1. Faculty of Engineering, Department of Civil and Environmental Engineering, Technical University of Bari, via Turismo 8, Q. re Paolo VI, 74100, Taranto, Italy
2. Centre for Water Systems, Department of Engineering, School of Engineering, Computer Science and Mathematics, University of Exeter, North Park Road, Exeter EX4 4QF, UKTel: +44 1392 263637; E-mail: d.savic@ex.ac.uk