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Theory Manual Version 3.6
 Section 5.9: Hydraulic Permeability Up Section 5.9: Hydraulic Permeability Subsection 5.9.2: Exponential Isotropic Permeability 

5.9.1 Constant Isotropic Permeability

When the permeability is isotropic, For this material model, is constant. Generally, this assumption is only reasonable when strains are small.
 Section 5.9: Hydraulic Permeability Up Section 5.9: Hydraulic Permeability Subsection 5.9.2: Exponential Isotropic Permeability