# iMOD User Manual version 4.4 (html)

#### 12.8KVV Vertical permeabilities

The vertical permeability (L/T) of the resistance layer between two modellayers is defined by one IDF (or a constant value). The vertical permeability is used in combination with the thickness of the resistance layer to calculate the vertical resistance between two modellayers (see Figure 12.3). The KVV vertical permeability corresponds with the HY variable specified in the MODFLOW BCF package and the VKCB variable specified in the MODFLOW LPF package.