Floods in South Sudan: Architectural Vulnerability, Resilience, and Design Strategies Abstract South Sudan is one of the most flood-vulnerable nations worldwide, affected annually by severe and prolonged inundation that devastates homes, infrastructure, livelihoods, and essential services. Flooding is intensifying due to climate change, weak infrastructure systems, and the absence of flood-resilient architectural strategies. This research article explores the causes and severity of floods in South Sudan, their impacts on built environments and communities, and architectural strategies for resilience. The article synthesizes data from humanitarian sources, climate analyses, and resilient design frameworks to offer evidence-based recommendations for architectural interventions in flood-prone contexts.
1. Introduction South Sudan’s landscape is dominated by vast floodplains, river basins, and wetlands fed by the Nile Basin. Seasonal rainfall — typically between April and November — drives recurrent inundation through river overflow and wetland saturation. Traditionally, some flooding has been part of local ecological cycles; however, recent years have seen floods that are more frequent, deeper, and longer lasting than historical norms due to climate change effects, including prolonged rainfall and higher river discharges. UNICEF Floods do not only present natural and humanitarian crises; they pose complex challenges across architecture, infrastructure design, and urban planning. The loss of homes, schools, health facilities, and public infrastructure underscores the urgent need for flood-responsive architectural design and resilient planning frameworks. This study analyses flooding’s environmental drivers, impacts on built environments, and design strategies to improve resilience in South Sudan’s flood-affected regions.
2. Climatic and Geographic Drivers of Flooding 2.1 Climate Variability and Change South Sudan’s flood regime is strongly tied to rainfall variability and upstream hydrological dynamics. The East African climate system — influenced by the Inter-Tropical Convergence Zone — now delivers more intense and unpredictable rainfall, which increases river discharge and overwhelms natural drainage channels. This shift has contributed to more severe flood events, particularly in the Nile Basin and Sudd wetlands. UNICEF The increased frequency of extreme rainfall events is attributed in part to climate change, which amplifies moisture retention in the atmosphere and alters precipitation patterns across the region. These changes mean floods occur at times and intensities beyond local historical experience, stretching community coping mechanisms and emergency responses. WHO | Regional Office for Africa
2.2 Geographical Vulnerability South Sudan’s geographical vulnerability stems from flat topography, extensive floodplains, and major rivers such as the White Nile and its tributaries. These landscapes act as natural flood storage systems; however, when saturated for extended periods, they fail to absorb additional water, leading to inundation of settlements and farmland. The Sudd wetlands — among the largest freshwater marshes in the world — can buffer floodwaters to an extent, but extraordinary rainfall and upstream contributions can overwhelm these buffers, spreading water far beyond historical flood extents. UNICEF
3. Flood History and Recent Events 3.1 Severity and Affected Populations In the 2024–2025 flooding season, tens of thousands of people were displaced across multiple states including Jonglei, Unity, Upper Nile, and Lakes. Recent assessments estimate that hundreds of thousands of people have been affected, with up to 379,000 exposed to protection risks in 21 flood-affected counties due to overlapping vulnerabilities such as displacement, food insecurity, and limited access to services. Global Protection Cluster Historical data and UN reports suggest that floods now impact between 750,000 and over one million people annually, forcing many families to leave their homes and seek higher ground. UNICEF
3.2 Infrastructure and Sectoral Impacts Severe floods in 2024 inundated infrastructure nationwide: • • • •
Homes and livelihoods were destroyed or damaged, contributing to the internal displacement of families. Health facilities were submerged or made inaccessible, with dozens of facilities under water in multiple counties. Road networks linking major towns, including routes to Juba, were cut off, inhibiting mobility and emergency response. Schools and education infrastructure were flooded, interrupting learning for children and disrupting educational continuity. WHO | Regional Office for Africa+1
These impacts illustrate how flood events rapidly degrade essential built infrastructure, with cascading social costs for public health, education, and economic activity. UNICEF
4. Vulnerability of Built Environments
4.1 Traditional Housing and Structural Weaknesses In rural and peri-urban areas, housing is predominantly constructed from local, traditional materials such as mud, wood, thatch, and lightweight frames. While culturally significant and economically accessible, these materials are poorly suited to prolonged submersion and high moisture exposure. When floodwaters rise — sometimes exceeding two meters in some regions — these structures rapidly deteriorate, forcing inhabitants to rebuild or relocate. JRS Moreover, many informal settlements lack engineered foundations and site drainage, increasing vulnerability to water ingress and structural damage. These patterns highlight a prevalent architectural vulnerability in South Sudan’s housing stock.
4.2 Urban Flood Challenges Urban centres like Juba City face unique flood pressures due to their flat topography, unregulated expansion, and limited stormwater infrastructure. Research shows that the absence of flood zoning, insufficient drainage systems, and development on wetlands exacerbate urban flooding. Floodwaters not only damage buildings but also disrupt sanitation and mobility, further compromising public health and economic activity. makir.mak.ac.ug Urban analyses emphasize that poor planning — including the allocation of residential plots within flood-prone lowlands — contributes significantly to structural and social vulnerability during flood events. makir.mak.ac.ug
4.3 Soil and Foundation Issues Expansive clay soils, such as black cotton soils common in parts of South Sudan, present engineering difficulties. These soils swell dramatically when wet, reducing their loadbearing capacity and resulting in foundation instability, settlement, cracking, or collapse during sustained water exposure. The convergence of poor soil performance and recurrent flood inundation amplifies structural risk for buildings without engineered foundations. Although detailed geotechnical data for flood-prone areas is limited, the broad presence of clay-dominant soils is recognized among engineers and architects as an added vulnerability in flood-affected environments.
5. Architectural Resilience and Flood-Responsive Design 5.1 Resilient Architecture Principles Resilient architecture aims to withstand, adapt to, and recover from extreme environmental events. For flood-prone contexts like South Sudan, key architectural principles include:
• • • •
Elevated Structures: Raising living spaces above documented flood levels to minimize water entry and protect interiors. Flood-Tolerant Ground Floors: Designing ground levels as floodable or water-resistant spaces that allow water to pass without jeopardizing structural integrity. Robust Materials: Utilizing materials that resist moisture damage, rot, and corrosion without requiring frequent replacement. Integrated Drainage Design: Planning sites to direct water away from structures and integrate passive stormwater management.
Design research also supports modular and adaptable building systems that enable rapid assembly, disassembly, and reuse — essential in displacement and humanitarian contexts. EPFL News
5.2 Case Study: Resilient Public Infrastructure UNICEF and partner interventions in Jonglei State demonstrate how architectural adaptations can improve infrastructure resilience: • • •
Elevated borehole platforms and water points ensure that communities maintain access to safe water even during floods. Elevated classrooms built on pilings allow education to continue despite inundation. Reinforced latrines and WASH facilities help prevent collapse during high water events, reducing public health risks. UNICEF+1
These interventions are examples of how architectural design can enhance accessibility, usability, and resilience for critical infrastructure in flood-prone areas.
5.3 Community-Based Architectural Adaptations Local communities have developed traditional adaptive practices to cope with prolonged flood exposure. In some flood-prone regions like Akuak, residents build and reinforce raised land platforms using layered mud and vegetation to maintain habitable land above water levels. Although physically demanding and resource-intensive, these adaptive practices illustrate indigenous resilience and spatial strategies that can inform architectural design. AP News Such community responses are essential for designing context-responsive, culturally grounded, and sustainable.
6. Spatial Planning and Urban Resilience 6.1 Flood-Aware Urban Planning Effective urban planning for flood resilience requires:
interventions
that
are
• • • •
Zoning restrictions that limit construction in known floodplains. Green and open buffer zones to absorb stormwater and reduce peak flood flows. Stormwater management networks including drains, retention basins, and permeable surfaces. Elevation standards for infrastructure and key public services.
Planners must integrate flood impact data into land-use decisions to prevent future losses. Community engagement and participatory planning are critical to ensure that resilience strategies reflect local needs and constraints.
6.2 Policy and Regulatory Frameworks Resilient architecture must be underpinned by supportive policy, including: • • •
Revised building codes that mandate flood-resilient design criteria. Land allocation policies that discourage settlement in high-risk flood zones. Incentives for resilient construction practices at community and municipal levels.
Despite the urgency, South Sudan’s planning frameworks remain nascent, and enforcement of building standards is often limited. Strengthening institutional capacity — including training for architects, engineers, and planners — is therefore essential for widespread adoption of resilient construction practices.
7. Toward Integrated Resilience Floods in South Sudan are not isolated environmental events; they are systemic challenges linked to climate variability, socioeconomic vulnerability, and weaknesses in built environments. To achieve resilient architectural outcomes: • • • •
Research and data collection on flood risk, hydrology, and soil behavior must inform design. Multidisciplinary collaboration between engineers, architects, planners, and communities is required to produce context-appropriate solutions. Capacity building at local and national levels will enable sustainable implementation of resilient architecture. Pilot projects that demonstrate effective resilient building techniques can catalyze broader adoption.
8. Conclusions South Sudan’s flood crisis is a multifaceted challenge with profound implications for architecture, infrastructure, and human settlements. Severe and recurrent flooding threatens homes, schools, healthcare facilities, and critical infrastructure, illustrating the urgent need for flood-responsive design. Resilient architectural strategies — including elevated structures,
robust materials, integrated drainage, and community-driven adaptations — are critical components of sustainable responses. These design approaches must be supported by policy frameworks, planning systems, and capacity building to create durable, resilient built environments. South Sudan’s resilience will depend not only on emergency responses but on forward-looking architectural and planning interventions capable of withstanding and adapting to the realities of a changing climate.