Aplicação de técnicas compensatórias de drenagem urbana sustentável associadas à intervenção da paisagem urbana em um estacionamento no Campus I da UFPB

Abstract

Starting from the sustainable and resilient cities planning, many problems arising from climate change and human actions can be solved or mitigated. For this, it is possible to make use of techniques, approaches or devices that resemble natural processes, in order to solve problems such as those caused by excess surface runoff. This research deals with the sustainable urban drainage devices insertion into an interdisciplinary way with the urban landscape intervention project. The study area corresponds to a part of the Center for Technology (CT) and a part of the Center of Renewable and Alternative Energies (CEAR) of the Federal University of Paraíba (UFPB). It was verified the behavior of infiltration structures in three different scenarios, based on a proposal of layout remodeling. On the first scenario infiltration trenches were adopted. On the second, permeable pavements were used with different covering types. For the third scenario both structures were used together. The development of the project was carried out using the Envelope Curve Method for the structures design and the Total Effective Cost Method was applied for the cost analysis, which considers the possible costs for the system entire life (planning, construction, maintenance, monitoring and deactivation). In addition to the structural dimensioning and costs the expected benefits were quantified subjectively, based on the weights available in the literature. With those data, the cost per area drained by the devices relation and what value is necessary to reduce the peak flow were analyzed and a cost-benefit analysis was established. It was observed that when proceeding with a complete evaluation the first scenario showed a peak flow reduction of 43%, for the second, 46% and for the third scenario the reduction was equivalent to 52% of the current peak flow of the study area. The price per square meter, the cost of the flow reduction and the cost-benefit ratio were more attractive in the scenario composed only by infiltration trenches. However, in all the scenarios, the peak flow was reduced when compared with the current scenario. Therefore, it is expected that adopting this type of structure leads to financial, environmental and social benefits.