water Article Separating Wet and Dry Years to Improve Calibration of SWAT in Barrett Watershed, Southern California Xin Gao 1 ID , Xingwei Chen 1,2,3,*, Trent W. Biggs 4 and Huaxia Yao 5 1 College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China; gaoxin_water@...