Lagos faces flash flood threat, experts urge precaution in high-risk areas

The Lagos State Government has expressed serious concerns about the growing threat of flash floods following Thursday’s intense rainfall, which officials say was the heaviest in months.

Commissioner for Environment and Water Resources, Tokunbo Wahab, highlighted the dual impact of torrential rain and water releases from Oyan Dam, which have overwhelmed the city’s drainage systems.

Wahab explained in a statement on Sunday that water levels at key locations have risen sharply in recent weeks due to persistent rains and controlled releases by the Ogun-Osun River Basin Development Authority (OORBDA).

“Our four gauge stations have recorded drastic water level increases, especially in areas near the Ogun River,” he said. Among the most affected areas are Kara, where water levels have reached 2.2 meters, and Isheri-North GRA, where they have surpassed critical flood thresholds at 20.015 meters.

Environmental experts warn that the combination of dam water releases and heavy rainfall poses a significant risk to low-lying areas. Dr. Bimbo Adeleke, a hydrologist, noted that the city’s flood infrastructure is struggling to cope with the rising water levels.

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“The Oyan Dam release has exacerbated an already precarious situation, especially in places like Isheri and Majidun where water levels have consistently risen beyond normal thresholds,” she said.

Adeleke recommends urgent relocations for residents in flood-prone zones, adding that the situation could worsen if rainfall continues at current rates.

Urban planner and disaster management expert, Prof. Tunde Ajayi, also expressed concern about Lagos’ vulnerability to flash floods during this period.

“Lagos is naturally low-lying, and when you add heavy rainfall with dam releases, the risks multiply,” Ajayi said. He urged residents to take government warnings seriously, advising them to relocate to higher ground to avoid further loss of life and property.

The Lagos State Government’s flash flood advisory specifically highlighted Kara, Isheri-North GRA, Majidun, and Falomo as high-risk areas.

The advisory pointed out that October’s rainfall levels have exceeded previous months, with more intense weather expected later this month.

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In July, a 10-hour downpour paralyzed Lagos and parts of Ogun State, resulting in widespread flooding that toppled buildings, stranded thousands, and caused school closures.

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Water levels in areas like Kara and Isheri-North GRA have since remained perilously high, prompting concerns that future rains could trigger more severe flooding.

Wahab emphasized that the threat of flooding remains high, particularly for residents living near the Ogun River and other low-lying areas.

He urged those at risk to prioritize their safety by relocating upland to minimize the impact of potential flash floods.

“The safety of our residents is our top concern, and we urge everyone in vulnerable areas to stay vigilant and take necessary precautions,” Wahab said.

Environmentalists advise the public to be proactive as Lagos anticipates more rainfall in the coming weeks. As Ajayi noted, “Relocating may be inconvenient, but it’s a small price to pay for safety in the face of unpredictable weather and water management challenges.”