1. Assistant Professor and Senior Engineer, Irrigation Training and Research Center, BioResource and Agricultural Engineering Dept., California Polytechnic State Univ., San Luis Obispo, CA 93407; formerly, Graduate Student Researcher, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697 (corresponding author).
2. Professor and Chair, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697.