eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences December 2010 22 3 519 532 juc 926 article Karthikeyan. A. 1 Senthil kumar. G.R. (senthikumar@rediffmail.com 1 Department of Earth Sciences, Annamala University, Ammamalai Nagar (T.N.) 608002 (NDIA) <p style="text-align: justify;">The study area, part of Tindivanam taluk in Villupuram district is located between 79&deg;30&#39; to 79&deg;52&#39; east longitude and 12&deg;18&#39; to 12&deg;24&#39; north latitude. The study area consists of granite, granitic gneiss, and Charnockite of Archaean age which are with few intrusions by dolerite dyke and pegmatite. Ground water sample of 50 locations have been collected in two different seasons (pre and post monsoon). The collected samples have been analysed, and the analytical results brought into a digital output using a computer program HYCH. From the digital output, thematic maps such as Total Dissolved Solids, Total Hardness, Corrosivity Ratio, Groundwater Classification and Salinity and Sodium Hazard have been prepared using the GIS environment. It is inferred that the quality of groundwater improves unevenly in different locations with respect to season indicating the recharge is not uniform. An appreciable amount of quality improvement has been observed along the northern and central portion of the study area. The quality improvement in north of the Veedur dam is poor. Groundwater collected from this location during post monsoon show a little reduction in TDS, TH, CR and USSL classification. It is suggested that by constructing large number of artificial recharge structures to trap monsoon rainwater along the northern and central part of the study area will improve the quality of groundwater remarkably. Designing of recharging wells along the southern region will result in considerable improvement both in the quality and quantity of groundwater.<br /> &nbsp;</p> https://ultraphysicalsciences.org/paper/926/ Digital output, thematic maps artificial recharge recharge structures.