IWA Publishing

Six experimental modules were constructed at the green roof innovation testing laboratory (GRITLab) on the fifth-story roof of a building at the St. George Campus of the University of Toronto in Ontario, Canada. Each module has a drainage area of 2.88 m² (2.4 m × 1.2 m) and is elevated from the roof deck to a height of 0.8 m. Design characteristics of the six modules monitored and analyzed in the study are depicted in Table 1.

Table 1

Design characteristics of the six modules monitored and analyzed in the study

Module	Plant	Soil medium	Drainage layer	Orifice size in check dam
GR-FLL	Sedum	100 mm mineral (FLL-recommended) with 6.7% organic matter	32 mm	N/A
GR-organic	Sedum	100 mm highly organic with 25.6% organic matter	32 mm	N/A
BGR-FLL	Sedum	100 mm mineral (FLL-recommended) with 6.7% organic matter	85 mm (restricted to 55 mm)	N/A
BGR-organic	Sedum	100 mm mineral (FLL-recommended) with 6.7% organic matter	85 mm (restricted to 55 mm)	N/A
BR-2.4	Non-vegetated	N/A	N/A	2.4 mm
BR-4.8	Non-vegetated	N/A	N/A	4.8 mm

Module	Plant	Soil medium	Drainage layer	Orifice size in check dam
GR-FLL	Sedum	100 mm mineral (FLL-recommended) with 6.7% organic matter	32 mm	N/A
GR-organic	Sedum	100 mm highly organic with 25.6% organic matter	32 mm	N/A
BGR-FLL	Sedum	100 mm mineral (FLL-recommended) with 6.7% organic matter	85 mm (restricted to 55 mm)	N/A
BGR-organic	Sedum	100 mm mineral (FLL-recommended) with 6.7% organic matter	85 mm (restricted to 55 mm)	N/A
BR-2.4	Non-vegetated	N/A	N/A	2.4 mm
BR-4.8	Non-vegetated	N/A	N/A	4.8 mm

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