1. Faculty of Civil and Water Resources EngineeringBahir Dar Institute of Technology, Bahir Dar University Ethiopia
2. International Water Management Institute P.O. 11081 Yangon Myanmar
3. International Water Management Institute, HQ P. O. Box 2075 Colombo Sri Lanka
4. Department of Soil and Environment SwedishUniversity of Agricultural Science Uppsala Sweden
5. Department of Biological and Environmental EngineeringCornell University Ithaca New York USA