2026-04-272026-04-272025-12-11https://repositorio.ifal.edu.br/handle/123456789/3014The growing demand for drinking water, combined with the irregularity of rainfall patterns and the pressure on water sources, highlights the need for solutions that promote the rational use of water resources. Among the available alternatives, rainwater harvesting stands out for reducing treated water consumption and mitigating environmental impacts associated with surface runoff in urban areas. In this context, this study aims to analyze the technical and economic feasibility of implementing a rainwater harvesting, treatment and reuse system in the Informatics Building of the Federal Institute of Alagoas (IFAL) – Maceió Campus, primarily intended for replenishing the institution’s swimming pool. The research was structured based on the collection and analysis of regional rainfall data, estimation of the swimming pool water demand, characterization of the roof catchment area and application of design parameters defined by standards. Based on these inputs, the storage volume was sized, first-flush diversion criteria were defined, implementation and operation costs were estimated and an economic feasibility analysis was carried out using engineering economy indicators such as Net Present Value (NPV), Internal Rate of Return (IRR) and payback period. The results show that the proposed system can supply approximately 17.02% of the annual pool demand, reducing potable water consumption from the public utility and yielding a positive NPV, an IRR higher than the minimum attractive rate and a payback shorter than one year, which characterizes the proposal as technically and economically feasible for the analyzed context.ptAttribution-NoDerivs 3.0 BrazilEngenharia CivilÁguas pluviais - AproveitamentoSustentabilidade hídricaPiscina - Ifal Maceió - Viabilidade econômicaRainwater harvestingWater sustainabilityPool - Ifal - swimmingTrabalho de Conclusão de CursoENGENHARIAS::ENGENHARIA CIVIL