1. PhD Student, School of Engineering, Univ. of Guelph, Guelph ON, Canada N1G 2W1; also, Facultad de Ciencias e Ingenieria, Univ. de Cartagena, Cartagena de Indias, Colombia.
2. Associate Professor, School of Engineering, Univ. of Guelph, Guelph ON, Canada N1G 2W1 (corresponding author).
3. Associate Professor, Land Resources Science, Univ. of Guelph, Guelph ON, Canada N1G 2W1.