A Ground water recharge is the use of reclaimed wastewater, by surface spreading or direct injection, to prevent saltwater intrusion into freshwater aquifers, to store the reclaimed water for future use, to control or prevent ground subsidence, and to augment nonpotable or potable ground water aquifers (USEPA, l991a).

Other definition

A ground-water recharge is inflow of water to a ground-water reservoir from the surface.

Infiltration of precipitation and its movement to the water table is one form of natural recharge. Also, the volume of water added by this process.