1. Biological and Agricultural Engineering, Texas A&M Univ., 2117 TAMU, College Station, TX 77843-2117 (corresponding author).
2. Caroline and William N. Lehrer Distinguished Chair in Water Engineering and Professor, Dept. of Biological and Agricultural Engineering and Dept. of Civil and Environmental Engineering, Texas A&M Univ., 2117 TAMU, College Station, TX 77843-2117.
3. Director, Center for Water Research, Univ. of Western Australia, M023, 35 Stirling Hwy, Crawley 6009, Australia.