A Study on Groundwater Quality and Spatial Distribution of Gandarvakottai Taluk by Using GIS

Abstract

The present study investigates the hydro geochemical characteristics of groundwater quality in Gandarvakottai Taluk of the pudukottai district, Tamil Nadu, India. The Secondary data were collected from the CGWB office Chennai, tharamani during pre-and postmonsoon periods of 2010. The groundwater quality assessment has been carried out by evaluating the physicochemical Parameters such as pH, EC, TDS, HCO3-, Cl-, SO4, Ca2+, and Mg2+ for both the seasons. Based on these parameters, groundwater as been assessed in favour of its suitability for drinking and irrigation purpose. Dominant cations for Pre and Post the seasons are in the order of Na+ > Mg2+ > Ca2+ >K, and Mg2+Na+ >Ca2+>K while the dominant anions both post monsoon and pre monsoon have the trends of HCO3 ->Cl- >CO3>Fl-, respectively. Analytical results observed from various indices reveal that the groundwater quality is good in some places recently polluted by the waste materials. The observed chemical variations in pre-monsoon and postmonsoon seasons may be the effect to rock-water interactions, ion-exchange reactions, and runoff of fertilizers from the surrounding agricultural lands.