Integrated Approach on Identifying Groundwater Potential Zone in Kallar River Basin, Thiruvananthapuram, Kerala

Water is a vital natural resource which is indispensable for the existence of all living matter, plant, animal and man (Ullah et al, 1972). Sufficiently thick weathered zone forms groundwater storage in bedrock areas but often may not provide regular supply of groundwater. The conventional approaches on groundwater investigation are ground based surveys and exploratory drilling which are time consuming and uneconomical. Hence an integrated approach of remote sensing and GIS can help to demarcate groundwater potential zones in hard rock areas more easily and with accuracy (Neelima et. al, 2014). The present study has been conducted in Kallar River (41 Km length) basin in Nedumangad Taluk, Thiruvananthapuram District of Kerala. Survey of India Toposheet (1:25,000), Geological Survey of India maps, Google Terrain map, Google Satellite image downloaded from Google earth web application, Soil Map etc., have been adopted to generate various thematic layers. Multi criteria analysis has been adopted for weighted layering in GIS Platform and the final result will evolve to depict the groundwater potential zone in Kallar River basin.