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In the last decades, new approaches were adopted to manage stormwater as\udclose to its source as possible through technologies and devices that\udpreserve and recreate natural landscape features. Green Roofs (GR) are\udexamples of these devices that are also incentivized by city's stormwater\udmanagement plans. Several studies show that GR decreases on-site runoff from\udimpervious surfaces, however, the analysis of the effect of widespread\udimplementation of GR in the flood characteristics at the urban basin scale\udin subtropical areas are little discussed, mainly because of the absence of\uddata. Thereby, this paper shows results related to the monitoring of an\udextensive modular GR under subtropical weather conditions, the development\udof a rainfall–runoff model based on the modified Curve Number (CN) and SCS\udTriangular Unit Hydrograph (TUH) methods and the analysis of large-scale\udimpact of GR by modelling different basins. The model was calibrated against\udobserved data and showed that GR absorbed almost all the smaller storms and\udreduced runoff even during the most intense rainfall. The overall CN was\udestimated in 83 (consistent with available literature) with the shape of\udhydrographs well reproduced. Large-scale modelling (in basins ranging from\ud0.03 ha to several square kilometers) showed that the widespread use of GRs\udreduced peak flows (volumes) around 57% (48%) at source and 38%\ud(32%) at the basin scale. Thus, this research validated a tool for the\udassessment of structural management measures (specifically GR) to address\udchanges in flood characteristics in the city's water management planning.\udFrom the application of this model it was concluded that even if the\udefficiency of GR decreases as the basin scale increase they still provide a\udgood option to cope with urbanization impact

Tool to address green roof widespread implementation effect in flood characteristics for water management planning