Two Green Roof Detention Models Applied in Two Green Roof Systems
Publication: Journal of Hydrologic Engineering
Volume 27, Issue 2
Abstract
A two-stage physically-based detention model has been developed for green roof systems. Vertical flow in the substrate is represented by the Richards equation, and horizontal flow in the underlying drainage layer is modeled by the Saint Venant equation. This two-stage physically-based model (2SPB) and the stormwater management model (SWMM) green roof low impact development control model (SWMM-GR) were validated using measured runoff profiles from two contrasting green roof systems: a conventional green roof system; and an innovative system intended to enhance detention. The substrate and drainage layer model parameters were identified from independent physical tests. The 2SPB model provides a reasonable estimation of runoff profiles from a conventional green roof system. However, the model is not capable of representing the flow conditions in the innovative green roof system’s detention layer, such that model results were less accurate for this system compared with the conventional green roof system. SWMM-GR model results for the conventional system were less representative of its overall detention performance due to the assumptions inherent in the substrate percolation model.
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Data Availability Statement
The experimental data for the conventional green roof system and the code for the physically-based model are available in a repository or online in accordance with funder data retention policies (https://doi.org/10.15131/shef.data.16583852). The experimental data from the innovative green roof system were provided by a third party (Green Roof Diagnostics). Direct requests for these materials may be made to the provider as indicated in the Acknowledgments.
Acknowledgments
Zhangjie Peng is supported by the University of Sheffield, Faculty of Engineering Doctoral Academy Award. The authors would like to thank Dr. Gianni Vesuviano for the detention test data with the FD-25 drainage layer and the conventional green roof system. The authors would also like to thank Derek Hidalgo and Scott Jeffers at Green Roof Diagnostics for their contributions in obtaining and analyzing the experimental data from the innovative green roof system.
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Published In
Journal of Hydrologic Engineering
Volume 27 • Issue 2 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Mar 4, 2021
Accepted: Oct 29, 2021
Published online: Dec 14, 2021
Published in print: Feb 1, 2022
Discussion open until: May 14, 2022
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