1. Department of Civil and Environmental Engineering, Arizona State University, Box 5306, Tempe, AZ 85287-5306, USA Tel: 480-965-2885 Fax: 480-965-0557 E-mail: p.westerhoff@asu.edu
2. National Center for Sustainable Water Supply, Department of Civil and Environmental Engineering, Arizona State University, Box 5306, Tempe, AZ 85287-5306, USA Tel: 480-965-2327 Fax: 480-965-0557 E-mail: heath.mash@asu.edu