Abstract
Measurements of the carbon-14 concentration of water in 33 boreholes in a saline unconfined aquifer in southern Australia have been interpreted to show that local recharge under natural conditions has a mean annual value which falls between 0.1 and 0.2 mm yr −1. The chloride concentration of groundwater is log-normally distributed suggesting that its source is rainfall. The estimate of mean annual recharge to the aquifer made using chloride is 0.25 mm yr −1.
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