a conceptual model and coverage.
1. Create new conceptual model.
  1. Use the New Conceptual Model right-click command in the Project Explorer.
  2. Use the Conceptual Model Properties dialog to create a new conceptual model.
2. Add coverages.
1. Create new coverage from scratch.
  1. Use the New Coverage right-click command.
  2. Use the Coverage Setup dialog to create a new coverage by selecting the desired coverage properties and naming the coverage.
2. Create new coverage from an existing coverage.
  1. Use the Duplicate command on an existing coverage. This will copy any feature objects on the coverage.
  2. Use the Rename command to give the coverage a new name.
  3. Change the coverage setup.
2. Import well data.
  1. Use File | Open... to open files with scatter data.
    • Alternatively, drag and drop the file into the Graphics Window in GMS.
  2. Use the File Import Wizard to specify how to import the data.
3. Set CLN map data.
  1. Right-click on the CLN wells coverage and select the Attributes Table command.
  2. Set CLN wells data in the Attributes Table dialog.
4. Map to MODFLOW.
  1. Select the conceptual model Conceptual Model Icon.svg.
  2. Select Feature Objects | Map → MODFLOW Map to MODFLOW Macro.svg.
  3. Select the appropriate options in the Map → Model dialog.
5. Review and edit CLN values.
  1. Select the MODFLOW | Optional Packages| CLN – Connected Linear Network menu command.
  2. Review and edit values in the CLN Process dialog.
  3. Select the MODFLOW | Optional Packages | CLN WEL – CLN Well menu command.
  4. Review and edit values the MODFLOW CLN Wells Package dialog.
4. Save and run MODFLOW.
  1. Save Save Macro.svg the project.
  2. Run MODFLOW Run MODFLOW Macro.svg.


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