1. Postdoctoral Research Staff Member, Atmospheric, Earth, and Energy Div., Lawrence Livermore National Laboratory, P.O. Box 808, L-103, Livermore, CA 94551; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, Stanley Hydraulics Laboratory, The Univ. of Iowa, Iowa City, IA 52242.
2. Associate Professor, Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, Stanley Hydraulics Laboratory, The Univ. of Iowa, Iowa City, IA 52242 (corresponding author).
3. Professor, College of Engineering and Applied Science, The Univ. of Wyoming, Laramie, WY 82071.