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dc.contributor.authorSchärer, Lotte Askeland
dc.contributor.authorBusklein, Jan Ove
dc.contributor.authorSivertsen, Edvard
dc.contributor.authorMuthanna, Tone Merete
dc.date.accessioned2020-05-13T12:11:22Z
dc.date.available2020-05-13T12:11:22Z
dc.date.created2020-04-14T08:38:33Z
dc.date.issued2020
dc.identifier.citationHydrology Research. 2020, 51 (2), 339-350.en_US
dc.identifier.issn1998-9563
dc.identifier.urihttps://hdl.handle.net/11250/2654262
dc.description.abstractClimate change combined with urbanization increases the performance demand on urban drainage systems. Green roofs are one of the most used green infrastructure measures to alleviate the pressure on the urban drainage system through the detention and retention of runoff. The rational method with the runoff coefficient (C) is one of the most commonly used design tools for stormwater design in Norway. This method relies on a runoff coefficient being available for green roofs, which is typically not the case. This paper compares laboratory and experimental field studies to investigate runoff coefficients from different types of detention-based roofs. The methodology described in the German ‘FLL Guideline’, one of the world's most commonly used green roof standards, was used to measure the runoff coefficients for the different components making up a typical green roof. The contribution from each layer is reflected in the runoff coefficients. The runoff coefficients from the field experiments were calculated using observed precipitation and runoff from existing green roofs in Oslo, Trondheim, Sandnes, and Bergen, Norway. Events that had a cumulative precipitation comparable to the laboratory events, but longer durations, were selected. These events gave significantly lower and varying runoff coefficients, clearly demonstrating the limitation of choosing a suitable runoff coefficient for a given roof. However, laboratory experiments are important in understanding the underlying flow processes in the different layers in a detention-based roof.en_US
dc.language.isoengen_US
dc.publisherIWA Publishingen_US
dc.rightsNavngivelse-DelPåSammeVilkår 4.0 Internasjonal*
dc.rightsNavngivelse-Ikkekommersiell-DelPåSammeVilkår 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/deed.no*
dc.titleLimitations in using runoff coefficients for green and gray roof designen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber339-350en_US
dc.source.volume51en_US
dc.source.journalHydrology Researchen_US
dc.source.issue2en_US
dc.identifier.doi10.2166/nh.2020.049
dc.identifier.cristin1806014
dc.relation.projectNorges forskningsråd: 237859en_US
dc.description.localcodeThis is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY-NC-SA 4.0), which permits copying, adaptation and redistribution for non-commercial purposes, provided the contribution is distributed under the same licence as the original, and the original work is properly cited (http://creativecommons.org/licenses/bync-sa/4.0/).en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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