Blocked drains worsened Abuja floods, says Environment Ministry

Flash floods in Abuja worsened due to blocked manholes and underground drainage channels, according to Nigeria's Federal Ministry of Environment. A technical report detailed how silt, solid waste, and debris restricted stormwater flow, causing drainage systems to surcharge during heavy rainfall and leading to surface inundation.

The ministry's Department of Erosion, Flood and Coastal Zone Management conducted an on-the-spot assessment following a directive from the Minister of Environment. Their findings indicated that intense rainfall triggered rapid urban runoff, but the restricted drainage inlets and underground conveyance significantly increased the volume of water accumulating on the surface.

Concerns were also raised about sewage-contaminated water found in several city center locations. The report suggested this contamination could stem from cross-connections, drainage surcharge, or poor maintenance of the drainage and wastewater networks. An integrity assessment of the affected networks was called for to identify contamination sources and check for damaged or illicit connections.

The ministry stressed that the Blantyre Crescent incident highlighted a broader maintenance problem within the Federal Capital City's drainage infrastructure. They recommended immediate clearing and desilting of affected channels, along with inspections for hidden blockages. A comprehensive condition assessment of underground stormwater infrastructure across the city center was also advised, particularly in flood-prone areas.

To improve management, the ministry proposed creating a digital register of drainage assets and maintenance records. They also urged joint periodic monitoring by relevant authorities and emphasized a shift from emergency clearing to preventive, scheduled maintenance to effectively address Abuja's recurrent flooding issues.