Nairobi continues to face severe flooding every rainy season, affecting motorists, businesses, and residents despite billions invested in roads and drainage systems. A recent report by the World Resources Institute (WRI) reveals that the crisis stems from a combination of factors beyond just heavy rainfall.

Key findings from the WRI report include:

  • Urban planning failures: Rapid, unregulated development on floodplains and riparian zones has eroded natural flood buffers like wetlands and forests.
  • Outdated drainage infrastructure: Many drainage systems date back to the colonial era and have not been adequately upgraded to match Nairobi’s population growth and urban expansion.
  • Poor waste management: Illegal dumping clogs drainage channels, reducing their capacity during heavy rains.
  • Fragmented institutional response: Multiple agencies with overlapping mandates lack coordination, weakening flood prevention efforts.

The report highlights that Nairobi’s geography, with rainwater flowing from high western areas to lower eastern neighborhoods, exposes many communities to flooding. Informal settlements such as Mathare, Mukuru, and Kibera are heavily affected, but flooding now also impacts central business districts and other residential areas.

Recent floods have had devastating impacts: the 2024 long rains caused 11 deaths, displaced over 20,000 families, and damaged extensive road networks and bridges. The March 2026 floods resulted in 37 fatalities and widespread disruption.

WRI warns that climate change is intensifying rainfall patterns, making extreme flooding events more frequent and severe. Rainfall once expected every 50 years may now occur multiple times per decade, escalating risks if urban planning and infrastructure remain unchanged.

Beyond immediate damage, flooding has triggered disease outbreaks, disrupted education, destroyed businesses, and overwhelmed healthcare facilities. Approximately 147,000 people suffered waterborne illnesses following the 2024 floods.

Recommendations to curb Nairobi’s flood crisis include:

  • Stronger enforcement of land-use and environmental regulations
  • Protection and restoration of wetlands, riverbanks, and urban forests
  • Expansion of green infrastructure alongside conventional drainage improvements
  • Enhanced early warning systems and community-led preparedness initiatives
  • Improved inter-agency coordination and increased investment in resilient infrastructure

The report concludes that Nairobi’s flooding challenges are rooted in decades of planning failures compounded by climate change. Without urgent and coordinated action, the city faces escalating flood risks, economic losses, and human suffering in future rainy seasons.