Study on geology and hydrogeology in parts of virudhachalam taluk, cuddalore DT., Tamil Nadu, India. Karthikeyan C., Ramkumar T., Manoharan K. Dept. of Earth Sciences, Annamalai University, Annamalai Nagar -608002. Email: sckeyan@gmail.com Online published on 11 January, 2013. Abstract A hydro geological investigation was carried out in the parts of Vridhachalam taluk of Cuddalore district. As weather forecast, quality forecast also have vital importance for the management of groundwater resources. Rainfall is the chief external contributor to the groundwater storage and has influence on the quality. Manimuktha Nadhi and Vellar were mainly flowlnq in the monsoon season in the study area. The study area are chiefly comprising of fossiliferous siliceous limestone, calcareous sandstone and marl followed by a succession of black clays or shale, siliceous limestone, calcareous sandstone and shale constituting the Cuddalore series. This is followed by recent deposit consist of alluvial sediments. In the North East portion of the study area the oldest Archaean formation is underlain by the sedimentary formation. The groundwater of this area is generally colourless and odourless. EC varies from 319 to 1143 μ/cm, the pH is 6.9 to 8.3, neutral to alkaline. The values of TDS and EC in most of the sites indicating the higher ionic concentration. Based on the analysis certain parameters like Sodium Adsorption Ratio (SAR), Percent sodium, Residual Sodium Carbonate (RSC), Magnesium hardness were calculated. From the evaluation it is known that the water quality is suitable for both domestic and irrigation purposes. Assessments of water samples from various methods proved that majority of water samples are good either for drinking or for agriculture in all seasons. Top Keywords Archaean, Cretaceous, Siliceous limestone, Tertiary formations, Alkalinity, Semi-confined. Top |