7.1. Permeability
In this section, permeability property values are assigned to grid points within geometries (specified in §6.1.4 Geometries above) using one of the methods described below. Permeabilities are assumed to be a diagonal tensor with entries given as,
\[\begin{split}\left(
\begin{array}{ccc}
k_x({\bf x}) & 0 & 0 \\
0 & k_y({\bf x}) & 0 \\
0 & 0 & k_z({\bf x})
\end{array} \right)
K({\bf x}),\end{split}\]
where \(K({\bf x})\) is the permeability field given below. Specification of the tensor entries (\(k_x, k_y\) and \(k_z\)) will be given at the end of this section.
The random field routines (turning bands and pgs) can use conditioning data if the user so desires. It is not necessary to use conditioning as ParFlow automatically defaults to not use conditioning data, but if conditioning is desired, the following key should be set.