The hydrologic significance of spatial variability and anisotropic permeability in
fault zones has been studied through two sets of numerical experiments using a
integrated model of fracture network model and porous medium model. The steady-state
flow conditions were established for specific fluid flow and hydraulic head boundary
conditions, after which particle migration was tracked through the model domain from
the repository to the model boundaries. The first set is for a fractured rock mass
overlain by an impermeable cover rock, and second set by a permeable cover rock. The
particle travel paths and residence times were compared for different fault zone
configurations.