Artificial rainfall experiments for green roofs depending on the flow length at 0 % and 2 % slope and different rain intensities

Artificial rainfall experiments for green roofs depending on the flow length at 0 % and 2 % slope and different rain intensities

The irrigation experiments presented in the database are part of an extensive series of experiments. The experiments took place in 2015, 2019 and 2020 and were carried out according to the investigation methods for vegetation substrates and drainage layer fill materials for green roofs, Appendix B.4 of the FLL Green Roof Guidelines (2008 and 2018). Measurements with flow lengths >5m were performed following the measurement method (only the flow length was changed). The 2015 surveys were conducted at a 0% slope, while those in 2019 and 2020 were conducted at a 2% slope. They showe extreme runoff delay with increasing flow length. The data series here include water levels (reference Water Levels database) and irrigation and runoff values (reference Irrigation Runoff database) for the first 30 minutes after the beginning of irrigation. Water levels were photographed using cameras in the substrate and measured by hand, depending on elevation.

The measurements include the saturated setups in triplicate (setups A7, A8 and A9). The equipment and materials are described in more detail in the following article and the associated supplement:

Förster, K., Westerholt, D., Kraft, P., & Lösken, G. (2021): Unprecedented retention capabilities of extensive green roofs – New design approaches and an open-source model (under review).

The data of this repository is also used for numerical modelling:

Kristian Förster, & Philipp Kraft. (2021, March 25). GreenRoof - A physically-based flow model for green roofs (Version 1.0). Zenodo. http://doi.org/10.5281/zenodo.4635675

The following setups were analysed and simulated in the article:

2015: 2015-11a to 2015-24

2019: 2019-27 to 2019-44 (excluding 2019-31, 2019-35 and 2019-36)

2020: 2020-46 to 2020-62 (excluding 2020-50, 2020-55 and 2020-59).

Downloads:

Tables.pdf: The complete measurement setups, Measurements 2015, 2019 and 2020

Readme.pdf: Notes on the test series

runoff.csv

water_level_in_substrate.csv

Author Contributions

Field campaign: DW, supervision of study: GL.

Funding

This research was funded by the Leibniz Universität Hannover. Parts of the 2015 campaign (experiments until February 2015) were funded by Fachvereinigung Bauwerksbegrünung (FBB), today Bundesverband Gebäudegrün (BUGG, German Association of Building Greening).

Acknowledgement:

We would like to thank several people who contributed to the success of this study. Firstly, the help of the student assistants and the administrative employees at the Institute of Landscape Architecture is greatly acknowledged: Sophie Beeskow, Laura Hahn, Marius Janning, Mira Ruben (2015 campaign); Pia von Buttlar, Sophie Lange, Sina Mewes, Mira Ruben, Jelle Schacht, Gabriele Steinmeyer, Paul Struß (2019/2020 campaign). Jonathan Westerholt developed the software for reading the camera recordings and helped to convert the data, which is greatly acknowledged. We wish to thank Larissa van der Laan for helping improve the English of the description.