To be asked this question you must be studying some subject.
Different subjects approach this in different ways so is this a question in
Chemical Engineering/Soil Mechanics
Equally you must have been given a definition and statement of these equations
So what have you been told?
Groundwater flow is often treated as potential flow.
This can be approached by complex analysis (conformal mapping) or using partial differential equations.
Do you understand this term?
Geologically speaking transport phenomena apply to suspensions, mixed sediments and even small pebbles as well as true solutions.
You also have the difference between saline and fresh water and mixing phenomena to consider.
Groundwater considerations in Civil Engineering include pressures on retaining walls and foundations, and the issue of active and passive pressures.
As I said before, pure solutions are treated as just other (different) liquids in both porous media and bulk fluid dynamics.
You didn't even ask what I meant by pores!
Chemical Engineers and Geologists may be interested in the reactions of such solutions with the transmission medium eg acid groundwater in limestone regions.
So that's over 20 lines of text I have put into your problem so far, to your 2.