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If it works in cold climates it's an improvement
Even if this material does not stop the migration of pollutants to storm drains, et al it still provides the benefit of slowing the movement of water to the street and drainage systems, which in some ways makes up for the loss of trees (watershed), which would have that affect. Loss of trees and open expanses of earth through real-estate development have contributed to the increased speed of water making its way to drainage systems, which are being overwhelmed by the ever increasing volume of water in places like Pennsylvania, where this contributes to flooding. Pervious concrete and green roofs serve a similar goal in slowing the movement of rain water to drainage systems. This is why both technologies have been exhibited at the Philadelphia Flower Show for many years now.
Posted by PSFTGURU@...
3rd Nov 2011