Analysis of the technical-economic feasibility of rainwater harvesting systems (RWHS) and the influence on IPTU-Verde in a development of the popular housing program of Caixa Econômica Federal in the city of Limeira/SP

Abstract

ABSTRACT: The rainwater harvesting systems (RWHS) is an alternative to the water crisis, as it minimizes the demand for potable water, however the cost can restrict the implementation in social housing (HIS). Thus, it is important to evaluate the implementation of the RWHS in this housing typology, associated with incentive instruments for sustainable practices, such as IPTU–Verde (green tax). The objective of this work is to evaluate, through computational analysis, the implementation of a RWH and jointly the discount requirements foreseen in IPTU-Verde in the city of Limeira/SP in a development of buildings Range 3 dwellings of the Minha Casa, Minha Vida Program (Brazilian Housing Program). For the implementation of the RWH, were analyzed three scenarios, identifying the one that presented the greatest viability to the enterprise guidelines, which foresee the use of rainwater for watering gardens and washing common areas. The SAAP and other sustainability items provided for in the development resulted in a 50% discount on the IPTU-Verde, 10% for the RWHS. The estimated costs of implementing the system resulted in a ratio between the tax benefit of 85%, concluding the viability of implementing the RWH in the enterprise.