1. Department of Civil and Environmental Engineering; University of Iowa; Iowa City Iowa USA
2. School of Civil Engineering and Department of Agronomy; Purdue University; West Lafayette Indiana USA
3. Nicholas School of the Environment; Duke University; Durham North Carolina USA
4. Department of Geography; University of British Columbia; Vancouver, British Columbia Canada
5. Department of Geography; University of Illinois at Urbana-Champaign; Urbana Illinois USA
6. Department of Civil and Environmental Engineering; University of Illinois at Urbana-Champaign; Urbana Illinois USA