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Hydrologic Performance of an Extensive Green Roof under Intense Rain Events: Results from a Rain-Chamber Simulation

Author

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  • Elena Giacomello

    (Department of Architecture and Arts, Iuav University of Venice, 30135 Venice, Italy)

  • Jacopo Gaspari

    (Department of Architecture, University of Bologna, 47521 Cesena, Italy)

Abstract

The water storage capacity of a green roof generates several benefits for the building conterminous environment. The hydrologic performance is conventionally expressed by the runoff coefficient, according to international standards and guidelines. The runoff coefficient is a dimensionless number and defines the water retention performance over a long period. At the scale of single rain events, characterized by varying intensity and duration, the reaction of the green roof is scarcely investigated. The purpose of this study is to highlight how an extensive green roof—having a supposed minimum water performance, compared to an intensive one—responds to real and repetitive rain events, simulated in a rain chamber with controlled rain and runoff data. The experiment provides, through cumulative curve graphs, the behavior of the green roof sample during four rainy days. The simulated rain events are based on a statistical study (summarized in the paper) of 25 years of rain data for a specific location in North Italy characterized by an average rain/year of 1100 mm. The results prove the active response of the substrate, although thin and mineral, and quick draining, in terms of water retention and detention during intense rain events. The study raises questions about how to better express the water performance of green roofs.

Suggested Citation

  • Elena Giacomello & Jacopo Gaspari, 2021. "Hydrologic Performance of an Extensive Green Roof under Intense Rain Events: Results from a Rain-Chamber Simulation," Sustainability, MDPI, vol. 13(6), pages 1-23, March.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:6:p:3078-:d:514987
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    References listed on IDEAS

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    1. Sonja Knapp & Sebastian Schmauck & Andreas Zehnsdorf, 2019. "Biodiversity Impact of Green Roofs and Constructed Wetlands as Progressive Eco-Technologies in Urban Areas," Sustainability, MDPI, vol. 11(20), pages 1-26, October.
    2. Mario Maiolo & Behrouz Pirouz & Roberto Bruno & Stefania Anna Palermo & Natale Arcuri & Patrizia Piro, 2020. "The Role of the Extensive Green Roofs on Decreasing Building Energy Consumption in the Mediterranean Climate," Sustainability, MDPI, vol. 12(1), pages 1-13, January.
    3. Yujiro Hirano & Tomohiko Ihara & Kei Gomi & Tsuyoshi Fujita, 2019. "Simulation-Based Evaluation of the Effect of Green Roofs in Office Building Districts on Mitigating the Urban Heat Island Effect and Reducing CO 2 Emissions," Sustainability, MDPI, vol. 11(7), pages 1-16, April.
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    Cited by:

    1. Katya Coelho & João Almeida & Fernando Castro & André Ribeiro & Tiago Teixeira & Paulo Palha & Nuno Simões, 2022. "Experimental Characterisation of Different Ecological Substrates for Use in Green Roof Systems," Sustainability, MDPI, vol. 15(1), pages 1-18, December.
    2. Yu Chen & Jacopo Gaspari, 2023. "Exploring an Integrated System for Urban Stormwater Management: A Systematic Literature Review of Solutions at Building and District Scales," Sustainability, MDPI, vol. 15(13), pages 1-16, June.

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