1. Department of Geography, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada. Tel: 403-220-5593. E-mail: bbhandar@ucalgary.ca
2. Corresponding author. Department of Geography, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada, Tel: 403-220-2241, Fax: 403-282-6561, Tel: 403-220-5593, E-mail: grant@ucalgary.ca
3. Department of Engineering, University of Regina,; 22-54 Munroe Place, Regina, SK, S4S 4P7, Canada, Tel: 306-585-4958, E-mail: dpokhrel@yahoo.com