Spatial Distribution of Groundwater quality in Paravanar River Sub-Basin, Cuddalore District, Tamil Nadu

The present investigation reports the results of a monitoring study focusing on groundwater quality of Paravanar River Subbasin, Cuddalore District of Tamil nadu. Since, remediation of groundwater is very difficult, knowledge of the existing nature, magnitude, and sources of the various pollution loads is a prerequisite to assessing groundwater quality. Thirty five groundwater samples were collected randomly from Bore wells and analyzed for various chemical parameters. Geologically, the study area comprises Quaternary alluvium made up of an alternating succession of clay, silt and sandstone deposits. An attempt has been made to study on the quality of ground water for the Villages falling in the Paravanar Sub Basin to interpolate major ions concentration in groundwater. Highest concentration of hardness in groundwater is observed in Kulakudi. Abundance of Caco3 hardness may be attributed due to dissolution of aragonite bearing minerals by the way of pedological differenceaction in the preceding sedimentary cycle of deposition. Maximum concentration of No3 above 100ppm which is more than European drinking water standard is found to occur in SE and E part of the study area which comprises of recent alluvium. Above zones were found to put for maximum agricultural operation by applying Verm icomposit for crop production in the study area.