# iMOD User Manual version 5.2 (html)

#### 12.4KDW Transmissivity

The transmissivity (L${}^{2}$/T) of each modellayer is defined by one IDF (or a constant value). Alternatively the transmissivity of a modellayer may be defined by the product of the horizontal permeability defined in the KHV package and the layer thickness derived from the TOP and BOT package (see figure 12.3). The KDW transmissivity corresponds with the TRAN variable specified in the MODFLOW BCF package.