Análise das viabilidades técnica e econômica da implantação de um sistema de aproveitamento de água pluvial no Instituto Federal de Goiás – Câmpus Goiânia

Abstract

In order to alleviate the impacts of the disorderly growths of cities and of the population on the use of water and to reduce the costs of drinking water consumption, the present work analyzes the technical and economic feasibility of the implementation of a Pluvial Water Supply System (SPAAP) in buildings that belong to the Federal Institute of Goiás - Campus Goiânia. It can be verified from similar studies that this type of system is very efficient in most cases, usually reducing the usage of drinking water by values above 30%, but the investment for the implementation of a SPAAP should be analyzed and its financial viability must be proven so it can be of interest to investors. In order to analyze the feasibility of the investment, a prior design of the system and a quantitative of all the costs and savings generated by the implementation of the proposed SPAAP are necessary. Three buildings were chosen as the place of implementation in which are included classrooms, a library, an auditorium and the central administration of the institution. The choice criteria of the place of implementation were mainly the technical feasibility conditions, the area of coverage and the quantity of sanitary appliances that would be supplied by rainwater. For a lifespan of 20 years, a

roof area of 2260,79 square meters and supplying rainwater to ten restrooms, the proposed system was proven to be technically and economically viable, requiring a storage tank of ten cubic meters and presenting R$ 253.416,58 of net present value with a payback time of 6 years and 8 months.