1. Laboratory of Ecohydrology (ECHO), School of Architecture, Civil and Environmental Engineering (ENAC); Ecole Polytechnique Fédérale de Lausanne (EPFL); Station 2 1015 Lausanne Switzerland
2. Dipartimento di Elettronica e Informazione; Politecnico di Milano; Via Ponzio 34/5 20133 Milano Italy
3. Department of Civil and Environmental Engineering; Princeton University; Princeton NJ 08540 USA