Kerala, southwestern Peninsular India, is having a unique hydrogeological and climatic condition. The state experiences a wide regional variability in rainfall (average 3107 mm) from eastern hilly areas to the western coastal plain and a major part of the rainfall goes as surface run off particularly during monsoon season. The steady base flow from the groundwater emerges as surface run off during the non-monsoon periods. A realistic estimation of surface/ groundwater and other related information for each watershed are needed to mitigate water scarcity, water quality and ecological problems in the state.

Scientific management of groundwater resources requires studies relating to hydrogeology, hydrometeorology, hydrochemistry, geophysics and remote sensing. All management policies for water resources, before the onset of remote sensing techniques, have crippled by the limitations of conventional methods used in resources survey and monitoring. The effective management of groundwater resource can be done only when there is an adequate knowledge about its spatial and temporal distribution. Thus remote sensing techniques give a new dimension to the effective management by satisfying the primary need and helps in real time analysis of such scare and valuable resources. This can be substantiated by studies like resources evaluation with the aid of remote sensing. Time bound conventional data and real time remotely sensed data are compared and correlated to produce the most exciting results for conservation, optimum utilization and management of the resources.