1. Faculty of Civil Engineering, Environmental & Water Resources Engineering, Technion, Haifa 32000, Israel (E-mail: cvrrobi@tx.technion.ac.il)
2. Department of Human Microbiology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 69978, Israel
3. Environment Water Resources, The Institute for Desert Research, Ben-Gurion University of the Negev, Kiryat Sde-Boker 84990, Israel