The effects of multilayer blue-green roof on the runoff water quality
In the context of climate changes, characterized by an increase of short but intense rainfall events and rise of the average temperature, the fast population growth and consequent urbanization require the implementation of innovative solutions to mitigate pluvial floods and, at the same time, reduce...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Heliyon |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023091740 |
| _version_ | 1797429770350231552 |
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| author | Elena Cristiano Alessandra Carucci Martina Piredda Emma Dessì Salvatore Urru Roberto Deidda Francesco Viola |
| author_facet | Elena Cristiano Alessandra Carucci Martina Piredda Emma Dessì Salvatore Urru Roberto Deidda Francesco Viola |
| author_sort | Elena Cristiano |
| collection | DOAJ |
| description | In the context of climate changes, characterized by an increase of short but intense rainfall events and rise of the average temperature, the fast population growth and consequent urbanization require the implementation of innovative solutions to mitigate pluvial floods and, at the same time, reduce the water demand. Among the different nature-based solutions, multilayer blue-green roofs have been widely recognized for their high capacity of reducing runoff generation from rooftops, and their additional storage layer enables to collect water, which could be reused for different purposes. However, the quality of the collected water in a multilayer blue-green roof and the influence that the additional storage layer has on it have not been analysed yet. Following this knowledge gap, we investigated the potential benefits of a multilayer blue-green roof installed in Cagliari, with respect to a traditional roof. The outflow triggered by artificial irrigation and natural rainfall events was analysed, both from a quantitative and qualitative perspective. Results confirm the high contribution of multilayer blue-green roofs in mitigating runoff generation, which is however influenced by antecedent soil moisture and water level conditions. The outflow from the multilayer blue-green roof presents lower suspended solids and heavy metals concentrations than from a traditional roof. On the other hand, Carbon Oxigen Demand (COD) concentrations in the multilayer blue-green roof outflow exceed the limits defined by the Italian regulations (125 mg/l) for water discharge or reuse, partially due to the high residence time in the storage layer. Specific treatments could be planned to reuse the collected water for urban purposes. |
| first_indexed | 2024-03-09T09:17:56Z |
| format | Article |
| id | doaj.art-8d12ce8dbd164e6cb2673e44bc05bbb2 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-09T09:17:56Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-8d12ce8dbd164e6cb2673e44bc05bbb22023-12-02T07:04:47ZengElsevierHeliyon2405-84402023-11-01911e21966The effects of multilayer blue-green roof on the runoff water qualityElena Cristiano0Alessandra Carucci1Martina Piredda2Emma Dessì3Salvatore Urru4Roberto Deidda5Francesco Viola6Corresponding author. Department of Civil-Environmental Engineering and Architecture, University of Cagliari, Via Marengo 2, 09123, Cagliari, Italy.; Department of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, CA, ItalyDepartment of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, CA, ItalyDepartment of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, CA, ItalyDepartment of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, CA, ItalyDepartment of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, CA, ItalyDepartment of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, CA, ItalyDepartment of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, CA, ItalyIn the context of climate changes, characterized by an increase of short but intense rainfall events and rise of the average temperature, the fast population growth and consequent urbanization require the implementation of innovative solutions to mitigate pluvial floods and, at the same time, reduce the water demand. Among the different nature-based solutions, multilayer blue-green roofs have been widely recognized for their high capacity of reducing runoff generation from rooftops, and their additional storage layer enables to collect water, which could be reused for different purposes. However, the quality of the collected water in a multilayer blue-green roof and the influence that the additional storage layer has on it have not been analysed yet. Following this knowledge gap, we investigated the potential benefits of a multilayer blue-green roof installed in Cagliari, with respect to a traditional roof. The outflow triggered by artificial irrigation and natural rainfall events was analysed, both from a quantitative and qualitative perspective. Results confirm the high contribution of multilayer blue-green roofs in mitigating runoff generation, which is however influenced by antecedent soil moisture and water level conditions. The outflow from the multilayer blue-green roof presents lower suspended solids and heavy metals concentrations than from a traditional roof. On the other hand, Carbon Oxigen Demand (COD) concentrations in the multilayer blue-green roof outflow exceed the limits defined by the Italian regulations (125 mg/l) for water discharge or reuse, partially due to the high residence time in the storage layer. Specific treatments could be planned to reuse the collected water for urban purposes.http://www.sciencedirect.com/science/article/pii/S2405844023091740Multilayer blue-green roofWater qualityWater reuseSustainable urban developmentRunoff mitigation |
| spellingShingle | Elena Cristiano Alessandra Carucci Martina Piredda Emma Dessì Salvatore Urru Roberto Deidda Francesco Viola The effects of multilayer blue-green roof on the runoff water quality Heliyon Multilayer blue-green roof Water quality Water reuse Sustainable urban development Runoff mitigation |
| title | The effects of multilayer blue-green roof on the runoff water quality |
| title_full | The effects of multilayer blue-green roof on the runoff water quality |
| title_fullStr | The effects of multilayer blue-green roof on the runoff water quality |
| title_full_unstemmed | The effects of multilayer blue-green roof on the runoff water quality |
| title_short | The effects of multilayer blue-green roof on the runoff water quality |
| title_sort | effects of multilayer blue green roof on the runoff water quality |
| topic | Multilayer blue-green roof Water quality Water reuse Sustainable urban development Runoff mitigation |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023091740 |
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