1. a Department of Civil and Environmental Engineering, Makerere University, P.O. Box 7062, Kampala, Uganda
2. b MEIR Engineering and Research Ltd, P.O. Box 114780, Kampala, Uganda
3. c Department of Water Resources Engineering, Lund University, P.O. Box 118, Lund, Sweden
4. d Centre for Water Systems, Department of Engineering, University of Exeter, North Park Road, Exeter EX4 4QF, United Kingdom