Infraestructura verde como alternativa sustentable para reducir el riesgo hídrico en aéreas urbanizadas

Abstract

In this work the incidence of urban and peri-urban green spaces in the hydrodynamics for sub-basins of the city of Rosario is presented. A simple method for estimating an indicator, based on the runoff coefficient of the rational equation, which allowed quantify the magnitude of the impact of green areas in the runoff of each urban sub-basin, was applied. The runoff coefficient (C), corresponding to a given area is estimated by the use and kind of existing soil, following a wide bibliography. The soil classification was made using satellite images and field tasks, associating classes detected and runoff coefficients, defined for different types of coverage of urban and rural soils. A method is proposed to relate changes in the indicator, according to scenarios of land use, with modifications of flood risks. This relationship can detect that adequate increases of green surfaces, significantly reduce the risk of flooding in urban systems. In all three cases, a scenario that respects not developable areas and urban green spaces can evacuate future rainwater surpluses with the same existing infrastructure and to host major population.