Análise da viabilidade econômica de sistemas sustentáveis de drenagem urbana no município de Itaituba - PA

Abstract

Unbridled urbanization leads to complex problems for urban drainage during rainy periods, which can cause flooding, flooding and other environmental and socioeconomic consequences. Sustainable Urban Drainage Systems (SUDS) present themselves as a promising alternative to mitigate these problems, as they promote the infiltration of rainwater into the soil, contribute to landscaping, reduce pollution and improve quality of life. In this sense, this study analyzed the economic viability for the use of these systems in the municipality of Itaituba, Pará. The city, which is currently undergoing urban expansion, has been presenting, during the Amazon winter, successive episodes of flooding in several strategic points of urban mobility, such as the Transamazônica Highway. The research was carried out in two stages: 1. Identification and selection of sustainable urban drainage systems, where the use of rain gardens and infiltration trenches were considered, highlighting their technical characteristics and evaluating adaptability to the local reality; 2. Assessment of the costs of implementing these systems, which considered the materials, labor and equipment necessary to implement the techniques. The results indicated that rain gardens with greater retention capacity are more expensive to implement, while gardens with lower retention capacity are more economical, however, with a smaller percentage of reduction in the volume of water that would be destined for the drainage system. Infiltration trenches, in general, are more economical when constructed mechanically. The cost difference between manual excavation and mechanized excavation is significant, and can offset the additional cost of equipment and labor required for mechanized excavation. The PET bottle infiltration trench is significantly cheaper than the conventional infiltration trench, but the construction costs become more expensive to build than the conventional infiltration trench. However, it may be more economically viable in the long term, due to lower maintenance costs and greater environmental benefits.