ASSESSMENT OF GROUNDWATER QUALITY PARAMETERS THROUGH SPATIAL DISTRIBUTION MAPPING USING GISR. Lilly and G. RavikumarAbstract The work aims to compare the spatial distribution of water quality parameters to determine the water quality scenario before and after the construction of Chennai metro rail. Ten observation wells are identified in and around Chennai metro rail corridor. Data on water quality parameters are collected for a period of 1995-2014. Since the construction of Chennai metro rail was started in the year 2008, the spatial distribution analysis using Geographical Information System (GIS) is carried out in two phases with the mean values of water quality parameters such as pH, Electrical conductivity, Total Dissolved Solids (TDS), Total hardness, Calcium, Magnesium, Total alkalinity, Chloride, Fluoride, and Sulphate before (1995-2008) and after (2009- 2014) the construction. The spatial distribution mapping is compared to predict the variations of the water quality parameters concentration in ground water before and after the construction of the metro rail corridor.
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