The IST: Mobile Storage and Transfer Package pane is used to activate the Immobile Storage and Trnasfer package. It is on the MODFLOW Packages and Programs dialog box under Groundwater Transport| | GWT: Groundwater Transport.
Each transport model can have multiple Immobile Storage and Trnasfer packages but they all use the same options. The Immobile Storage and Trnasfer package can store budget information in either a binary file, a comma-separated value (CSV) file or both.
Sorption with a linear sorption isotherm can be simulated. If sorption is simulated in the IST package it must also be simulated in the MST package using the linear option.
Decay can be simulated as either zero-order or first-order decay.
