Tool to address green roof widespread implementation effect in flood characteristics for water management planning
In the last decades, new approaches were adopted to manage stormwater as close to its source as possible through technologies and devices that preserve and recreate natural landscape features. Green Roofs (GR) are examples of these devices that are also incentivized by city's stormwater man...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-06-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/370/217/2015/piahs-370-217-2015.pdf |
| Summary: | In the last decades, new approaches were adopted to manage stormwater as
close to its source as possible through technologies and devices that
preserve and recreate natural landscape features. Green Roofs (GR) are
examples of these devices that are also incentivized by city's stormwater
management plans. Several studies show that GR decreases on-site runoff from
impervious surfaces, however, the analysis of the effect of widespread
implementation of GR in the flood characteristics at the urban basin scale
in subtropical areas are little discussed, mainly because of the absence of
data. Thereby, this paper shows results related to the monitoring of an
extensive modular GR under subtropical weather conditions, the development
of a rainfall–runoff model based on the modified Curve Number (CN) and SCS
Triangular Unit Hydrograph (TUH) methods and the analysis of large-scale
impact of GR by modelling different basins. The model was calibrated against
observed data and showed that GR absorbed almost all the smaller storms and
reduced runoff even during the most intense rainfall. The overall CN was
estimated in 83 (consistent with available literature) with the shape of
hydrographs well reproduced. Large-scale modelling (in basins ranging from
0.03 ha to several square kilometers) showed that the widespread use of GRs
reduced peak flows (volumes) around 57% (48%) at source and 38%
(32%) at the basin scale. Thus, this research validated a tool for the
assessment of structural management measures (specifically GR) to address
changes in flood characteristics in the city's water management planning.
From the application of this model it was concluded that even if the
efficiency of GR decreases as the basin scale increase they still provide a
good option to cope with urbanization impact. |
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| ISSN: | 2199-8981 2199-899X |