ABSTRACT
Inadvertent daily use of arsenic (As) rich shallow aquifer groundwater has put many people on the edge of chronic As diseases. Management and delineation of As safe aquifers at regional scale is an urgent need in major flood plains. To manage and mitigate shallow aquifer groundwater As problem in alluvial aquifer for Brahmaputra flood plain, a conceptual model approach was used to build a numerical contaminant transport model. Hydrogeological and meteorological data, empirical formulae and soil characteristic values were used for development of a 3D transient state predictive MODFLOW and MT3DMS model. The model results showed that the computed water heads were perfectly matched with the observed hydrogeological data. This transient state MT3DMS results suggest that it can be more technically supportive and reliable method for management of sustainable groundwater source by considering different exploitation parameters to meet the increasing drinking water demands in the study area.
