1. Assistant Professor, Dept. of Geology, Faculty of Earth and Environmental Sciences, Univ. of Dhaka, Curzon Hall Campus, Dhaka 1000, Bangladesh.
2. Professor, Dept. of Geology, Faculty of Earth and Environmental Sciences, Univ. of Dhaka, Curzon Hall Campus, Dhaka 1000, Bangladesh.
3. Graduate Research Assistant, Dept. of Geology, Faculty of Earth and Environmental Sciences, Univ. of Dhaka, Curzon Hall Campus, Dhaka 1000, Bangladesh.
4. Hydrologist, Acacia Water, Jan van Beaumontstraat 1, 2805 RN Gouda, Netherlands.
5. Superintendent Engineer, Dept. of Public Health Engineering, DPHE Bhavan, 14, Shaheed Captain Mansur Ali Sarani, Kakrail, Dhaka 1000, Bangladesh.
6. Executive Engineer, Dept. of Public Health Engineering, DPHE Bhavan, 14, Shaheed Captain Mansur Ali Sarani, Kakrail, Dhaka 1000, Bangladesh.
7. WASH Specialist, Water and Environmental Sanitation Section, UNICEF Bangladesh, BSL Office Complex, 1 Minto Rd., Dhaka 1000, Bangladesh; presently, Consultant, Water and Sanitation Program (WSP), c/o World Bank, Plot E 32, Sher-e-Bangla Nagar, Agargaon, Dhaka 1207, Bangladesh.
8. Professor, School of Earth and Environmental Sciences, Queens College, City Univ. of New York, 65-30 Kissena Blvd., Flushing, NY 11367; and Adjunct Senior Research Scientist, Lamont-Doherty Earth Observatory of Columbia Univ., Palisades, NY 10964; formerly, WASH Specialist, Water and Environmental Sanitation Section, UNICEF Bangladesh, BSL Office Complex, 1 Minto Rd., Dhaka 1000, Bangladesh (corresponding author).