1. For the wells in the Group 1: Non-RBF, the standard deviations of ? 2 H all fall below 1 � vs V-SMOW, which is consistent with the absence of seasonal variation of the tracer. For the wells in the Group 2: Permanent RBF, the standard deviations of ? 2 H all fall above 1 � vs V-SMOW, and under 25 ?S/cm. For the wells in the Group 3: Occasional RBF, the standard deviations of ? 2 H fall above 1 � vs V-SMOW, and above 25 ?S/cm, except for one site which is under 25 ?S/cm. Our method assumes regional groundwater signal to be constant on an annual scale. As the EC in the pumping wells is also controlled by yearround surface water inputs and influenced by pumping regimes;the 4 surface waters studied, standard deviations of ? 2 H and CE are relatively similar for RDN (5.9 � vs V-SMOW; 104 ?S/cm), CHE (6.1 � vs V-SMOW; 152 ?S/cm), and NIC (8.4 � vs V-SMOW; 92 ?S/cm)
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