1. Research Associate, Blackland Research & Extension Center, Texas A&M AgriLife Research, 720 East Blackland Rd., Temple, TX 76502; and Grassland, Soil & Water Research Laboratory, USDA-ARS, 808 East Blackland Rd., Temple, TX 76502 (corresponding author).
2. Assistant Professor, Blackland Research & Extension Center, Texas A&M AgriLife Research, 720 East Blackland Rd., Temple, TX 76502.
3. Research Associate, Dept. of Hydraulic and Ocean Engineering, National Cheng Kung Univ., Tainan City 701, Taiwan.
4. Agricultural Researcher, National Academy of Agricultural Science, Rural Development Administration, Seodun-dong, Kweonseon-gu, Suwon 441-707, South Korea.
5. Ph.D. Student, Dept. of Geosciences, Colorado State Univ., Fort Collins, CO 8052; formerly, Master’s Student, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523.
6. Assistant Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523.