Assessing the Vulnerability of Critical Urban Infrastructure to Flooding: A Framework for Climate Resilience

Background of the Study
Climate-induced flooding has emerged as a severe threat to modern urban centers, where high demographic concentrations and extensive impervious surfaces compound the volume and velocity of surface runoff. While this hydrometeorological shift poses operational strains on planned metropolitan grids, it creates an existential crisis for dense, informal settlements within developing nations. Across sub-Saharan Africa, rapid and unplanned urbanization has systematically driven low-income populations onto marginal, ecologically fragile, and flood-prone lands. These settlements typically develop outside municipal planning frameworks, meaning they lack engineered structural protections, centralized utility services, and flood-resilient infrastructure.
At the macro level, global climate change has compromised traditional urban water management paradigms that rely on climate stationary the assumption that historical hydrological regimes accurately predict future events. Modern infrastructure assets are increasingly exposed to extreme pluvial and fluvial conditions that exceed their original engineering design thresholds. When a single node in an urban utility matrix fails, cascading impacts can ripple across seemingly independent sectors (Hussainzad & Gou, 2024).
Regionally, sub-Saharan cities face the dual pressures of severe infrastructure capital deficits and rapid horizontal expansion. Rural-to-urban migration outpaces municipal budgeting capacity, converting natural buffers like floodplains and wetlands into high-density, unpaved urban corridors (Laji & Ayonga, 2024).
At the local level, Lusaka, Zambia, offers a clear example of how unique geological features and severe municipal deficits combine to maximize flood vulnerability. Geographically, Lusaka is situated on a flat karst plateau underlain by highly permeable limestone sitting atop an impermeable basement rock layer. During intense rainy seasons, the local aquifer quickly becomes saturated, causing the water table to rise to or above the ground surface. This natural vulnerability is severely worsened by human factors. Approximately 70% of Lusaka’s population resides in informal, peri-urban settlements ("compounds") that lack formal development oversight.
In settlements like Kanyama, Kalikiliki, and Mandevu, seasonal flooding inflicts structural damage on homes and disrupt the informal economic markets that support local livelihoods (African Journal of Commercial Studies, 2026). The infrastructure deficit is most evident in the absence of a continuous, lined drainage network. Existing drainage channels are fragmented, improperly graded, and routinely blocked by solid waste due to gaps in municipal waste management.
During severe downpours, this structural breakdown triggers immediate public health crises. Submerged pit latrines, which serve as the primary sanitation infrastructure, overflow directly into the shallow, unlined hand-dug wells that residents rely on for drinking water. This turns an engineering failure into an active public health emergency, characterized by seasonal outbreaks of waterborne diseases like cholera, typhoid, and dysentery (Mudenda, 2025; Prince, 2025).
The persistent vulnerability of the Mandevu informal settlement highlights the need to transition away from generic disaster narratives toward a precise, spatial, and structural diagnosis of infrastructure failure. This study addresses that gap by mapping micro-level vulnerabilities and establishing an empirical framework to guide climate-resilient engineering upgrades.

Framework, Infrastructure, Assessing

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