Well, obviously GIS can be ...

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Well, obviously GIS can be used to visualise and/or perform some analysis (like interpolation) of GW quality given the availability of data, however, why use GIS when there are more specialised hydraulic models out there with wider functionality (compared to GIS) that may be used, not only for visualising, but for simulating flow of GW contamination in both 2D and 3D (based on physically proven mathematical models) and produce output in a form that is native to water experts.