The stored ground water globally is already visible using space geodesy. The Grace satellites measure the global gravity field very accurately (except for J2, which describes the oblateness of the Earth), and once everything else has been modelled out, the residual indicates changes in the continental water storage. There is an animation somewhere showing this on the GFZ (Potsdam) website. Concerning solid Earth tide, amplitudes are in the several cm to 25 cm range for vertical position displacement, pole tide is 1-2 mm level, ocean loading several mm to some cm, atmospheric loading 1-2 mm. These effects are measurable by satellite laser ranging and GNSS. The effect of the changing shape of the Earth needs to be accounted for in precise orbit modelling, so the 'static' global gravity field model is changed per point of observation, and the spherical harmonic coefficients changed by the effect of the Earth and pole tides, ocean loading etc.