Understanding the groundwater systems in the high and low arsenic zones across the Bhagirathi-Hooghly River, India

The groundwater arsenic (As) concentrations across the Bhagirathi-Hooghly (B-H) River show contrasting spatial variability. Here, we aim to understand this variability as a function of the differences in hydrostratigraphy and the groundwater evolution on the opposite banks of the B-H River. Our results indicate a strong control of aquifer architecture, hydrogeochemistry and redox drivers on the As distribution patterns on the opposite banks of B-H River.