1. CSIRO Land and Water, Private Bag 5, Wembley WA 6913, Australia and Dept. of Biological Systems Engineering, Washington State Univ., Pullman, WA 99164-6120 (corresponding author). E-mail: Guobin.Fu@csiro.au
2. State of Washington Water Research Center and Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-3002.
3. Dept. of Biological Systems Engineering, Washington State Univ., Pullman, WA 99164-6120.