Kazi Matin Ahmed

TL;DR: Observations show that adjacent sediment grain-size and how recently a pond was excavated influence the how much fecal contamination ponds receiving latrine effluents contribute to neighboring groundwater.

TL;DR: The results of the study clearly indicate geological control (i.e. change in lithofacies) on groundwater chemistry and distribution of redox-sensitive elements such as As along the transect as discussed by the authors.

TL;DR: Transboundary regional-scale models for computing the probability of groundwater As concentrations to exceed the WHO permissible thresholds for drinking water within the Ganges River delta as a function of the various geomorphologic-(hydro)geologic-hydrostratigraphic-anthropogenic controlling factors are developed and useful in identifying the possible exogenous forcing that may have led to the worst, natural pollution in human history.

TL;DR: A conceptual model of arsenic in the aquifer is proposed in this paper, as a basis for addressing questions concerning sustainability of groundwater development, which incorporates the conditions of arsenic release to groundwater, the depth distribution of the arsenic source, likely sedimentological controls on the lateral discontinuity of the source, and the hydraulic regime imposed by pumping from the hydrogeologically leaky, multi-layered aquifer.

TL;DR: A simple flushing model shows that the increase in As concentrations with depth and groundwater age at this site, and at other sites in the Bengal and Red River Basins, can be attributed to the evolution of the aquifer over 100-1000 years as aquifer sands are gradually flushed of their initial As content.