The well-being of any nation is based on its readily available and functional infrastructure. The abandonment of urban infrastructure does become a threat and causes an environmental nuisance, slowing down development. The study assesses the impact of abandoned urban infrastructure on the environmental development of Ogun State. It examines the effects of abandonment on the environment and identifies the various causes and types of abandoned urban infrastructure in the state. Questionnaires and interviews were used to gather data from estate surveyors, valuers, and end users of urban infrastructure. The data was analyzed using a descriptive analysis and the Relative Importance Index (RII). The effects of abandoned urban infrastructure on environmental development were determined to be environmental degradation, a decrease in business activities, and an increase in health issues. The study recommends that infrastructural projects should be done in bits to avoid abandonment, ongoing construction should always be kept clean to avoid negatives uses, good health care and environmental cleaning up should be done for the people, and the use of turnkey projects as well as the globally established PPP model of infrastructure delivery.

The study analyze waterfront regeneration in Niger Delta and the problems bedeviling regeneration of the waterfront settlements in Port Harcourt, with an objective of ascertaining the socio economic, land use and physical development characteristics of the waterfronts. It also identifies constraints militating against effective regeneration of the waterfront settlements and examines how effective were past efforts in addressing the problems of waterfront has been. Data were gathered from owners of buildings and heads of households in the various selected waterfront settlements using Cluster sampling to group the settlements based on their location while simple random sampling technique was used to select seven waterfront settlements with the use of questionnaire and personal interview. Data were analyzed using simple frequency counts and percentages for the research questions. Findings reveals that the major constraint to waterfront regeneration was the fear of losing their houses, and failure of successive Governments to fulfill their promises, the preferred approaches for regeneration were transformation, complete clearance and revitalisation respectively. The study therefore suggest that Government should create a special purpose entity that will be responsible for the regeneration of the various waterfront settlements, the community should fully be involved in any regeneration project from the inception to the completion of the project and the government should draw up development plans with timelines for regenerating each settlement.