Hai V Pham, Desert Research Institute Las Vegas, Division of Hydrologic Sciences, Las Vegas, NV, United States, Phong V. V. Le, University of Illinois at Urbana Champaign, Urbana, IL, United States, Luyen K. Bui, Hanoi University of Geology and Mining, Hanoi, Vietnam, John M Klenke, Nye County, Pahrump, NV, United States and Karl Pohlmann, Desert Research Institute, Las Vegas, NV, United States