Water Supply to Nairobi
Most of Nairobi’s water comes from water dams located about 50km from the city that harness the Aberdares ranges water catchment area. The biggest of these sources is Thika dam (Ndakaini) upstream of Ngethu Water Works in Gatundu, which produces over 80% of the water from this source.
The diagram to the left illustrates these sources and their respective yields. Total water supplied to the city from these dams is about 460,000m3/day.
These water sources are not always sufficient for the city’s water requirements, so the authorities sometimes resort to water rationing for months. Experts blame this problem on periodic droughts, reservoir siltation attributed to deforestation of the catchment areas, leakages in the distribution network, and illegal connections.