Emergence of Wetland Neighbourhoods in Port Harcourt and the Challenge to the Urban Planner

Abstract

Rapid urban expansion and land-use changes have increasingly encroached upon wetland ecosystems, leading to their degradation and loss, particularly in developing regions where planning control is limited. In cities like Port Harcourt, this has resulted in a transition from informal wetland settlements to more structured residential developments, raising critical concerns for sustainable urban planning and environmental management. This study examines the emergence and expansion of wetland neighbourhoods in Port Harcourt, focusing on their spatial patterns, socio-economic characteristics, underlying drivers, and implications for urban planning. Rapid urbanization, rising land values, and increasing housing costs within the formal urban core have intensified pressure on marginal lands, leading to settlement growth in environmentally sensitive wetland areas. A mixed-method approach was adopted, combining 131 structured questionnaires across six purposively selected neighbourhoods with field observations and geospatial analysis. Spatial techniques, including a distance matrix, were used to assess the relationship between settlement location and proximity to major road infrastructure. Findings reveal that wetland neighbourhoods are increasingly occupied by middle-income residents, indicating a transition from traditional low-income informal settlements to more hybrid development forms. Key drivers include housing affordability constraints, accessibility to transport corridors, availability of low-cost land, and weak development control mechanisms. Despite their accessibility, these neighbourhoods exhibit planning deficiencies such as irregular layouts, inadequate infrastructure, encroachment into drainage channels, and heightened flood vulnerability. The study concludes that wetland urbanization reflects structural housing and governance challenges and underscores the need for integrated, risk-sensitive planning approaches supported by geospatial technologies.