Analysis of the economic feasibility of using rainwater for vertical residential type buildings in the City of João Pessoa State of Paraíba

• Autor(a) principal: Martins, Byanca Evelly dos Santos
• Data de Publicação: 2021
• Outros Autores: Menezes, Lenore Karla Medeiros, Farto, Cindy Deina, Athayde Junior, Gilson Barbosa
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Research, Society and Development
• Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/17655
• topic: Rainwater harvesting systems; Economic analysis; Net present value; Cost-benefit ratio.; Sistemas de captación de agua de lluvia; Análisis Economico; Valor presente neto; Relación beneficio-costo.; Sistemas de aproveitamento de água da chuva; Análise Econômica; Valor Presente Líquido; Relação benefício-custo.

The objective of this study is to analyze the economic feasibility of implementing a rainwater catchment system to serve non-potable uses in vertical residential buildings in the city of João Pessoa, state of Paraíba, Brazil, and assess the willingness of the city's population to pay a higher price for a property that has this rainwater catchment system. The first hypothesis considers a variation in the number of floors, ranging from 5 to 30. The second hypothesis considers a variation in the reservoir volume. The volumes considered and tested were 15m³, 25m³, 45m³ and 65m³. Thus, 104 scenarios were created. To verify the population's interest in rainwater harvesting systems and the willingness to pay extra for these systems, a survey was carried out via google forms, for about 70 people. Overall, 79.8% of the scenarios have B/C greater than 1. To the 15m³ reservoir, which presented a greater economic attractiveness, 92.31% of the alternative scenarios B/C greater than 1. The 65m³ reservoir has only 65.38% of the B/C values greater than 1. The best performance was achieved for the scenario of 21 floors and 15m³ reservoir, with the B/C of 1.96, NPV of R$24,446.92 and payback period in 9.3 years. The application of the forms revealed that 96.6% of the population is interested in acquiring a property with the development system and that 57.1% are willing to pay up to 2% more than the property's value.