The various MT3DMS and MT3D-USGS packages can be selected on the can be selected in the MODFLOW Packages and Programs dialog box. These packages are:
•Basic Transport Package (BTN)
•Sink & Source Mixing Package (SSM)
•Chemical Reactions Package (RCT)
•Generalized Conjugate Gradient Solver (GCG)
•Transport Observation Package (TOB)
•Contaminant Treatment Systems (CTS)
•Stream Flow Transport Package (SFT)
•Unsaturated-Zone Transport Package (UZT)
The BTN and GCG packages are always used in MT3DMS.
Additional data related to MT3DMS are specified in the MODFLOW Layer Groups, the MODFLOW Time, the MODFLOW Output Control, the Manage Flow Observations , and the Contaminant Treatment Systems dialog boxes.
The Lake, Stream-Flow, and Unsaturated-Zone Transport packages in MT3D-USGS can only be used if the flow model is a MODFLOW-NWT model.
