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.
CORE (COnnecting REpositories)
CORE (COnnecting REpositories)