1. School of Civil Engineering, University of Leeds, Leeds LS2 9JT, U.K.
2. Bureau for Policy and Programme Support, United Nations Development Program, One United Nations Plaza, New York, New York 10017, United States
3. Narok Water and Sewerage Services Co., Ltd., P.O. Box 935-20500, Narok 935-2050, Kenya
4. Citywise Advisory Services, c/o Sanergy collaborative, Sameer Africa, Enterprise Road Nairobi, Nairobi 30429, Kenya