Transition in urban stormwater management infrastructures: a landscape strategy for climage changing
DOI:
https://doi.org/10.11606/issn.2359-5361.v0i34p107-128Keywords:
Climate change. Urban drainage. Best Management Practices. São Paulo.Abstract
Global climate models regarding the predicted scenarios of Greenhouse Gases (GHG) emissions, forecast a general increase in intensity and frequency of extreme rainfalls. Advanced studies in regional and local scales attest this intensification with greater spatial and temporal precision. The increase in rainfall associated with urban sprawl and more impervious surfaces, will lead to unprecedented impacts on drainage infrastructures. Facing the need of adaption to this future scenario, cities have the opportunity to perform an infrastructural transition when adopting stormwater Best Management Practices (BMPs) as a sustainable, resilient and landscape friendly solution. This paper presents a qualitative and quantitative comparison between BMPs techniques and usual detention reservoirs as flow control strategies. Regarding a case study urban watershed in Greater São Paulo, where two reservoirs with total volume of 19.200 m3 were built, porous sidewalks and bioretention elements have been located in the contribution area within this basin. The retention volume of these proposed techniques considering their average porosity corresponds to 42% of the reservoirs capacity. It is then confirmed stormwater BMPs viability and suitability as alternatives to adapting cities to climate change, but their efficiency relies on a design that takes into account the specific local environment and landscape.
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