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Delineating low-arsenic groundwater environments in the Bengal Aquifer System, Bangladesh |
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| Authors: | MA Hoque WG BurgessM Shamsudduha KM Ahmed |
| Institution: | a Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom b Department of Petroleum and Georesources Engineering, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh c Department of Geography, University College London, Gower Street, London WC1E 6BT, United Kingdom d Department of Geology, University of Dhaka, Dhaka 1000, Bangladesh |
| Abstract: | Studies within the As-affected Bengal Basin have indicated that low-As groundwater can be found in a variety of geological and geomorphological settings. The hydrogeological environments that host low-As groundwater may be interpreted within a geological framework determined by the Quaternary evolution of the Bengal Aquifer System (BAS). This provides the basis for delineating the position and extent of shallow low-As groundwater, low-As groundwater in oxidised ‘red-bed’ sediments, and deep low-As groundwater. Data available on a national scale allow a preliminary delineation of these low-As groundwater environments across Bangladesh, based on empirical associations of low-As groundwater occurrences with topography, water table elevation, surface sediment lithology, geology and the screen depth of deep wells in low-As zones. |
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