Design and Evaluation of a Rooftop Rainwater Harvesting System for an Institutional Building in Abuja, Nigeria

This repository contains a research article titled “Design and Evaluation of a Rooftop Rainwater Harvesting System for an Institutional Building in Abuja, Nigeria.” The study investigates the technical and economic feasibility of implementing rooftop rainwater harvesting systems as a supplementary water supply strategy in urban institutional environments. The research analyzes rainfall characteristics in Abuja, estimates rooftop runoff potential, and determines appropriate storage tank sizing using hydrological modeling and demand–supply balance methods. The performance of the proposed system is evaluated in terms of water supply contribution, storage reliability, and economic viability. Results indicate that rooftop rainwater harvesting can significantly reduce dependence on municipal water supply and groundwater extraction, particularly for non-potable uses such as toilet flushing, cleaning, and irrigation. The study highlights the environmental benefits of rainwater harvesting, including stormwater runoff reduction, urban flood mitigation, and groundwater conservation. Recommendations are provided for system design, policy integration, and future research. This work contributes to sustainable urban water management practices in developing countries and serves as a reference for engineers, policymakers, and researchers interested in decentralized water supply systems.