Análise da viabilidade financeira de implementação de sistema de captação de água pluvial: um estudo de caso

Abstract

The growing concern with sustainability and efficient management of natural resources has driven the search for ecological solutions in construction. Among these alternatives, rainwater harvesting stands out as a promising practice for reducing drinking water consumption and mitigating problems related to water scarcity. This study aims to analyze the financial viability of implementing a rainwater collection system in a single-family residence located in Cascavel, Paraná, based on its execution cost. The research adopted an exploratory quantitative approach, based on regional rainfall data, residential water consumption and technical standards for sizing hydraulic systems. Calculations were carried out to determine the volume of the necessary reservoir, sizing of the pipes and projection of costs and savings generated. The analysis considered the return on investment period to evaluate the economic efficiency of the system, highlighting the relevance of sustainable practices in civil construction. Due to the significant initial investment and the long payback period, it was found that the implementation of the rainwater collection system is not financially advantageous, with a return on investment period of 22 years. Even assuming that this building would still be built, the payback period would remain high, taking approximately 18 years. Therefore, for this residence, the implementation of a rainwater collection system is not financially recommended. Although the financial results do not provide returns in the short or medium term, it is essential to take into account the economic and environmental issues involving water, as this is a scarce resource.