Análise técnica e econômica do dimensionamento de reservatórios de águas pluviais para fins não potáveis em condomínio vertical e horizontal

Abstract

Rainwater harvesting systems are sustainable alternatives that collaborate with the rational use of water in the urban environment. Thus, the objective of this study was to evaluate technically and economically the hydraulic structure's implementation for the use of rainwater in two types of apartment complexes in Lavras - MG, Brazil, one vertical and the other horizontal, comparing the technical differences between them. The precipitation historical series of the municipality was prepared, and with that, it was possible to estimate the monthly volume of usable rainwater. Then, the pipelines system and the water intake and conduction structures were designed, using the standards NBR 10844 (ABNT, 1989) and NBR 5626 (ABNT, 1998). Still, the demand for non-potable water was calculated and thus, the volume of the lower and upper reservoirs was determined. Lower reservoir volumes were calculated by the Rippl, Brazilian Practical and Simulation Methods, all presented by NBR 15527 (ABNT, 2007). Finally, the budget composition was performed, and the technical and economic analysis was performed using the Discounted Payback Method. It was identified that for the vertical condominium, the Brazilian Practical Method is the most appropriate, while for the horizontal condominium, the most convenient calculation model is the Simulation Method. In addition, it was found that the systems implemented are considered long-term investments, however, enable better management of water resources.