1. Department of Civil and Environmental EngineeringWashington State UniversityPullman WA USA
2. Department of MathematicsWashington State UniversityPullman WA USA
3. Hydrogeology Group, Department of Geotechnical Engineering and GeosciencesUniversitat Politecnica de CatalunyaBarcelona Spain
4. Department of Civil and Environmental EngineeringUniversity of California at DavisDavis CA USA
5. Environmental Studies and Research InstituteUniversity of Sadat CitySadat Minufiya Egypt
6. Mathematik Universität Erlangen‐NürnbergErlangen Germany