1. Department of Civil & Environmental Engineering, College of Engineering, Design, Art & Technology, Makerere University, P.O. Box 7062, Kampala, Uganda
2. External Services, National Water & Sewerage Corporation, P.O. Box 7053, Kampala, Uganda
3. Department of Inorganic Chemistry, Royal Institute of Technology (KTH), Teknikringen 30, SE-100 44 Stockholm, Sweden
4. Department of Land & Water Resources Engineering, Royal Institute of Technology (KTH), Teknikringen 30, SE-100 44 Stockholm, Sweden