Rain gardens: green infrastructure typology for the Santos, SP

Graciana Goes Almeida, Paulo Eduardo de Oliveira Andrade, Orlando Carlos Damin, Mara Angelina Galvão Magenta

Abstract


Currently, the development of big cities has been characterized by a great number of constructions, the total paving of streets and beyond the priority given to the automobile as opposed to the human being. Those factors contribute to the impermeability of the soil, thus influencing directly on the water route. As a mitigating measure, there is a possibility to insert elements which may help pluvial drainage, besides enhancing the beauty of the urban landscape. Those elements are known as typologies of spaces which are treated landscape projects and are applied as part of a green infrastructure network. Facing the need to present new proposals which provide greater support to sustainability, this paper aims to evaluate the typology of Rain Garden, which contribute to the removal pollutants, with the infiltration and retention of water volumes precipitated in the city of Santos. That city was chosen because for the past few years it has been affected by the construction of a large number of buildings, as well as permeable areas. As the region usually has a considerable pluviometric index, flooding is likely to occur in certain spots. For this study we have performed an experiment simulation, using a plastic box with a perforated base, with an area of ​​0,104 m², containing the background a geotextile blanket and substrates of sand and organic soil. The results showed that in the worst storm conditions (150 L/m²/h); it is possible to obtain system water retention of about 20%. These numbers allow the indication of planting 10 native plant species compatible with requirements.

 

Keywords: green infrastructure. rain garden. native species. urban ecology. sustainable garden;


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