Hi All, I am in the planning phase for a groundwater flow model of an underground mine dewatering project to evaluate mine inflows and effect on water resources in the area of the proposed mine. The mine plan consists of using paste backfill throughout all of the stopes. It is estimated that the hydraulic conductivity of the paste back fill will be 2-3 orders of magnitude lower than the native rock (storage will also change). I have worked with models that implement changing material properties by use of cascading models (export heads from transient model run, change material properties and r