Hydraulic action is erosion that occurs when the motion of water against a rock surface produces mechanical weathering. Most generally, it is the ability of moving water (flowing or waves) to dislodge and transport rock particles. Within this
rubric are a number of specific erosional processes, including
abrasion, attrition,
corrasion, saltation, and scouring. Hydraulic action is distinguished from other types of water facilitated erosion, such as
static erosion where water leaches salts and floats off organic material from unconsolidated sediments, and from
chemical erosion more often called
chemical weathering. It is a mechanical process, in which the moving water current flows against the banks and bed of a river, thereby removing rock particles.