1. Department of Engineering Geology and Hydrogeology, Faculty of Geology University of Sciences, Vietnam National University Ho Chi Minh City 227 Nguyen Van Cu Street, Ward 4, District 5 Ho Chi Minh City 700000 Vietnam
2. Department of Geotechnology, Faculty of Technology Khon Kaen University 123 Mittrapap Road, Nai‐Muang, Muang District Khon Kaen 40002 Thailand
3. Division of Water Resources Planning Investigation for the South of Vietnam 59 Street 2, Binh An Ward, District 2 Ho Chi Minh City 700000 Vietnam
4. Department of Geology University of Kansas 1414 Naismith Dr. Lawrence KS 66045 USA