The present study is concerned with the development and test of an integrated remote sensing and GIS based
methodology for identification of groundwater potential areas in a humid tropical river basin. Indian Remote
Sensing Satellite (IRS 1C-LISS-III) data along with other collateral data such as existing maps and field
observations was utilized to extract information on the hydro-geomorphic features of the terrain. The study
involves two components: (a) demarcation of groundwater potential zones (b) validation of sites with yield data.
In order to demarcate potential groundwater zones, six pertinent thematic layers were integrated and assigned
appropriate rankings. Layers considered were: geology, geomorphology, drainage density, slope, rainfall with
infiltration factor and land cover map. The layer parameters were also rated according to their importance
relative to other classes in the same theme. All the layers were superimposed and analyzed in ARC GIS environment. A linear additive model based on the DRASTIC model concept was used to find the groundwater
potential index (GPI). The map comprised of six categories of groundwater yield. To carry out more focused
investigations on the potential zones, lineament maps were superimposed over it. The validity of different
potential zones identified using the GIS-based model was compared with available borewell yield data and
found to be in good agreement. The map generated can be used in future as a preliminary screening tool in
selecting well sites and as a basic tool in land use planning for groundwater protection.