1. Faculty of Natural Resources, Department of Forestry and Range Resources, Private Bag, Botswana University of Agriculture and Natural Resources, Gaborone, Botswana
2. Faculty of Engineering and Technology, Department of Civil and Environmental Engineering, Botswana International University of Science and Technology, Palapye, Botswana
3. Soil and Forests, Department of Forest Resources, University of Tlemcen, Research Laboratory N°31, Conservatory Management of Water, Tlemcen, Algeria