The African Meridian Newsroom · Nairobi, Kenya · 1 July 2026
East Africa’s fast-growing cities are increasingly whipsawing between two extremes: torrential, deadly rains that overwhelm drainage systems built for a smaller, drier past, followed by dry spells that strain water supplies just as abruptly. The United Nations Environment Programme says the pattern is no longer an anomaly but the new normal for urban East Africa — and it is urging city planners to stop fighting it with concrete alone.
Rapid, often unplanned urban growth across cities in Kenya, Uganda, Tanzania and Ethiopia has paved over wetlands, floodplains and natural drainage channels that once absorbed heavy rainfall and recharged groundwater during dry periods. With that natural buffering capacity reduced, a single intense storm can now flood entire neighbourhoods within hours, while the underlying water tables remain vulnerable to the droughts that follow.
UNEP’s guidance to regional governments centres on a concept increasingly favoured by urban planners globally: designing with water rather than against it. That means restoring urban wetlands and river buffers, protecting remaining floodplains from construction, and building drainage infrastructure that mimics natural water flow instead of simply channelling stormwater away as fast as possible. Advocates of the approach argue it is both cheaper and more resilient over time than continually raising drainage capacity to match ever more extreme rainfall events, particularly for cities where informal settlements have already expanded onto flood-prone land.
The stakes are highest for the low-income communities that make up a large share of East Africa’s rapidly expanding urban population, and who are disproportionately concentrated in the flood-prone, poorly drained areas of cities like Nairobi, Dar es Salaam and Kampala. As the region’s cities continue to grow, UNEP’s message is that how — and where — that growth happens will increasingly determine whether the next heavy rain becomes an inconvenience or a disaster.