Affiliation: | 1. Department of Geology, University of Kerala, Thiruvananthapuram, 695 581, Kerala, India;2. Department of Geological & Mining Engineering & Sciences, Michigan Technological University, 1400 Townsend Drive, Houghton, MI, 49931, USA;3. Geological Survey of India, Thiruvananthapuram, 695 013, Kerala, India;4. Central Ground Water Board, Thiruvananthapuram, 695 004, Kerala, India |