1. Dep. of Civil and Environmental Engineering Univ. of Illinois at Urbana‐Champaign 3217 Newmark Civil Engineering Laboratory, 205 North Mathews Ave. Urbana IL 61801 USA
2. Dep. of Agricultural and Biological Engineering Univ. of Illinois at Urbana‐Champaign 1304 W. Pennsylvania Ave., 360 G Agricultural Engineering Sciences Building Urbana IL 61801 USA