1. 1 Department of Biosystems and Agricultural Engineering, University of Kentucky, 128 C.E. Barnhart Building, Lexington, KY 40546-0276, USA
2. 2 US Geological Survey, Ohio-Kentucky-Indiana Water Science Center, 9818 Bluegrass Parkway, Louisville, KY 40299-1906, USA
3. 3 Department of Forestry and Natural Resources, T.P. Cooper Building, University of Kentucky, 730 Rose Street, Lexington, KY 40546-0073, USA