1. Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana–Champaign, 205 N. Mathews Ave., 2524 Hydrosystems Laboratory, Urbana, IL 61801. E-mail: mcarr1@uiuc.edu
2. Assistant Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., 374 Town Engineering Building, Ames, IA 50011. E-mail: rehmann@iastate.edu