1. a Department of Civil Engineering, W355 Nebraska Hall , University of Nebraska , Lincoln, NE, 68588-0531, USA E-mail:
2. b South Florida Water Management District, 3301 Gun Club Road , West Palm Beach, FL, 33401, USA E-mail:
3. c Department of Civil and Environmental Engineering, 205 North Mathews , University of Illinois , Urbana, IL, 68501, USA E-mail:
4. d Department of Civil Engineering , Universidad de Chile , Av. Blanco Encalada, 2002, Santiago, Chile E-mail: