1. Department of Civil EngineeringMekelle University P.O. Box 3185 Mekelle Ethiopia
2. Soil Physics and Land Management GroupWageningen University P.O. Box 47 6700 AA Wageningen The Netherlands
3. Department of Dryland Crop and Horticulture ScienceMekelle University P.O. Box 231 Mekelle Ethiopia
4. Soil, Water and Land Use TeamAlterra P.O. Box 47 6700 AA Wageningen The Netherlands
5. Department of Earth SciencesMekelle University P.O. Box 231 Mekelle Ethiopia