The objective of the study is to delineate ground water potential zones in Attappady Hills by using remote sensing and GIS technique. The various thematic maps such as Slope, Land use, Soil, Geology, Geomorphology, lineament and drainage density were prepared from SOI top sheets. These thematic maps have been overlaid in terms of weighted overlay method using spatial analysis tool in Arc GIS 9.3. During weighted overlay analysis, the ranking was given for each individual parameter of each thematic map and weights were assigned according to the influence of different parameters such as Land use (15), Geomorphology (11), Geology (17), Soil (16), Lineament Density (15), Drainage Density (14) and Slope (12).On the basis of this weight and ranking, the ground water potential zones of Attappady Hills have been delineated. From the present study it is observed that an integrated approach of Remote Sensing and Geographical Information System can be successfully used in delineating groundwater potential zones in the study area. In the study area four categories of ground water potential zones, viz., very good, good, poor and very poor have been demarcated. Major portion of the study area has poor and good prospect while a few scattered areas have very poor prospect. The very good potential areas are mostly concentrated in the south-eastern part of the Attappady due to gentle slope and distribution of forest cover.
