System Granularity

Hydrogeological systems can be considered at different levels from high to low, depending on the question to be answered. For example:
  • Micro - storage & permeability in the unit cube of lithology
  • Meso - behaviour into and around a borehole
  • Macro - recharge across and beyond the catchment level


System factors

  • Micro - porosity, cementation, grain size, mineral content
  • Meso - lithological sequence (vertical), depositional environment, stratigraphic & structural surfaces 
  • Macro - lithological sequence (lateral), geomorphology, superficial deposits, catchment & sub-catchment