Conclusions and perspectives
Green roof implementation appears to significantly reduce urban runoff in terms of peak discharge and volume:
These impacts depend on the temporal distribution of precipitation and the initial state of the substrate saturation.
The implementation of green roof could be useful to avoid some flooding issues in several cases depending on the initial conditions
Combined with other stormwater source controls, green roof could participate to significantly reduce the quantity of water flowing into the sewage network
Multi-Hydro platform is still in progress...
Its distributed structure enables to analyse the impact of the spatial variability of the land use, and especially the precise location of green roof.
It can also been used to take into account the spatial distribution of rainfall and assess its impact on stormwater management.
The implementation of a more physical model to represent green roof behaviour represents an interesting track development to test different green roof configuration differentiating by their substrate porosity and thickness, plant species, drainage system...
