Abstract
An analysis of groundwater flow and transport processes of arsenic in the flow domain of the Yamuna sub-basin located in West Bengal (India) is presented. The objectives of the analysis are: to conceptualize the groundwater flow domain, to determine groundwater flow paths and groundwater velocities, to study arsenic transport in the flow domain, and to study the well captures zones. The first three objectives and issues are addressed by simulation of steady and transient groundwater flow and contaminant transport using the US Geological Survey three-dimensional finite difference code, MODFLOW, and the three-dimensional advective-dispersive transport code, MT3D. Simulated results of the calibrated model replicate the observed monthly water table conditions perfectly. Contaminant transport analysis indicates an in situ arsenic source. Using the particle tracking algorithm, MODPATH, the possibility of arsenic removal from a sample key location, and the design of wells for withdrawing arsenic-free groundwater are studied through analysis of the well capture zones.
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