The Ogun State Government has issued a new flood advisory ahead of the second phase of the 2026 rainy season, warning residents in vulnerable communities to remain alert and relocate where necessary.
The advisory followed seasonal forecasts indicating that the state could experience intense rainfall from September.
Environment Commissioner Ola Oresanya said the first phase of the rainy season, from mid-March through July, produced heavy rainfall and isolated flash flooding but caused comparatively limited damage.
He attributed the lower impact to public awareness, regular clearing of waterways and drainage channels and improvements in waste management.
The government said maintenance work had been carried out on major river systems and canals including Sokori River, Opa-Aro, Adiyan, Eruwuru, Yemule, Gbogidi Canal and Ijamido.
According to the state, September rainfall could average about 360mm.
The risk is expected to increase where prolonged rainfall combines with controlled overflow from Oyan Dam and tidal conditions that slow the discharge of the Ogun River.
Oresanya said those conditions could oversaturate wetlands and floodplains.
Residents in Isheri, Arepo, Mawere, Magboro, Akute, Warewa and parts of Abeokuta were advised to remain particularly vigilant.
The warning also covers coastal and riverine communities in Ogun Waterside, Ijebu East and Ipokia local government areas, as well as settlements along the Ilo and Iju river floodplains.
Fish farmers operating in flood-prone areas were advised to harvest stocks early to limit losses.
The government also asked local authorities, emergency agencies and community leaders to intensify monitoring and keep drainage channels free from obstructions.
Ogun said it would continue tracking hydrological and weather conditions in collaboration with NiMet, the Nigeria Hydrological Services Agency and the Ogun-Osun River Basin Development Authority.
Residents were urged to take further official warnings seriously as the peak rainfall period progresses.
