- Do the equations for groundwater flow contain terms representing the density of water in the soil?
As I understand Darcy's law, it computes the flux of water through an area. The same value of flux can be the realized by different combinations of a density of water in the soil and the velocity of that water. So. as far as I can see, Darcy's law is ambiguous about which combination of density and velocity occurs. Is that a correct interpretation? Are there other equations that deal with the density and velocity?