Ashok D Hanjagi has completed his PhD at the age of 27 years from Karnataka University and Postdoctoral Studies from Bangalore University, Bangalore. He is Chief Editor of two international journals of Geographical Analysis and Geo-eye. He is also the Chief

Secretary of Union of Geographic Information Technologist (UGIT) and Coordinator of UGC SAP DRS –II. He delivered many talks in Regional TV Channels. He has delivered 15 Keynote addresses. He has guided 8 PhD and 2 PDFs. He has 21 years of teaching & research experience and published 75 research papers at reputed journals at national and international level. He is a member of Karnataka state water policy.

Sustainable water use is the use of water in a fashion that does not harm the essential functions of the hydrological cycle or the ecosystem on which present and future humans depend. For most of the poorer section of Karnataka, the search for safe drinking water is a daily challenge. Huge population depend on water resource for their socio-economic development, survival and welfare which created pressures in their streams, rivers, lakes, and aquifers. Use of

water increased in Karnataka state, due to growth of population, urbanization, intense agriculture, economic development and changing consumption pattern. Agriculture is the main occupation in Karnataka and for about 70% of the agriculture is rain fed. The main

objective of the research is to evaluate the existing situation of the state in terms of its water resources and suggest scientific method to restore in Karnataka. Geospatial technologies have been used and estimated the spatial variation of the water resource in the state. Survey of India (SOI) topomaps, field data, multitemporal satellite data have also been applied for the analysis of sustainable resource management in the state. Karnataka state rivers basin delineated using survey of India topomaps based on the guidelines given in the Karnataka watershed atlas published by Karnataka State Remote Sensing Application Centre. The meteorological data for 300 rain gauge stations from 1991 to 2009 in the state have been taken to study sustainable water resource. Therefore a watershed is an ideal unit for management and sustainable development of water resources