Tidal Forces 
Equilibrium theory makes the following assumptions:

Tidalpotential can be determined from celestial mechanics

Oceans of uniform depth cover the earth

The earth is not rotating, so no Coriolis force acts

No friction acts
Given these assumptions, equilibrium theory predicts a maximum tidal range of 0.5  1 m.
Dynamic theory takes the earth's true nature into account:

Earth is rotating

Continents exist

Bathymetry is highly irregular

Friction acts

Tides are long waves (highest frequency harmonics are semidiurnal) so they behave as shallowwater waves
The dynamic theory doesn't perfectly predict tides either, but it provides a much better explanation for observed tidal patterns. The most accurate method of tidal predication (near coasts, at least) is to carefully measure tides over an extended period, and use harmonic analysis. 