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