1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Private Bag 92019, Auckland 1142, New Zealand (corresponding author). ORCID: .
2. Professor, School of Built Environment, Massey Univ., Albany Campus, Private Bag 102904, Auckland 0745, New Zealand.
3. Senior Lecturer, Dept. of Geospatial Science and Technology, Ardhi Univ., P.O. Box 35176, Makongo, Dar es Salaam 14129, Tanzania.
4. Director, Div. of Water Production and Distribution, Dar es Salaam Water Supply and Sewerage Authority, P.O. Box 1573, Mwananyamala, Dar es Salaam 14108, Tanzania.
5. Director, Water Resources Division, Ministry of Water, P.O. Box 456, Mtumba, Dodoma 41207, Tanzania.
6. Planning and Construction Engineer, Dept. of Planning and Construction, Morogoro Urban Water Supply and Sewerage Authority, P.O. Box 5476, Sabasaba, Morogoro 67103, Tanzania.