Trends in the design, construction and operation of green roofs to improve the rainwater quality. State of the art

[EN] The green roofs appear as technology for the improvement water quality. This article identifies trends in the conditions of design, construction and operation of green roofs, which aim is to improve the quality of rainwater. A literature review was carried out in order to collect 45 original research papers from databases as Scopus, Science Direct, and Redalyc. From the information collected trends in increments and reductions in the concentrations of the main water quality parameters, seasons of the year with the best results, types of green roofs , types of substrate and most common components, construction trends (dimensions, inclination, Materials and layers) and vegetation used in these systems have been determined. The results show that green roofs have the ability to neutralize acid rain. Extensive type roofs are the ones most commonly used, due to its characteristics of construction, functionality and low maintenance requirements[ES] Los techos verdes se presentan como tecnología de mejoramiento de calidad de agua. En este artículo se identifican tendencias en las condiciones de diseño, construcción y operación de techos verdes cuyo objetivo es mejorar la calidad del agua lluvia. Se realizó una revisión bibliográfica consultando en las bases de datos Scopus, Science Direct y Redalyc, un total de 45 artículos científicos originales. A partir de la información recolectada se identificaron tendenciasen incrementos y reducciones en las concentraciones de diferentes parámetrosde calidad de agua, temporadas del año con los mejores resultados, tipos de techos verdesmás usados, clases de sustratoy componentes más comunes, tendencias de construcción (dimensiones, inclinación, materiales y capas) y vegetación más usada. 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