• Dr.K.RAMESH
• Dr.E.Jamuna

: Groundwater survey is an important process for determining its suitability for various uses in daily human life by measurement of its physical and chemical characteristics. The present study is aimed to establish the water quality of shallow well and bore well in and around some parts of Minjur block, Tiruvallur district, Tamil Nadu. Totally, 26 groundwater samples were collected randomly from wells during the pre-monsoon (PRM) in September 2019 and for post-monsoon (POM) in January 2020. Major ions were analyzed according to APHA standards and compared with BIS standards. In coastal aquifers, the extraction of groundwater by over pumping leads to seawater intrusion. The consequent over extracting of groundwater and sea water intrusion has also grown to be a major issue in the in Minjur block which has in turn, affected the agricultural cultivation and livelihood of many farmers and residents. Water of almost all study area is hard to very hard and also increase concentration of EC and other parameters in groundwater. Abundance of these ions are in the following order Na>Ca>Mg>K and Cl> HCO3>SO4>NO3.The Hydro chemical facies also show that the Na-Cl water type is predominant in most parts of the study area. Higher concentrations ions are seen in the eastern part of the study area and are comparatively very low in the western part, thus the concentration of ions is increasing from eastern to western parts. High value of EC in the groundwater is due to sea water intrusion. Generally, the deep water is harder than the shallow water. Based on these parameters, groundwater had been assessed and was not suitable for drinking and irrigation purposes. From this study, it is inferred that groundwater is undergoing quality deterioration near coastal areas. The study concludes the migration of sea water intrusion into the land and avoids overexploitation of groundwater to future development.

Shallow and deep wells, Physio-chemical parameters, water quality index, irrigation water quality.

"Groundwater quality Monitoring in Shallow and Deep coastal aquifers of Minjur block, TN", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 11, page no.e278-e289, November-2022, Available :http://www.jetir.org/papers/JETIR2211448.pdf

"Groundwater quality Monitoring in Shallow and Deep coastal aquifers of Minjur block, TN", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 11, page no. ppe278-e289, November-2022, Available at : http://www.jetir.org/papers/JETIR2211448.pdf