Evaluation of Groundwater Quality in Virudhunagar Taluk, Tamil Nadu, India by using Statistical Methods and GIS Technique

In the present study, twenty water samples were collected during pre-monsoon (June 2017) and post-monsoon (December 2017) seasons. The water samples were analyzed to determine various chemical parameters like chloride, fluoride, sulphate, nitrate, phosphate. During pre-monsoon (PRM) and post-monsoon (POM) the order of dominance of anion in the water samples are HCO 3 − > TDS > Cl − > SO 4 2− > TH > NO 3 − > F> PO 4 − and TDS >HCO 3 − >SO 4 2− >Cl − > TH >NO 3 − >F − >PO 4 − , respectively. The order of dominance of cations are Na + > Ca 2+ > Mg 2+ > K + in both the seasons. The irrigation water quality was determined using the parameters such as sodium absorption ratio (SAR), Kelly’s ratio (KR), residual sodium carbonate (RSC), potential salinity (PS), permeability index (PI), sodium percentage (SP), magnesium hazard, calcium to magnesium molar ratio. The groundwater’s geochemical control and hydrogeochemistry were evaluated using the Piper, Chadha, scatter and Gibbs plots. This study reveals that groundwater quality is unfit for drinking purposes at a few places in the study area.