Using jetting, the borehole advances using high velocity water. The jet loosens soil and flushes fine particles up to the surface. Jetting is particularly successful in sandy soils when the water table is close to the surface. Jetting is simple and dependable, requiring specially designed hydraulic jetting equipment to advance self-jetting wellpoints. This method is also used to sample the general character of a formation by examining the cuttings brought to the surface in the return flow.
The jetting method is commonly used for installing dewatering wellpoint systems and wells comprising hundreds of individual wellpoints.