The Time-Varying Hydraulic Conductivity Package is used to specify time-varying values of hydraulic conductivity at individual cells. The TVK: Time-Varying Hydraulic Conductivity Package pane is on the MODFLOW Packages and Programs dialog box under Flow Packages. Time-Varying Hydraulic Conductivity Package is documented in chapter 6 of mf6suptechinfo.pdf distributed with MODFLOW 6.
