STUDY OF SEAWATER INTRUSION IN A COASTAL AQUIFER BY HYDROCHEMICAL METHOD ? A REVIEW.

With two thirds of the earth's surface covered by water and the human body consisting of 75 percent of it, it is evidently clear that water is one of the prime elements responsible for life on earth. Water plays an important role in the field of agriculture, industries and domestic. In this concern about 70% of world?s population lives in coastal region. One of the major factor most commonly encountered in coastal aquifers is the induced flow of saltwater into freshwater aquifers caused by groundwater over pumping known as Saline water intrusion or Seawater intrusion (SWI). It is the landward migration of sea water into freshwater coastal aquifers. This study review is focuses on the SWI vulnerability which were studied by hydrochemical analysis in the coastal aquifers. The water quality is depends upon the chemical parameters such as pH, Electrical conductivity (EC), Total Dissolved Solid (TDS), chloride and Total alkalinity etc., The review shows that all the water quality chemical parameters are considered as per the standards of APHA. Hence it can be concluded that in post-monsoon period the water level gets lowered which reduces the water quality. This mainly leads to seawater intrusion to certain extent. The chemical parameters were analysed in various research works and it is concluded with certain range of values.