GMS:PCB Package

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The Prescribed Concentration Boundary (PCB) package is only used when there is a constant concentration boundary condition in the MODFLOW-USG Transport simulation.

A constant concentration boundary condition can be assigned to a the MODFLOW-USG Tranport model by using the MODFLOW/MT3DMS Source/Sinks dialog for either selected cells or in the conceptual model.

In the MODFLOW Prescribed Concentration Boundary (PCB) Package dialog, the Concentration can changed for any particular cell in the simulation.