 The phreatic zone size, color, and depth may fluctuate with changes of season, and during wet and dry periods.Depending on the characteristics of soil particles, their packing and porosity, the boundary of a saturated zone can be stable or instable, exhibiting fingering patterns known as Saffman–Taylor instability.Predicting the onset of stable vs. unstable drainage fronts is of some importance in modelling phreatic zone boundaries.