1. Engineer in Training, Catterall and Wright, Consulting Engineers, 1221 8th St. E, Saskatoon SK, Canada S7H 0S5; formerly MSc. Graduate Student, Dept. of Civil and Geological Engineering, Univ. of Saskatchewan. E-mail: s.mcleod@cwce.ca
2. Associate Professor, Dept. of Civil and Geological Engineering, Univ. of Saskatchewan, 57 Campus Dr., Saskatoon SK, Canada S7N 5A9 (corresponding author). E-mail: Jim.Kells@usask.ca
3. Associate Professor, Dept. of Civil and Geological Engineering, Univ. of Saskatchewan, 57 Campus Dr., Saskatoon SK, Canada S7N 5A9. E-mail: Gordon.Putz@usask.ca