1. Department of Civil and Environmental Engineering University of Illinois Urbana 61801 IL USA
2. Civil Engineering Research Institute for Cold Region Hokkaido Japan
3. Illinois State Geological Survey, Prairie Research Institute University of Illinois Champaign 61820 IL USA
4. Department of Watershed Sciences Utah State University Logan 84322 UT USA
5. Department of Geology University of Illinois Urbana 61801 IL USA
6. Department of Atmospheric Sciences University of Illinois Urbana 61801 IL USA