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Green and blue infrastructure (GBI) is an urban planning approach that can reduce and mitigate the impacts of urbanization in the water cycle. This study evaluates the hydrologic impacts of a possible deployment of GBI in a peri-urban catchment under pressure from urban development. Considering cost-effectiveness, the best combinations of GBI techniques were simulated and compared with a scenario with urban expansion. A hydrological model in SWMM was applied to simulate impacts of GBI in runoff and a Hec-RAS model to assess the impact on flood. A combination of lot areas treated by rooftop disconnection and roads treated by vegetative swales achieved the lowest cost and one of the highest effectiveness in runoff reduction. Despite the growth of impervious area by almost 100% from urban expansion, the GBI scenario would bring the hydrological conditions and total flooded area downstream closer to the current scenario ones.

Hydrological response of implementing green and blue infrastructure – study of a Brazilian metropolis