1. Department of Geography and Environmental Engineering; Johns Hopkins University; Baltimore Maryland USA
2. Department of Geosciences; Georgia State University; Atlanta Georgia USA
3. Biosphere2, University of Arizona; Tucson Arizona USA
4. Department of Earth and Environment Sciences; Universit de Montpellier II; Montpellier France
5. Dipartimento di Ingegneria Idraulica; Marittima e Geotecnica, Universit di Padova; Padua Italy
6. Department of Soil, Water and Environmental Science; University of Arizona; Tucson Arizona USA
7. Department of Hydrology and Water Resources; University of Arizona; Tucson Arizona USA