Ground water is a major source of fresh water supply. The identification of good quality ground water sources is required for tapping those sources for distribution to public. The research work presented in this paper focused on the preparation of a spatial distribution map for quality of ground water in Neelambur, based on physio-chemical quality. 24 points within the study area were identified for ground water sample collection. Laboratory test was performed to identify the values of 9 water quality parameters namely Potential Hydrogen (pH), Iron (Fe), Nitrate (NO3-), Sulphate (SO42-), Total Dissolved Solids (TDS), Sodium (Na), Potassium (K), Total Hardness (TH) as CaCO3 and Phosphate (PO43-). The laboratory test results were used in the Geographic Information System (GIS) and the individual thematic maps for the water quality parameters were prepared using the Inverse Distance Weighted (IDW) interpolation method. The spatial ground water quality map for the study area was prepared using the criteria weights determined by Analytical Hierarchy Process (AHP) and weighted overlay analysis in GIS. The overlay analysis results indicated that 61.8% of the study area covering 4.6sq.km was having the ground water of medium to high quality which can be used as the sources of ground water for public distribution.
Ground water, Spatial distribution, GIS, AHP, Weighted overlay, IDW.
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