1. Arizona State Univ., Tempe, Arizona 85287-5306, USA (E-mail: mays@asu.edu)
2. Department of Water Resources, School of Civil Engineering, National Technical University of Athens, Heroon Polytechneiou 5, GR 157 80, Zographou, Greece (E-mail: dk@itia.ntua.gr)
3. Institute of Iraklio, National Agricultural Research Foundation, 71307 Iraklio, Greece (E-mail: angelak@nagref-her.gr)