In this study, Weighted Index Overlay Analysis (WIOA) approach for easy assessment of groundwater potential is adopted for GIS integration of thematic layers developed from the Remote Sensing data. In addition, the advantage of using remote sensing techniques together with GPS in a single platform and integration of GIS techniques facilitated better data analysis and their interpretations. The integration of remote sensing and GIS has proven to be an efficient tool in groundwater studies, ,, where remote sensing serves as the preliminary inventory method to understand the groundwater conditions and GIS enables integration and management of multi-thematic data. GIS techniques facilitate integration and analysis of large volumes of data, whereas, field studies help to further validate results. In the recent years, modern technologies like Geographic Information System (GIS) is being used for various purposes such as groundwater investigations and many authors have attempted to delineate groundwater potential zones. Excellent reviews of remote sensing applications in groundwater hydrology are presented in Farnsworth et, Waters et and Engman and Gurney, which concluded that remote sensing has been widely used as a tool. Its advantages of spatial, spectral and temporal availability of data have proved to be useful for quick and useful baseline information about the factors controlling the occurrence and movement of groundwater like geology, geomorphology, land use/ land cover, drainage patterns, lineaments etc. In recent years, satellite remote sensing data has been widely used in locating groundwater potential zones. Remote Sensing is an excellent tool for researchers in understanding the bewildering problems of groundwater exploration. Hence, the delineation of groundwater potential zones has acquired great importance. It may be noted that not only its demand has increased over the years but it seems that the demand will The available surface water resources are inadequate to meet all the water requirements for various purposes. Due to the increasing of population, urbanization, deforestation and industrialization pressure on this resource is alarmingly increasing. Groundwater is mostly preferred to meet this growing demand because of its lower level of contamination and wider distribution. In the recent years enormous increased the demand for good quality water in the agricultural, industrial and domestic sectors to meet the growing needs. In that ground water is most significant natural resource which supports both human needs and economic development. Globally its availability is only 3% in the form of Icecaps and glaciers (68.7%), Groundwater (30.1%) and other forms (0.9%) like water vapor in the atmosphere. So, we cant imagine a world without water!!. Keywords Groundwater, Remote Sensing and GIS, Weighted Index Overlay, KOMPSAT, LANDSAT ETM+, ArcGIS, ERDASД¬ompetition over freshwater resources has been increasing during a few decades due to the over growth of population, economic development, increased demand for agricultural products for both food and non-food use. The delineated groundwater potential zones have been validated with the open wells in the study area. For the extraction of thematic layers and analysis ,the ArcGIS 9.3,1 and ERDAS Imagine 9.1 softwares have been used for delineating the groundwater potential zones. All the thematic layers have been extracted from the existing data, KOMPSAT and LANDSAT ETM+ satellite data. In this research the following thematic layers have been taken which include Land use/Land cover, Geomorphology, Geology, Soil, Drainage density, Lineament density, Lineament frequency and Lineament Intersection. But in this research, a detailed approach have been given for weightage calcultions for various thematic layers considered. Many of the researchers have not been given weightage calcualtions for the thematic layers they considered in their research. Delineation of Groundwater Potential Zones using Remote Sensing and GIS Techniques: A Case Study of Sarada Gedda Sub WatershedДЄbstract In present days many researchers have delineated groundwater potential zones using Remote Sensing and GIS techniques by the Weighted Index Overlay Analysis (WIOA) for various geographic regions of the world.

Erdas imagine 9.1 2015