ÁREA VERDE MÍNIMA PARA LOTEAMENTOS SUSTENTÁVEIS SEGUNDO O CICLO HIDROLÓGICO

Abstract

Sustainable urban development faces, nowadays, all sorts of challenges from mankind’s actions such as urban biodiversity conservation, promotion of healthy living and maintenance of environmental quality. Green areas offer many potentials to win these challenges because they help maintaining the hydrologic local cycle. In this context, this research studied some scenes that worked as a mark to seek the ideal percentage to a minimum green area in an allotment, in order to allow it to become sustainable, concerning its hydrologic local cycle. It is necessary to point out that some green areas, such as the permanent ones, area already mandatory by the environmental Brazilian laws. However, some situations, like allotments in urban areas, demand a percentage of green area smaller than the minimum necessary, which leads to bad consequences towards its citizens: floods, overflow, landslides, etc. So, intending to achieve its research goals, a research based on Delphi method was realized, questioning specialists about what the ideal minimum green area percentage value would be in order to have sustainable allotments. The result of its method points out that it is considered to be necessary at least 25 % of green area. After that, in order to check environmental impact from the suggested percentage in an existing allotment, that value was projected in a case study and its application impacts were quantified, either by its decreased building area or its permeable area gain. Keywords: green area, hydrological local cycle, sustainable allotment, land use, urban area sustainability.