An Approach To Demarcate Ground Water Potential Zones Through Remote Sensing And GIS J Krishnamurthy DEPARTMENT OF GEOLOGY, SCHOOL OF GEOSCIENCES, India Email: drmm_bdu@yahoo.co.uk, V.Jayaraman DEPARTMENT OF GEOLOGY, SCHOOL OF GEOSCIENCES DR.M.Manivel DEPARTMENT OF GEOLOGY, SCHOOL OF GEOSCIENCES M.S.P.Muthu DEPARTMENT OF GEOLOGY, SCHOOL OF GEOSCIENCES In order to demarcate the ground water potential zones of Marudaiyar basin different thematic maps such as, lithology, landforms, lineaments and surface water bodies at a 1: 50000 scale were prepared, using Remotely-sensed data as well as drainage density and slope classes from Survey of India topographical sheets. In addition, a soil map at 1: 50000 scale covering the study area was genera1ed from a 1: 250 000 scale soil map prepared by the Soil Survey and Land use Organization by regrouping the soil types based on their hydrological characteristics. All the thematic layers were integrated and analyzed using a model developed with logical conditions in the geographical information system (G IS). The ground water potential zones map generated through this model was verified with the yield data to ascertain the validity of the model developed. The verification showed that the ground water potential zones demarcated through the model are in agreement with the bore well yield data collected in the field. Since the Present approach was built with logical conditions and reasoning, this approach can be successfully used elsewhere with appropriate modifications. Thus, the above study has clearly demonstrated the capabilities of remote sensing technique and GIS in demarcation of the different ground water potential zones, particularly in such a diverse geological set up.