"enhancement" not supported.
Für artificial groundwater 'enhancement' gibt es keinen Google-Treffer, aber artificial groundwater 'recharge' wird mehrfach bestätigt, z.B.:
Southern Nevada Water Authority - http://www.snwa.com/html/help_glossary.html
"Artificial Groundwater RechargeThe process of injecting treated water through a well into the groundwater. Artificially recharged groundwater is measured and recorded as banked groundwater recharge, which can be recovered at a later time.
Banked Groundwater Rechargewater that has been stored temporarily in the groundwater aquifer through a program of artificial groundwater recharge."
The use of artificial groundwater recharge for producing high quality drinking water is increasing in Finland. At the moment 10 % of water used in Finland is artificially recharged groundwater, and by 2010 it is estimated to account for over 20 % of the total water use. The intention of this artificial recharge is to produce groundwater that is similar to natural groundwater.
Folgender Link (und etliche mehr) rechtfertigen eine Neueintragung 'groundwater recharge' = Grundwasserneubildung: http://groundwater.orst.edu/under/images/rech...
(Auch für die deutsche Seite 'Grundwasserneubildung' gibt es viele gute Google-hits.)
"Rain fall and snow melt canor run off in streams or soak into the ground The process of water soaking into the ground to become groundwater is known as groundwater recharge. The area on the surface where water soaks in is called the recharge area."