1. a Department of Geography , University of Guelph , 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
2. b Research Branch, Agriculture and Agri-Food Canada , Research Branch , 960 Carling Avenue, Ottawa, ON, K1A-0C6, Canada
3. c Department of Hydrology and GeoEnvironmental Sciences , Vrije Universiteit Amsterdam , De Boelelaan 1085-1081 HV, Amsterdam, the Netherlands