Green Roof Infiltration

Green roofs are unique in that they have the ability to capture and retain a volume depth of rain from each rainstorm.

Green roof infiltration.

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. 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. 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. Integrate practices into your treatment drains to mitigate stormwater impacts including.

In fact a green roof replicates the natural landscape allowing water to infiltrate the vegetation substrates and engineered drainage layers of the green roof. Green roofs can help reduce energy costsfor a building by acting as another layer of insulation between the inside and outside of the roof. Use practices that do not require infiltration. This captured water is then evapotranspired back to the atmosphere through the green roof vegetation.

Rainwater harvesting green roofs vegetated swales and.