1. Hydrology and Remote Sensing Laboratory, USDA-ARS, Beltsville, Maryland
2. National Laboratory for Agriculture and the Environment, USDA-ARS, Ames, Iowa
3. Department of Plants, Soils, and Biometeorology, Utah State University, Logan, Utah
4. Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, Colorado
5. Arid-Land Agricultural Research Center, USDA-ARS, Maricopa, Arizona
6. Conservation and Production Laboratory, USDA-ARS, Bushland, Texas