Green Roof Infiltration

Use practices that do not require infiltration.

Green roof infiltration.

This captured water is then evapotranspired back to the atmosphere through the green roof vegetation. This is most noticeable in intensive green roofs since there is a thicker and more consistent layer of soil which provides a higher insulating value. Integrate practices into your treatment drains to mitigate stormwater impacts including. Integrating a green roof into a historic building rehabilitation project may appear to be an easy solution to reducing the urban heat island effect improving storm water management and improving the energy efficiency and sustainability of the building.

Other practices designed for decreasing peak flow that do not require soils with high infiltration rates. The minimum thickness of the green roof growing medium must be calculated as follows where the impervious roof area to green roof area ratio is less. Rainwater harvesting green roofs vegetated swales and. Green roofs are unique in that they have the ability to capture and retain a volume depth of rain from each rainstorm.

Impervious roof areas that direct runoff onto the green roof cannot exceed 50 of the green roof area which is equivalent to a maximum hydraulic impervious runoff loading ratio of 0 5 1.