Rapid urbanization exposing fragile infrastructure in Global South cities

Cities across the Global South are expanding faster than their infrastructure systems can keep up, exposing millions of urban residents to weak transport, unsafe water, poor sanitation, housing crisis and rising climate risks, according to a new review published in the MDPI journal Land. The study finds that the problem is not only rapid urban growth, but also the failure of institutions, financing systems and planning tools to manage that growth.

Titled "Towards Sustainable Urban Development: A Systematic Review of Challenges in Urban Infrastructure Planning and Development in the Global South" the review paper identifies seven major barriers to sustainable urban infrastructure planning: weak governance and institutions, economic constraints, climate and environmental pressures, rapid urbanization, technological gaps, political instability and social exclusion.

The review asserts that sustainable urban development will require more than new roads, water networks or housing schemes; it will depend on stronger governance, inclusive planning, nature-based solutions, better data systems and long-term investment models.

Urban growth is overwhelming weak infrastructure systems

Urban infrastructure shapes access to water, sanitation, transport, housing, energy, health services, education and waste management. When these systems fail, urban growth becomes a source of vulnerability rather than opportunity.

The study shows that many cities in the Global South are struggling because population growth, migration and informal expansion are outpacing formal planning and investment. Urban areas often spread into peri-urban zones without clear land-use controls, adequate public services or coordinated infrastructure networks. These areas frequently sit between overlapping jurisdictions, making accountability and service delivery more difficult.

The consequences are clearly visible in the growth of informal settlements, urban sprawl and uneven access to basic services. Many residents live without secure tenure, piped water, sewage systems or reliable electricity. Poorer communities are often pushed to unstable or low-lying areas where they face higher risks from flooding, pollution and inadequate drainage.

The review links these outcomes to a persistent gap between planning documents and real-world capacity. Infrastructure plans in many developing urban areas are often detached from social, financial, institutional and environmental conditions. As a result, cities may adopt ambitious strategies that cannot be implemented because local authorities lack the funds, skilled staff, data systems or political stability needed to deliver them.

The problem is also ecological. Rapid urban expansion can erode green space, weaken natural drainage systems, increase flood exposure and reduce climate resilience. The study stresses that infrastructure planning cannot be treated as an engineering issue alone. It must account for land, water, ecosystems, settlement patterns and social equity.

Governance, finance and climate pressures drive the infrastructure gap

Governance and institutional weakness were identified as one of the most serious barriers. Corruption, mismanagement, poor coordination, weak accountability and unclear institutional mandates frequently delay or distort infrastructure delivery. In some cases, overlapping responsibilities between national, regional and local authorities leave projects stalled or poorly maintained.

A shortage of professional capacity further weakens implementation. Many urban authorities lack enough trained planners, engineers, contractors and technical staff to design, execute and maintain infrastructure projects. This capacity gap affects not only construction but also long-term management, monitoring and maintenance.

Economic constraints deepen the crisis. Local governments often face large gaps between available budgets and the scale of infrastructure investment required. Limited municipal revenue, weak cost recovery, dependence on external funding and high project costs all restrict the ability of cities to expand and upgrade services. In poorer communities, low household incomes also limit the affordability of connection fees, tariffs and service charges.

Climate change is another major pressure. The study highlights floods, droughts, heatwaves, extreme rainfall and sea-level rise as growing threats to roads, bridges, drainage systems, water supply networks and buildings. These risks are especially severe where urban growth has taken place in floodplains, wetlands or poorly serviced settlements.

Technological and data gaps also undermine planning. Many cities lack accurate infrastructure inventories, demand forecasts, geographic data and modern planning tools. Without reliable data, authorities struggle to anticipate where growth will occur, how services should be phased or which communities face the greatest risks.

Political instability and conflict add further strain in fragile settings. The review notes that violence, weak policy continuity and short political cycles can damage infrastructure, weaken state providers and push leaders toward short-term projects rather than long-term urban resilience. Inconsistent policies and political interference can also discourage private-sector participation in infrastructure investment.

Social inequality cuts across all these challenges. Infrastructure deficits are not evenly distributed. Marginalized residents often face the weakest access to transport, housing, sanitation, water and connectivity. When these communities are excluded from planning decisions, their needs remain invisible, reinforcing cycles of poverty, poor health, limited mobility and weak economic opportunity.

Why it matters for sustainable urban policy

Cities in the Global South cannot build their way out of the infrastructure crisis without reforming how infrastructure is planned, financed and governed. New projects will remain inadequate if they are not backed by capable institutions, stable funding, inclusive decision-making and climate-aware design.

The authors point to three broad priorities:

Governance and institutional reform

Cities need clearer mandates, stronger coordination between agencies, transparent procurement, public disclosure, anti-corruption safeguards and stronger professional capacity. Infrastructure planning also needs to be linked more closely with land-use policy, housing strategy and environmental protection.

Integration of technological and nature-based solutions

Digital planning tools, data systems and modern monitoring technologies can help cities map demand, track infrastructure performance and improve decision-making. At the same time, green infrastructure, ecological networks, flood-sensitive design and climate-resilient systems can reduce environmental risk while improving urban liveability.

Collaboration and capacity building

Public–private partnerships, community engagement, participatory planning and local workforce training can help align infrastructure investment with real urban needs. Community involvement is especially important in informal and peri-urban settlements, where official data and formal planning systems often fail to capture everyday service gaps.

The review also highlights the need for more sustainable financing. Land value capture, property taxation, betterment levies, development charges, ground rent and other municipal finance tools may help cities reduce dependence on uncertain external funding. But such instruments require administrative capacity, transparency and safeguards to prevent exclusion or unfair cost burdens on low-income residents.

Sustainable urban development in the Global South depends on a shift from reactive planning to proactive, adaptive and inclusive infrastructure governance. Cities facing rapid growth need systems that anticipate demand, protect vulnerable communities and withstand climate shocks.