Heavy rain exposes how poor drainage runs deep in Nairobi Monday May 10 2021 Heavy overnight downpour that pounded Nairobi yesterday has exposed the underbelly of the city that is poor drainage system. NMG PHOTO By COLLINS OMULO Summary Heavy overnight downpour that pounded Nairobi Monday has exposed the underbelly of the city that is poor drainage system. Pools of water, flooded roads and over-flowing storm water drainages characterised most parts of the capital as residents woke up to a heavy rain causing pools of water. Heavy overnight downpour that pounded Nairobi Monday has exposed the underbelly of the city that is poor drainage system.