Flooding remains the most persistent weather-related disaster facing Ghana, particularly within the Greater Accra Metropolitan Area. From the early 1960s to the present day, successive governments have struggled to find a lasting solution to the annual destruction of lives, property, and livelihoods caused by floods. Every rainy season, the same cycle repeats itself: communities are inundated, roads become impassable, homes are destroyed, businesses suffer losses, and public officials promise action.
One of the most common responses by authorities has been the demolition of buildings identified as being on waterways or flood-prone areas. While such actions may appear decisive, they do not address the root causes of flooding in Accra. The reality is that flooding in Accra is fundamentally a problem of inadequate carrying capacity within the city’s drainage system. Unless this underlying challenge is addressed, the destruction of buildings alone will continue to produce only temporary relief while the flooding problem persists.
Understanding the Real Problem: Carrying Capacity
The central issue behind Accra’s flooding is the inability of existing drainage infrastructure to accommodate and safely convey stormwater to the sea.
When rainfall exceeds the carrying capacity of drains, channels, culverts, and lagoons, water naturally accumulates in communities, resulting in flooding. The challenge is therefore not merely the presence of buildings on waterways but the broader failure of urban planning, drainage engineering, waste management, and stormwater control systems.
The flooding problem in Accra can be attributed to three major factors.
- Engineering and Infrastructure Deficiencies
The first and perhaps most important factor is poor drainage engineering and inadequate urban planning.
Large sections of Accra were developed without a comprehensive drainage network capable of handling increasing volumes of runoff resulting from urbanization. In many communities, drains either do not exist or are disconnected from larger drainage systems. Small gutters often terminate abruptly without linking to medium-sized drains, which in turn fail to connect to larger channels capable of discharging water into the sea.
A properly designed drainage system should operate as an integrated network, where water flows efficiently from local drains into secondary channels, then into major collectors, and finally into rivers, lagoons, or the ocean. Unfortunately, this chain is incomplete in many parts of Accra.
The situation surrounding the Weija Dam illustrates this challenge. Every year, excess water released from the dam floods nearby communities, causing extensive damage and requiring costly emergency rescue operations and humanitarian assistance.
Yet the Atlantic Ocean lies only a short distance away. A properly engineered high-capacity drainage canal capable of conveying excess water directly from the Densu floodplain to the sea could significantly reduce the annual flood risk. Instead of investing in permanent engineering solutions, public resources are repeatedly spent responding to disasters after they occur.
Flooding is therefore not simply a land-use problem. It is fundamentally an infrastructure problem.
- Indiscipline and Poor Waste Management
The second major factor is environmental indiscipline and ineffective waste management.
A significant proportion of solid waste generated in Accra eventually finds its way into drains, gutters, rivers, and lagoons. Plastic waste, household refuse, and sediment accumulate within drainage channels, drastically reducing their capacity to carry water.
The problem is further compounded by sandy soils that are washed into drains during rainfall events. Over time, these sediments reduce channel depth and width, causing even moderate rainfall to overwhelm drainage systems.
Many older residents recall a period when Town Council Officials, popularly known as “Tangas,” regularly inspected communities to enforce sanitation standards. Environmental health officers monitored household sanitation practices, inspected drains, and ensured that residents maintained clean surroundings.
Communities that failed to comply faced penalties and prosecution. While such measures may have been unpopular, they helped maintain environmental discipline and reduced the blockage of drainage systems.
Today, weak enforcement of sanitation regulations has contributed significantly to Accra’s flood vulnerability. No drainage system, regardless of size, can function effectively if it is continuously clogged by waste.
- Lack of Stormwater Infiltration Systems
The third factor is the absence of adequate stormwater infiltration infrastructure.
Modern cities incorporate infiltration systems, soakaway pits, retention basins, and stormwater management facilities designed to absorb rainwater and allow it to percolate into the ground.
In much of Accra, however, residential compounds are heavily paved with concrete, reducing the amount of water that can naturally infiltrate the soil. Many roads lack proper drainage channels, and numerous communities do not possess adequate soakaway systems to manage stormwater.
Consequently, almost all rainfall becomes surface runoff that must be transported through an already overstretched drainage network.
The result is predictable: once rainfall exceeds the carrying capacity of drains, flooding occurs.
Why Demolishing Buildings Alone Will Not Solve the Problem
While unauthorized construction on waterways can worsen flooding in specific locations, focusing exclusively on demolitions treats the symptoms rather than the disease.
If drainage systems remain undersized, blocked, poorly maintained, or disconnected, flooding will continue even after structures are removed.
Similarly, if solid waste continues to enter drains and major waterways remain silted, water will still overflow during heavy rainfall.
A sustainable solution requires addressing the entire flood management system rather than concentrating solely on buildings occupying waterways.
A Comprehensive Solution for Accra
- Redesign and Expand Accra’s Drainage Network
Government should undertake a comprehensive redesign of Accra’s stormwater infrastructure with emphasis on increasing carrying capacity.
Special attention should be given to flood-prone communities such as Alajo, Odawna, Kwame Nkrumah Circle, Kaneshie, Abossey Okai, Nima, Adabraka, Agbogbloshie, Old Fadama, Korle Gonno, Jamestown, Sakaman, Mataheko, Mallam Junction, Glefe, Bortianor, Weija, Dansoman, Awoshie, Santa Maria, Ashaiman, Madina, Adenta, Dome, Taifa, Pokuase, Ashaley Botwe, East Legon, and other identified flood-risk zones.
The drainage system should incorporate engineered soakaway pits, retention ponds, infiltration systems, and larger drainage channels capable of managing future rainfall volumes.
- Desilt and Restore Major Flood Basins
Flood management efforts should prioritize the rehabilitation and maintenance of Accra’s four principal drainage basins:
- Odaw River Basin
- Korle Lagoon Basin
- Densu River Basin
- Kpeshie Lagoon Basin
Regular desilting and clearing operations should be conducted to restore the original carrying capacity of these critical waterways.
- Establish a Modern Sanitation Agency
A dedicated and adequately resourced sanitation authority should be established to oversee waste collection throughout the metropolis.
Waste collection should occur at least once daily in densely populated areas and multiple times weekly elsewhere. Adequate vehicles, personnel, transfer stations, and disposal facilities must be provided to prevent waste from entering drains.
- Strict Enforcement of Sanitation Laws
Existing sanitation regulations must be enforced consistently and impartially.
Environmental health officers should be empowered to conduct regular inspections, issue penalties where necessary, and promote community responsibility for maintaining clean surroundings.
Public education campaigns should complement enforcement efforts to encourage behavioural change and foster a culture of environmental stewardship.
Conclusion
More than six decades of recurring floods demonstrate that Accra’s flooding crisis cannot be solved through the destruction of buildings alone. While preventing construction on waterways remains important, it addresses only one aspect of a much larger challenge.
The real solution lies in increasing the city’s drainage carrying capacity through improved engineering, modern stormwater management systems, effective waste collection, regular desilting of waterways, and strict enforcement of sanitation laws.
Until these structural issues are addressed, Accra will continue to experience annual flooding regardless of how many buildings are demolished. Sustainable flood management requires long-term investment, political commitment, and a comprehensive strategy that tackles the root causes of the problem rather than merely responding to its visible symptoms.
This version is suitable for publication as a newspaper opinion piece, policy paper, or professional article on urban planning and flood management in Ghana.
highlightseveryone
highlights
Bright Kwashie Dzokoto
