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...

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Main Authors: R. Tassi, F. Lorenzini, D. G. Allasia
Format: Article
Language:English
Published: Copernicus Publications 2015-06-01
Series:Proceedings of the International Association of Hydrological Sciences
Online Access:https://www.proc-iahs.net/370/217/2015/piahs-370-217-2015.pdf
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spelling doaj-75591e40bbf4497980134f57163485ca2020-11-24T21:47:54ZengCopernicus PublicationsProceedings of the International Association of Hydrological Sciences2199-89812199-899X2015-06-0137021722210.5194/piahs-370-217-2015Tool to address green roof widespread implementation effect in flood characteristics for water management planningR. Tassi0F. Lorenzini1D. G. Allasia2Federal University of Santa Maria, Santa Maria, BrazilFederal University of Santa Maria, Santa Maria, BrazilFederal University of Santa Maria, Santa Maria, BrazilIn 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.https://www.proc-iahs.net/370/217/2015/piahs-370-217-2015.pdf
collection DOAJ
language English
format Article
sources DOAJ
author R. Tassi
F. Lorenzini
D. G. Allasia
spellingShingle R. Tassi
F. Lorenzini
D. G. Allasia
Tool to address green roof widespread implementation effect in flood characteristics for water management planning
Proceedings of the International Association of Hydrological Sciences
author_facet R. Tassi
F. Lorenzini
D. G. Allasia
author_sort R. Tassi
title Tool to address green roof widespread implementation effect in flood characteristics for water management planning
title_short Tool to address green roof widespread implementation effect in flood characteristics for water management planning
title_full Tool to address green roof widespread implementation effect in flood characteristics for water management planning
title_fullStr Tool to address green roof widespread implementation effect in flood characteristics for water management planning
title_full_unstemmed Tool to address green roof widespread implementation effect in flood characteristics for water management planning
title_sort tool to address green roof widespread implementation effect in flood characteristics for water management planning
publisher Copernicus Publications
series Proceedings of the International Association of Hydrological Sciences
issn 2199-8981
2199-899X
publishDate 2015-06-01
description 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.
url https://www.proc-iahs.net/370/217/2015/piahs-370-217-2015.pdf
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AT florenzini tooltoaddressgreenroofwidespreadimplementationeffectinfloodcharacteristicsforwatermanagementplanning
AT dgallasia tooltoaddressgreenroofwidespreadimplementationeffectinfloodcharacteristicsforwatermanagementplanning
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