title: A two-stage storage routing model for green roof runoff detention.
abstract: Green roofs have been adopted in urban drainage systems to control the total quantity and volumetric flow rate of runoff. Modern green roof designs are multi-layered, their main components being vegetation, substrate and, in almost all cases, a separate drainage layer. Most current hydrological models of green roofs combine the modelling of the separate layers into a single process; these models have limited predictive capability for roofs not sharing the same design. An adaptable, generic, two-stage model for a system consisting of a granular substrate over a hard plastic 'egg box'-style drainage layer and fibrous protection mat is presented. The substrate and drainage layer/protection mat are modelled separately by previously verified sub-models. Controlled storm events are applied to a green roof system in a rainfall simulator. The time-series modelled runoff is compared to the monitored runoff for each storm event. The modelled runoff profiles are accurate (mean Rt(2) = 0.971), but further characterization of the substrate component is required for the model to be generically applicable to other roof configurations with different substrate.
authors.affiliation: The University of Sheffield, Department of Civil and Structural Engineering, Mappin Street, Sheffield, S1 3JD, UK E-mail: gianni.vesuviano@gmail.com.
authors.forename: Gianni
authors.initials: G
authors.lastname: Vesuviano
authors.affiliation: The University of Sheffield, Department of Civil and Structural Engineering, Mappin Street, Sheffield, S1 3JD, UK E-mail: gianni.vesuviano@gmail.com.
authors.forename: Fred
authors.initials: F
authors.lastname: Sonnenwald
authors.affiliation: The University of Sheffield, Department of Civil and Structural Engineering, Mappin Street, Sheffield, S1 3JD, UK E-mail: gianni.vesuviano@gmail.com.
authors.forename: Virginia
authors.initials: V
authors.lastname: Stovin
mesh_terms: D003247:Conservation of Natural Resources; D004323:Drainage, Sanitary; D005160:Facility Design and Construction; D011891:Rain