1. Graduate Research Assistant, Ven Te Chow Hydrosystems Laboratory, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205N. Mathews Ave., Urbana, IL 61801.
2. Lecturer, Faculty of Management, Dept. of Natural Resources and Environmental Management, Univ. of Haifa, Haifa 31905, Israel.
3. Professor, Ven Te Chow Hydrosystems Laboratory, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205N. Mathews Ave., Urbana, IL 61801 (corresponding author).