Recharge zone

The area where a formation allows available water to enter the aquifer. Generally, that area where the edwards aquifer and associated limestones crop out in kinney, uvalde, medina, bexar, comal, hays, travis, and williamson counties and the outcrops of other formations in proximity to the edwards limestone, where faulting and fracturing may allow recharge of the surface waters to the edwards aquifer.


Source: Corrosion-Doctors.org