1. Department of Geography; Durham University; Durham DH1 3LE UK
2. Department of Civil Engineering; University of Bristol; Bristol BS8 1TR UK
3. Global Institute for Water Security, School of Environment and Sustainability; University of Saskatchewan; Saskatoon SK S7N 5C8 Canada
4. School of Geosciences; University of Aberdeen; Aberdeen AB34 3FX UK
5. Geography, College of Earth, Ocean, and Atmospheric Sciences; Corvallis OR 97331 USA
6. School of Environmental and Life Sciences; Newcastle University; Newcastle NSW 2308 Australia