If it should have to be removed at some time in the future for instance to repair the roof membrane below its removal should not damage the historic building.
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.
Installing a green roof can also require major changes to a building.
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Many jurisdictions now require building owners to collect stormwater in infiltration basins that clean and slowly release the water back into the ground to help reduce the burden on the sewer systems green roofs help do this naturally without the need for special infiltration basins or equipment.
Research at penn state has shown that green roofs provide considerable reduction in the volume of stormwater leaving a developed site and they reduce the peak rates of runoff.