Groundwater Quality Mapping Using Geographic Information System (Gis): A Case Study of Dosalavanka Watershed, Chittoor District, Andhra Pradesh, India

Abstract

Spatial variations in groundwater quality in the Dosalavanka watershed area of Chittoor
District it is located in the northern part of Andhra Pradesh State, India, have been studied
using geographic information system (GIS) techniques. GIS, a tool which is used for storing,
analyzing and displaying spatial data is also used for investigating groundwater quality
information. For this study, water samples were collected from 20 of the bore wells
representing the entire Watershed area. The water samples were analyzed for physicochemical parameters like pH, TDS, TH, Cl, So4, F,TA, and NO3
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, using standard techniques
in the laboratory and compared with the standards. The groundwater quality information
maps of the entire study area have been prepared using GIS spatial interpolation technique
for all the above parameters. The results obtained in this study and the spatial database
established in GIS will be helpful for monitoring and managing groundwater in the study
area. Mapping was coded for potable zones, in the absence of better alternate source and
non-potable zones in the study area, in terms of water quality.