The recovery sustainable urban water systems management and Green Roofs. Widespread conversion of impervious surfaces existing greened surfaces in urban areas

The conversion of impervious surfaces in greened surfaces can reduce adjustment of sewer systems problem, reducing the overload produced by events of downpour, improving urban water systems management. The feasibility in existing building depends on the extent of the new applied loads. In order to check the endurance of green roofs in Mediterranean climate (Rieti -inner central Italy), in real conditions, with only 80 mm of substrate, an experimental roof has been set up . A reference roof and two kinds of green roofs has been built up on a laboratory roof. Measures are conducted in natural weather. A first set of measures is showed, providing the performance of accumulation and drainage layers. Moreover a qualitative analysis of planted vegetation growth is provided.