How to consider groundwater table in soil

Hi I am a beginner of COMSOL, I am trying to use COMSOL to model soil behaviour. As you know the soil always water in it, which make a difference of stress state, can be total stress and effective stress.

When I use Geomechanics model, there is no option for groundwater, do I need the "subsurface flow module" to make for it?

I tried to use "porous material module", but it can not show some specific geomechanics feature, such as soil plasticity, friction angle, cohesion, etc.

thank you