1. Graduate Research Assistant, Water Management and Hydrological Science Program, Texas A&M Univ., College Station, TX 77843 (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., 321 Scoates Hall, 2117 TAMU, College Station, TX 77843.