Artificial Recharging of Ground Water Resources Experience in Well Field “Baltezers” (Latvia)

In several well fields in the region Baltezers the Quaternary shallow groundwater with artificial groundwater recharge system is used For Riga city water supply. A Hidrogeological modelling and field investigation was done to asses the risk for groundwater quality and for optimisation of the system of artificial recharge of groundwater resources. Detailed investigations shows, that Steady state HM cannot provide information needed for elaboration of optimal recharge rates and method of controlling them, the transient HM of the Baltezers well fields must be used for those purposes. Artificial recharging of groundwater resources in the Baltezers region does not make risk for groundwater quality to exceed permitted parameters’ values for drinking water, and make substation contribution to protect groundwater quality from possible contamination from new urban territories in NW from the siphon lines in Baltezers region