The CNC: GWT Constant Concentration Package pane is used to activate the Constant Concentraton package. It is on the MODFLOW Packages and Programs dialog box under Groundwater Transport| | GWT: Groundwater Transport.
"Multipliers" can be used with CNC boundaries. Multipliers will be used if the "Use Multiplier" checkbox is checked.. Ordinarily, multipliers are not needed. If multipliers are used, the concentration is multiplied by the value of the multiplier. One use for multipliers might be when the concentrations are defined using a time-series and it is desired to multiply the concentration values in the time series by a different amount at different locations.
