Modelling green roof stormwater response for different soil depths

Castiglia Feitosa, R; Wilkinson, S

Modelling green roof stormwater response for different soil depths

Castiglia Feitosa, R Wilkinson, S

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Publication Type:: Journal Article
Citation:: Landscape and Urban Planning, 2016, 153 pp. 170 - 179
Issue Date:: 2016-09-01

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Field	Value	Language
dc.contributor.author	Castiglia Feitosa, R	en_US
dc.contributor.author	Wilkinson, S https://orcid.org/0000-0001-9266-1858	en_US
dc.date.available	2020-05-25T19:22:05Z
dc.date.issued	2016-09-01	en_US
dc.identifier.citation	Landscape and Urban Planning, 2016, 153 pp. 170 - 179	en_US
dc.identifier.issn	0169-2046	en_US
dc.identifier.uri	http://hdl.handle.net/10453/66057
dc.description.abstract	© 2016 Elsevier B.V. Green roofs have been proposed as a way to mitigate stormwater run-off in urban areas due to the possibility of retrofit to existing buildings. The amount of run-off is influenced by the, humidity, evapotranspiration, as well as soil type and depth. A modelling approach was undertaken to evaluate the response of different soil depths to cumulative rainfall and the efficiency in stormwater flow rate attenuation. The soil hydraulics were modelled using HYDRUS-1D software developed for modelling water flow in variably saturated porous media. Model runs were carried out for three quarterly scenarios to determine run-off peak flow rates and the overall retention, based on evapotranspiration rates of succulent plants and rainfall registers from Auckland, New Zealand. The soil depths modelled ranged from 5 to 160 cm. The efficiencies in peak flow attenuation by the shallowest soil considered were reduced under extreme and longer rainfall events by 3%. Therefore shallow soil or extensive green roofs may, on a wide scale, overcome the performance of deep soils due to their lighter weight which adds limited loads to existing roof structures thereby making them suited to retrofit greater numbers of buildings.	en_US
dc.relation.ispartof	Landscape and Urban Planning	en_US
dc.relation.isbasedon	10.1016/j.landurbplan.2016.05.007	en_US
dc.subject.classification	Urban & Regional Planning	en_US
dc.title	Modelling green roof stormwater response for different soil depths	en_US
dc.type	Journal Article
utslib.citation.volume	153	en_US
utslib.for	1202 Building	en_US
utslib.for	1205 Urban and Regional Planning	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	09 Engineering	en_US
utslib.for	12 Built Environment and Design	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/e-Press
pubs.organisational-group	/University of Technology Sydney/Faculty of Design, Architecture and Building
pubs.organisational-group	/University of Technology Sydney/Faculty of Design, Architecture and Building/School of Built Environment
pubs.organisational-group	/University of Technology Sydney/Strength - CCDP - Contemporary Design Practice
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	153	en_US

Abstract:

© 2016 Elsevier B.V. Green roofs have been proposed as a way to mitigate stormwater run-off in urban areas due to the possibility of retrofit to existing buildings. The amount of run-off is influenced by the, humidity, evapotranspiration, as well as soil type and depth. A modelling approach was undertaken to evaluate the response of different soil depths to cumulative rainfall and the efficiency in stormwater flow rate attenuation. The soil hydraulics were modelled using HYDRUS-1D software developed for modelling water flow in variably saturated porous media. Model runs were carried out for three quarterly scenarios to determine run-off peak flow rates and the overall retention, based on evapotranspiration rates of succulent plants and rainfall registers from Auckland, New Zealand. The soil depths modelled ranged from 5 to 160 cm. The efficiencies in peak flow attenuation by the shallowest soil considered were reduced under extreme and longer rainfall events by 3%. Therefore shallow soil or extensive green roofs may, on a wide scale, overcome the performance of deep soils due to their lighter weight which adds limited loads to existing roof structures thereby making them suited to retrofit greater numbers of buildings.

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http://hdl.handle.net/10453/66057