1. Department of Civil and Environmental Engineering; Colorado State University; 1372 Campus Delivery Fort Collins CO 80523-1372 USA
2. Department of Biological and Agricultural Engineering; Kansas State University; 129 Seaton Hall, 920 N. 17th St. Manhattan KS 66506-2906 USA
3. School of Earth Sciences; The Ohio State University; 275 Mendenhall Laboratory, 125 South Oval Mall Columbus OH 43210-1308 USA