The Probert Encyclopaedia of General Information

BACKWASH

Backwash is the flow of water down a beach under the influence of gravity after the breaking of a wave and its associated swash. As this water returns to the breaker zone it carries beach material with it. Steep waves, which break almost vertically on to a beach, have an extremely powerful backwash and move much material out to sea. Backwash contributes to longshore drift.
Research Backwash