Department of Civil and Environmental Engineering, University of Illinois at Urbana- Champaign, 205 N. Mathews, Urbana, IL 61801, United States
Division of Hydrologic Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, United States
Department of Mathematics and Statistics, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand
Department of Geography and Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 220 S. Mathews, Urbana, IL 61801, United States