1. PhD Candidate: DIIAR, Dept. of Hydr. Envir. Engrg. and Survey—Envir. Sect., Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milan, Italy. E-mail: ficara@ambl.amb.polimi.it
2. Assoc. Prof.: DIIAR, Dept. of Hydr. Envir. Engrg. and Survey—Envir. Sect., Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milan, Italy. E-mail: rozzi@ambl.amb.polimi.it