The video includes brief calculation made for cantilever and counterfort wall.
In the counterfort retaining wall, the step and the base slab are connected unitedly with counterforts at proper gaps.
As a consequence of provision of counterforts, the vertical stem together with the heel slab performs as continuous slab, contrary to the cantilevers of cantilever retaining wall.
They are inexpensive for height in excess of about 6 m.